Is Tons of Jade 8o8 Corn Suitable for Planting in Huanghuai Area?

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Brief introduction of corn

Alias bonzi, Hosta, corn, corn

Corn belongs to the genus Zea in Gramineae, and its scientific name is Zea. Corn, commonly known as cob, corn and corn, originated in Mexico and Peru along the Andes in Latin America. After Columbus discovered America, he brought corn to Spain on his second return trip (1499). With the development of the world navigation industry, corn has gradually spread to all parts of the world and become one of the most important food crops. Corn is known as longevity food, which is rich in protein, fat, vitamins, trace elements, cellulose and polysaccharides, and has great potential to develop foods with high nutrition and high biological function.

Corn is not only the main source of human food, but also a popular health food, which often appears on the dining table and is very popular in Europe and America, once famous for its delicious food. It is reported that former US President Ronald Reagan used to eat cornflakes porridge for breakfast every morning.

Corn injection is a common food crop, mainly produced in the north. There are yellow corn and white corn, among which yellow corn contains more vitamin A, which is very beneficial to people's eyesight. Its nutritional value exceeds that of flour and rice, and it can prevent arteriosclerosis, cardiovascular and cerebrovascular diseases, cancer, hypercholesterolemia, hypertension and other diseases if eaten regularly.

Corn is the seed of Gramineae herb corn. The origin is Mexico or Central America. Corn was discovered in Cuba on 1492 (1 1 piece) and has been planted all over North and South America since then. After being brought back to Spain in 1494, corn gradually spread all over the world. By the end of the Ming Dynasty, corn was planted in Jilin, Henan, Shandong, Zhejiang, Fujian, Yunnan, Guangdong, Guangxi, Guizhou, Sichuan, Shaanxi, Gansu, Hebei, Anhui and Xinjiang. Harvest ripe fruits in summer and autumn, thresh and dry the seeds, or use them fresh.

2065438+04-February 2004 The forecast of the market competition pattern of wheat and corn in China shows that in the second half of the year, the trend of wheat and corn will be stronger and weaker, with short-term demand boosting and medium-term supply depressing prices. In the second half of the year, the average price of wheat was 2465 yuan/ton, down 3.0% from the first half. The average price of corn in the second half of the year was 2475 yuan/ton, up 8.8% from the first half.

In the first half of the year, domestic wheat prices continued to fall, with a fluctuation range of 2440-2580 yuan/ton, with an average price of 254 1 yuan/ton, up 2.6% year-on-year. Affected by temporary purchasing and storage, domestic corn rose significantly in the second quarter, with a fluctuation range of 2215-2,400 yuan/ton, with an average price of 2,275 yuan/ton, down 0.5% year-on-year.

The wheat harvest in the second half of the year is a foregone conclusion, supported by the storage price. According to the statistics of the Ministry of Agriculture, the summer grain production in the national reclamation areas has achieved another bumper harvest this year, in which the sown area of wheat crops is 6.382 million mu, up 8.3% year-on-year, and the total output is 2.547 million tons, up 65.438+06.2% year-on-year. In the second half of the year, with the listing of new wheat and the rotation of old wheat reserves, the increase of supply will gradually suppress the price. On the demand side, the demand for flour is light, the factory delivery is not smooth, the purchasing enthusiasm is not high, and most of them are used correctly. However, in the third quarter, the market was entrusted to start purchasing and storage in advance, the demand for grain depot replenishment and the demand for wheat feed replacement brought about by the falling prices of wheat and corn boosted the price of wheat in the short term. Generally speaking, in the second half of the year, the wheat price was near strong and far weak, and sought support above the lowest purchasing and storage price after 20 14Q3.

It is difficult to change the pattern of oversupply of corn in dry weather. In the first half of the year, corn harvest reached a new high, and the decrease of surplus grain in the market led to tight supply in the third quarter; At the same time, under the situation that the drought in Henan, Shandong and other major Huanghuai producing areas leads to the expected reduction of production, the price of corn has increased greatly. However, at present, the temporary storage inventory is more than 90 million tons, and the inventory digestion pressure is huge.

plant morphology

When maize blooms and heads, it is an annual cereal plant of Gramineae and Zea mays, which is native to North America, Central America and South America. The plants are tall and the stems are strong and straight. The leaves are narrow and large, with wavy edges and alternate on both sides of the stem. Androgyny, the male spike is terminal. Female flowers are axillary, mature into spikes with thick central axis, and the spikelets develop into two rows of grains after being paired. The ear of grain is wrapped in layers of deformed leaves, which is called foreskin. Seeds are edible. The chromosome number of somatic cells in diploid maize plants is 10 pairs. Therefore, the number of columns of corn is generally even.

Commodity grades are mainly divided according to the texture of seeds, including horse teeth, hard seeds, silty seeds, bursting seeds, waxy corn, sweet corn and so on. The depression of grain top is caused by the unequal dryness of hard starch and soft starch in grain. Hard corn contains less soft starch, and the top does not sag after drying. Silty corn mainly contains soft starch, which is silty and fragile. Sweet corn is wrinkled and transparent, and sugar is not converted into starch. Popcorn is an extreme type of hard corn with small and hard grains and no soft starch. When heated, the water in the cells expands and the grain bursts. Crossing with excellent inbred lines can improve maize types. Corn is used as feed, food and industrial raw materials, which is the main food in many areas, but its nutritional value is lower than other cereals, and its protein content is also low, and it lacks nicotinic acid. If corn is the staple food, it is prone to pellagra. The protein of corn is too low to be used for bread. In Latin America, corn is widely used as unfermented tortillas.

In fact, although the nutritional value of corn is lower than other cereals, isomaltooligosaccharides can be extracted from corn. Isomaltooligosaccharide is the best among prebiotics, and prebiotics are the food of probiotics, which is closely related to the reproduction of probiotics in human body, so as to achieve the balance of intestinal flora and make the intestine healthy.

In addition to grain, corn is also the main raw material for industrial alcohol and shochu. There are many ways to treat seeds: wet grinding method is to soak seeds in dilute sulfurous acid solution for 40 ~ 60 hours; Dry grinding method is to wet seeds with spray or steam for a short time; Fermentation is to convert starch into sugar, and then add yeast to convert sugar into alcohol. Other parts of the plant are also widely used: corn stalk is used for paper making and wallboard manufacturing; Bracts can be used as filling materials and straw weaving; Corn cob can be used as fuel and industrial solvent, and stems and leaves are not only used as livestock feed, but also as good raw materials for biogas digesters.

The root of corn is fibrous root, and besides radicle, node roots grow from stem nodes: those that grow from underground node roots are called underground node roots, generally 4-7 layers; Nodal roots that grow from aboveground stem nodes are also called supporting roots and aerial roots, and generally have 2 ~ 3 layers. Plant height 1 ~ 4.5m, and the stem is cylindrical. The whole plant generally has 15 ~ 22 leaves, which are wide and long and often wavy. Flowers are unisexual and monoecious. Male peanuts are panicles at the top of plants; The female flower is born in the leaf axil in the middle of the plant and is a spike. Generally speaking, the male spike blooms 3-5 days earlier than the female filament.

Maize introduction

Brief introduction of corn

Alias bonzi, Hosta, corn, corn

Corn injection is a common food crop, mainly produced in the north. There are yellow corn and white corn, among which yellow corn contains more vitamin A, which is very beneficial to people's eyesight. [2] Its nutritional value exceeds that of flour and rice. Regular consumption can prevent arteriosclerosis, cardiovascular and cerebrovascular diseases, cancer, hypercholesterolemia, hypertension and other diseases. [3]

abstract

2065438+04-February 2004 The forecast of the market competition pattern of wheat and corn in China shows that in the second half of the year, the trend of wheat and corn is strong and weak, with short-term demand boosting and medium-term supply depressing prices. In the second half of the year, the average price of wheat was 2465 yuan/ton, down 3.0% from the first half. The average price of corn in the second half of the year was 2475 yuan/ton, up 8.8% from the first half.

Folding corn

The explanation is jade sorghum. Its seedlings and leaves are like corn. They grow very thick, and the seedlings are three or four feet high. In June and July, flowers blossomed into spikes, and there were grains of rice on the bracts, which gathered together one by one. The colors are yellow and white.

Sweet, flat and non-toxic.

Efficacy is mainly used to treat urinary leakage and urinary calculi with unbearable pain. Soak in the soup several times.

market quotation

[4] China began to implement the temporary purchasing and storage policy in 2008, and it has been 7 years since then. Except for the quantity of purchasing and storage in 2008, there is no upper limit for acquisitions at other times. Looking at the data below, there is a big gap in the purchase amount of temporary storage corn from year to year, and the purchase price of temporary storage corn has also increased. The purchase price of 20 12-20 13 temporary storage corn reached the highest point in recent years, 2100-2,240 yuan/ton. The rising price of corn also promoted the purchase of corn, which directly led to a huge corn stock. 20 12-20 13, temporary storage of corn * * purchased 30.83 million tons of corn, plus 7,065,438+million tons this year, which was carried forward to 201-201in 2007-2008. In 20 14, the total output of corn was only 220 million tons, and the number of temporarily stored corn accounted for 50% of the total output.

This development trend will bring the following impacts to the future corn market:

1, corn price rises, farmers' feeding costs increase, and the aquaculture industry is sluggish.

2. The number of traders has decreased. Most of the corn purchased in Northeast China this year was sold to China Grain Reserve, and the local surplus grain was less than 10%, which greatly reduced the local corn trade.

3. Enterprises have no food to collect, especially the source of high-quality food is limited. Except for a few large state-owned enterprises, many small corn processing enterprises, including feed and deep processing enterprises, have difficulties in production and operation and are facing the situation of stopping production.

4. The lag of the auction of State Reserve can't adjust the market demand in time, which leads to the shortage of domestic corn supply and destroys the normal relationship between market supply and demand.

Artificial cultivation

Corn likes temperature, and the optimum temperature for seed germination is 25 ~ 30℃. The daily average jointing period is above 65438 08℃. The average daily temperature from heading to flowering is 26 ~ 27℃.

Corn can grow on sandy soil, loam and clay. The suitable soil pH value of maize is 5 ~ 8, and the optimum pH value is 6.5 ~ 7.0. Salt and alkali tolerance is poor, especially chloride ion is harmful to corn.

Wet corn can produce carcinogen aflatoxin, which is not suitable for eating.

Planting technique

Corn is a high-yield crop and needs a lot of fertilizer. Only reasonable fertilization can meet the nutrient demand of maize in the whole growth period. Spraying a new type of high-fat film greatly improved the effective component rate of fertilization. According to the experiment, the production of 100 kg corn seeds requires 2.5 kg nitrogen, 2.5 kg phosphorus 1 kg potassium. If you produce 500 kilograms of corn per mu, you need about 33 kilograms of urea per mu, or 50 kilograms of ammonium nitrate, 3 1 kg of calcium superphosphate and 0/3 kilograms of potassium sulfate/kloc-0.

In the three stages of maize growth, the proportion of fertilizer requirement is different, which accounts for 2% of the total fertilizer requirement at seedling stage, 85% at ear stage and 13% at grain stage. The peak period of maize fertilizer demand is from jointing stage to full mouth stage, so reasonable fertilization should be achieved when fertilizing, that is, the combination of base fertilizer, seed fertilizer and topdressing; Combined application of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer; Combine agricultural fertilizer, chemical fertilizer and biological bacterial fertilizer, and spray Zhuangsuiling to increase the 1000-grain weight of corn. Sufficient base fertilizer should be applied, which is the foundation. Generally, 2000 kg of decomposed organic fertilizer, 7.5 kg of phosphorus pentoxide and 5.5 kg of potassium fertilizer are applied per mu as base fertilizer.

In the plots with low application level of base fertilizer and seed fertilizer and poor soil fertility conditions, topdressing can be carried out at the 6 ~ 7 leaf stage of corn, with topdressing urea of about 15 kg per mu and deep application of more than 15 cm to improve the utilization rate of chemical fertilizers; Base fertilizer and seed fertilizer are applied to high-level plots, and the amount of topdressing urea per mu is about 10 kg.

Top dressing of corn should be carried out as soon as possible. The first method is topdressing in front and ploughing in the back. Topdressing and ploughing should be combined. The second is to dig a hole with a pick, chasing more than 15 cm; When topdressing, chemical fertilizer and biological fertilizer should be used together to promote the good development of root system. In general, topdressing urea 10 ~ 15 kg per mu, and adding biological bacterial fertilizer 1 kg can promote the early maturity of corn.

Spraying 0.25 kg of potassium dihydrogen phosphate and 0.5 kg of urea with 50 kg of water at heading and filling stages can prevent baldness and grain loss, increase yield and improve quality. Organic food corn can't use chemical fertilizer. It is best to use fermented organic fertilizer as base fertilizer and cake fertilizer as topdressing. The fertilizer effect is stable and lasting, the effect is better than that of chemical fertilizer, and the stamina is long However, when topdressing, the cake fertilizer should keep a proper distance from the crop seedlings to avoid the heat generated during the fermentation of the cake fertilizer from burning the seedlings.

Emasculation treatment: When planting corn in a large area, after the tassels of corn are extracted, the tassels of corn are alternately extracted, which can reduce the consumption of nutrients and improve the yield.

Folding pest control

There are more than 30 species, mainly including leaf spot, head smut, bacterial wilt, virus disease, stem rot and so on. Prevention can be achieved by selecting disease-resistant varieties and strengthening management. Pests include corn borer, cutworm, mole cricket, red spider, sorghum borer and armyworm.

Maize leaf spot, maize leaf spot, maize leaf spot, maize borer, maize borer, maize virus disease, maize smut, maize smut, maize stem rot, maize rust, maize anthracnose, maize powdery mildew, maize dwarf mosaic, maize common mosaic and maize stripe virus.

Loss degree of folding danger

Occurrence: The occurrence area of maize ear rot in Zhuanglang County varies with the planting area and year of susceptible varieties. In 2003, the incidence area was 3500hm2, and the rate of diseased ears was 46%. In 2004, the incidence area was 3000 hm2, and the rate of diseased ears was 26.5%. In 2005, the incidence area was 4500 hm2, and the disease ear rate was 44.3%. In 2006, the incidence area was 5300 hm2, and the disease ear rate was 23.9%.

Harmfulness: the diseased seeds are dark brown or reddish brown, the weight of 100 seeds is reduced by more than 1/2, and the quality is deteriorated. People and animals will cause toxic reactions after eating [5]. Experimental observation: when 20% of diseased seeds are mixed into the raw grain, people will have bitter taste and sour taste, and if they eat too much, they will have symptoms such as weakness of limbs, fever, nausea, vomiting, abdominal distension, abdominal pain and dizziness. When horses, mules, donkeys, pigs and other domestic animals are raised, they have diarrhea, refuse to eat and grow slowly. After feeding, the feed intake of sheep and chickens decreased, and the laying rate of hens decreased. The raw grain contains diseased grains, the commodity value decreases by 0.2-0.4 yuan/kg, the seeds contain diseased grains, and the sowing amount increases by 1 times.

Loss degree: In order to measure the economic loss caused by ear rot, Shen Dan 10 was classified according to ear size and incidence degree, and the diseased ear was divided into five grades. The panicle length, grain weight (w) of diseased panicle and healthy grain weight (y) of diseased panicle were measured, and the loss rate of each grade (%) = [(w-y)/w] ×. The calculation results show that the loss rate of 0, 1.2.3.4 after ear injury is 0, 18.4%, 27.3%, 45.0% and 68.2% respectively.

Symptom: Corn ear rot can occur in the field from seedling stage to mature stage. The most typical symptoms are seed mildew, weak seedlings, stem rot and ear rot, among which the economic loss of ear rot is the most serious:

Seed mildew and weak seedlings: germ pollution adheres to the surface of seeds. Serious injury after sowing can not germinate and rot, resulting in lack of seedlings and broken ridges; Light seedlings grow thin and slow after emergence, forming weak seedlings.

Ear rot: At the initial stage of reinfection in the field, the filaments of the ear are dark brown and soaked, and the top of the ear axis and seeds turn yellow-brown, pink or dark brown, extending to 1/3- 1/2 of the ear, and can be extended to all ears when it is rainy or wet. The diseased seeds have a gray-white or reddish mold layer on the surface, white flocculent or velvet-like, soft spikes, dark brown spikes, pale yellow or pink pith, and rupture to expose vascular tissue.

Stem rot usually occurs from the filling stage of corn, and the peak period is from milk ripening to wax ripening. Pathogens invade from roots and spread in plants. There is an irregular brown injury extending longitudinally between the first and second nodes of the diseased stem. After cutting the stem, the internal tissue is decomposed, the vascular bundle is free and filiform, and the stem becomes soft and easy to fall. The primary roots and secondary roots of most diseased plants turned red and the fibrous roots decreased. When the conditions are suitable, the disease develops rapidly, and the aboveground parts can't get water, which leads to the sudden death of the whole plant and the gray-green leaves, especially in sunny days after rain, wilting and bacterial wilt are more obvious. Therefore, this disease is also called bacterial wilt.

Basis and methods of prevention

(1) The aggravation of this disease in recent years is closely related to the poor disease resistance of some breeding materials and the change of cultivation conditions. Therefore, selecting disease-resistant inbred lines and cultivating disease-resistant hybrids are the primary control measures.

(2) Pathogens causing stem rot are all weak parasites, which can infect plants with weak growth potential. Strengthening cultivation management, rational fertilization, rational close planting and reducing soil moisture can make plants robust and reduce stem rot.

(3) Reasonable crop rotation, deep ploughing, clearing the sick and disabled, and not applying immature organic fertilizer can reduce the source of bacteria in the field and achieve a certain control effect.

Pathogen: Through microscopic examination of different parts of diseased corn ears collected in Zhuanglang County, the pathogen was separated and examined by the method of fungus separation and culture [5]. 9], a typical conidia of Fusarium was found. Compared with the related literature, it was identified as [1-8], which belongs to the genera of semi-fungi, Ascomycetes, Fusarium and Fusarium graminearum, and belongs to Ascomycetes, Gallus and Gibberella in sexual stage.

Pathogenic law: Pathogenic bacteria can invade and harm corn from seedling stage to seed storage period, and mildew loss occurs during ear harvest and air drying. Pathogens attach to diseased plants such as seeds, corn roots, stems and cob through mycelium, conidia or ascospores, and rot and overwinter. Under the rainy and humid conditions in the second year, the ascospores matured and flew away, landed on the parasitic corn filaments, and then invaded the cob and seeds through the filaments, causing ear rot. The occurrence of ear rot is affected by many factors, such as varieties, climate, the harm of corn borer, agricultural activities, storage conditions of ears (raw grain, seeds) and so on. corn

There are great differences in disease resistance among maize varieties: Zhongdan No.2, Jiudan No.4 and Jiudan No.2 planted in Zhuanglang County have strong disease resistance, and the diseased ear rate is 0-3%, while Shen Dan 10 (combination Q126/Shen 137) and Shen Dan/kloc-0. It was observed that the susceptible variety "Qingganshu" had many filaments in the ear, long and thick bracts, compact grain arrangement, high water content in the ear axis and slow water loss. However, the disease-resistant varieties have few filaments in the ear, thin bracts and exposed seeds at the top, which droop before harvesting after maturity and are not easy to rain in. In addition, the incidence of 2.3 panicles was significantly higher than that of 1 panicle, and the degree of incidence was high and the loss was also great.

Rainfall and rainy days in September-June 65438+1October are the key to the disease: during and after corn harvest, farmers can't harvest the ear in time and peel it and dry it in the sun, which provides good humidity conditions for the occurrence and development of the pathogen. Incidence degree (Y) and rainfall in Shen Dan 10 from September to June, 2005. P0.0 1=0.874, which shows that there is a very significant correlation between x and y.

Temperature conditions are suitable for the growth and development of the pathogen: according to the data [2.4-5], the growth and development temperature of wheat scab is 4-32℃, and the relative humidity of air is 80%- 100%. Conidia can be produced at about 8℃ with suitable humidity conditions, and the production speed is the fastest at 25℃, and the germination speed is extremely slow below 4℃, at least 1d is needed. The lowest temperature for the formation of ascospores is 9-65438 00℃, the temperature range for the germination of ascospores is 4-35℃, and the optimum temperature is 25-30℃. In Zhuanglang County, 9: 00- 1 1: 00 is the period from corn ripening to ear drying. During this period, the average temperature every ten days is 12.6-6.5℃, which can meet the growth and development of pathogenic bacteria. If the ears are piled together, the heat generated by breathing is more conducive to the reinfection of bacteria and the expansion of the disease.

The plots damaged by corn borer have serious diseases: it is found in the investigation that ear rot and stem rot occur simultaneously in all fruit ears or fruit stems damaged by corn borer, resulting in great economic losses. According to statistical analysis, the incidence of ear rot (%), Y and the plant rate of corn borer (%), X have a power function curve relationship y=axb [12]. 13], y disease = 1.37 12x0.9549 worm, f = 323.82 * * & gtf0.01=10.04, and the regression relationship is extremely significant; The incidence of ear rot of corn borer (%) before and after control was tested by t, t = 5.589 * * & gtdf 0.01= 3.106. This is because the feces discharged by the corn borer pollute the stems and shafts, which provides a favorable place for the breeding of germs.

According to the investigation, the incidence rate of Shen Dan 16 1 ear planted with plastic film was 18.5%, and the incidence rate of the second ear was 3 1.3%, which were lower than those in the open field16.5438+0.19 respectively. The incidence of Shen Dan 1 0 before "Grain Rain" was 2 1.7%, which was 2 1.6 percentage points lower than that after "Long Summer". It is believed that the reason for the low incidence rate is that plastic film mulching and timely early sowing can make corn mature ahead of time and reduce the ear axis and grain water content of susceptible varieties.

Folding prevention measures

The initial infection source of maize ear rot is wide, and humidity is the key. Therefore, comprehensive control measures must be based on agricultural measures, make full use of drug-resistant varieties, improve storage conditions, and combine pesticide irrigation with pesticide spraying protection.

Select disease-resistant parents (seed production) or varieties.

It is suggested that scientific research units and seed production enterprises should choose parents and combinations with excellent resistance to ear rot, establish disease-free seed production bases and cultivate healthy seeds. At the same time, county seed companies and agricultural technology centers should focus on the resistance to the disease in the introduction test of new corn varieties, and varieties with poor resistance should not be introduced; Zhuanglang county should actively introduce new varieties with high yield and disease resistance, such as Dandan 2, Jiudan 2 and Jiudan 4, on the basis of popularizing disease-resistant varieties.

Plastic film mulching, suitable for early sowing.

Full or semi-mulching with plastic film and early sowing in time can make corn mature early, reduce the water content of ear axis and grain of susceptible varieties, and effectively reduce bacterial infection during harvest and storage.

Peel off the bracts in time to prevent rain and moisture.

The harvest time of corn is generally autumn rain, and the harvested ears should not be piled too thick. Bracts should be peeled off as soon as possible and hung in a ventilated and sunny place to dry. Ears that can't be strung together should be thinned and dried, and turned frequently to prevent heat from getting sick. If it rains, cover it in time to prevent it from raining. Break the rotten top of the diseased ear to prevent the ear rot from spreading again.

In the process of stripping bracts, the moldy top of diseased ears should be removed at the junction of diseased and healthy areas to prevent further spread of diseases and increase losses. According to the experimental observation, the rotting length of the top of the ear was extended from 3cm to 7 cm after 3 days of rain without peeling the bracts. In the early stage of threshing, ear rot will expand from 5cm to15 cm; If the bud leaves are peeled off, the moldy part at the top of the diseased ear will not be removed. The rotten part of the ear is not completely removed, and the ear rot will expand by 2-5 cm in the early stage of threshing; And if it is thoroughly cleaned, there will be no ear rot.

Early threshing and mildew prevention

Pick out the diseased ear after harvest, thresh it as soon as possible, and dry it in the sun or in the pit to prevent the seeds from being further infected by germs.

Treating corn stalks to reduce the source of primary infection.

The accumulation of corn stalks, cob and stubble is a favorable place for Fusarium and corn borer to overwinter. Therefore, corn stalks, cob and stubble must be thoroughly treated in time by feeding (livestock), ammonifying (ammonifying forage), crushing (feeding pigs), retting (as fertilizer or biogas filler) and burning (cooking in into the pit), so as to reduce the primary infection source of pests and diseases.

Seed selection coating

Because the survival time of maize seed surface pathogen is longer than 1a [5], the production and business operation units should carefully select seeds, eliminate minor disease seeds and use 20% Fu? G seed coating agent coating [14], the dosage per 100kg seed is 444.4-800g, or more than 30%? g？ The dosage of Fu seed coating agent is 2 14-300 g per 100kg seed.

Folding chemical control

At the corn trumpet stage, 5 kg of river sand with a diameter of about 2mm was washed, stirred evenly with 20% fenvalerate 8- 10ml and 50% carbendazim WP50g to make granules, and poured 60-75 kg/hm ~ 2 into the gap between the center of corn heart leaves and 4-5 leaves that make up the heart leaf cluster to avoid dew condensation and application when rolling leaves. According to the experiment, the prevention and treatment effect of heart irrigation not only reached 6544. At the same time, the fruit was treated with 50% carbendazim WP 1000 times solution before corn harvest15 days.