Attach a little professional information:
There are many kinds of diseases and insect pests on jujube trees, among which "four pests and one disease" are the most common and the most harmful, that is, jujube pots,
Doing a good job in the prevention and control of "four pests and one disease" is to improve the quality of jujube.
Jujube yield is an important technical measure to improve jujube fruit quality.
First, the jujube inchworm, also known as jujube step, is the main leaf-eating pest of jujube trees. 1 generation occurs in 1 year.
The pupa overwinters in the soil layer 6- 10 cm deep under the tree, and the adult begins to emerge in the middle and late March of the following year, with the peak period of 4.
When jujube trees germinated in the middle of last month and the middle and late April, the larvae began to hatch. May is the worst.
Prevention and control methods:
1. Before overwintering pupae emerge in winter or early spring, dig 10 cm from the trunk.
Soil layer, dig out and kill the overwintering pupa.
2, stop killing female moths According to the habit that female moths have no wings and must lay eggs along the trunk, female moths emerged in the first half of March.
Before melting, tie a plastic film belt with a width of 10- 15 cm at the base of the trunk, tie both ends tightly, and bury the lower end in the soil.
Digging a circular ditch around the trunk and extracting 2.5% trichlorfon powder can poison female moths and newly hatched larvae.
You can also coat the plastic film belt with engine oil or insect-proof glue.
Chemical control before 3.3 years old, spraying 50% dichlorvos or parathion 1000 times, or 20% killing pyrethroids 300.
0 times.
Second, jujube gall midge, also known as jujube bud maggot, harms the buds and young leaves of jujube trees. This kind of insect occurs early, with many generations and great harm.
Long period has a great influence on the development of seedlings and young trees and the fruit of trees, and it is one of the main leaf pests of jujube trees. should
In North China 1 year, 5-7 generations occur, the mature larvae cocoon in the soil for the winter, and the adults emerge in April of the following year.
Eggs, the first half of May is the peak of damage.
Prevention and control methods:
1, ground spraying with 5% trichlorfon powder or 25% phoxim 1000 times solution, combined with the garden, eliminated.
Overwintering insect
2. Spray "1605" and "1500" times on the tree crown when the larvae occur or when there is no fruit, and spray 40% omethoate in the fruit.
Fruit 1000 times kills larvae.
Third, jujube tree armyworm, also known as jujube leaf roller, eats jujube leaves, jujube flowers and fruits with larvae, and can eat fruits attached to leaves.
, leading to fruit drop, which has a great impact on yield. The insect overwinters in the crack of jujube tree trunk bark as pupa from mid-March to mid-March.
Overwintering pupae began to emerge in late April. Occurrence period of each generation of larvae: the first generation of larvae bites from mid-April to late June.
Eat tender buds and leaves; The second generation larvae, from mid-June to early August, damage the flowers, leaves and young fruits of jujube trees; Third generation children
Insects do great harm to leaves from late July to 65438+1mid-October, and then eat fruits. Adults lurk during the day and move at night, black.
The light has a strong directivity.
Prevention and control methods:
L, artificial prevention and control in winter, scraping off the rough skin of the trunk, eliminating the overwintering pupae, and collecting the larvae of each generation on the trunk before pupation.
Electrify the sokcho, lure the larvae, and then weed and burn them.
2. The key to chemical control is to control the incubation period of each generation of larvae, especially the first generation of larvae.
Prevention and treatment, because this generation happens more neatly, and the effect of drug prevention and treatment is better. Dosage: 50% chlorpyrifos 10.
00-2000 times, 2.5% deltamethrin 4000 times, 20% deltamethrin 3000 times, or 80% dichlorvos 1500 times.
, spraying requirements detailed, uniform and thoughtful. In addition, 2000 pairs of 50% parathion were sprayed during the early spring adult occurrence period.
Both adults and eggs have killing effects.
3, light trapping can be set in the orchard to trap and kill adults.
4. The peach moth, jujube maggot, is widespread, with a fruit-setting rate of 50%-70%, which seriously affects the yield.
And quality. 1 year has two generations in Hebei province, and the mature larvae overwinter in the soil layer around the trunk 10-l5cm.
It will be unearthed in the middle of June and August next year, which is closely related to rainfall. Rain will be unearthed early and fruits will be eaten when they are in full bloom.
The end of the month to the middle and late August.
Prevention and control methods:
L. Eliminate overwintering larvae, dig overwintering cocoons in winter and spring, or cultivate overwintering cocoons with the thickness of 10- 15cm around rhizomes.
Pile up the soil and tamp it firmly to prevent emerging adults from being unearthed.
2. Chemical control uses sex pheromones to make predictions. When 3-4 insects are attracted every day, the number of female adults is large.
When there is a peak, spray chemicals 3-4 days after the peak. Effective agent: metronidazole or pyrethroid insecticide 3000-5000.
Once every 15 days.
5. Jujube rust, commonly known as jujube fog, mainly harms leaves. When the disease is serious, it will cause early defoliation and make jujube fruit.
Shrinking, reducing sugar content, and then weakening the tree potential, affecting yield and quality. The disease occurs in the middle and late July every year.
It reached its peak in August and September and began to shed leaves. In July and August, it was hot and rainy, and the incidence was serious, and the drought year was light; land
The jujube forest with low potential, dense planting and closed crown is seriously ill, with high terrain and good ventilation.
Prevention and control methods:
L, agricultural prevention and control winter defoliation, centralized incineration, reduce the source of germs; Planting dense jujube trees to
Prune too dense branches to facilitate ventilation and light transmission and enhance tree potential; Drainage in time in rainy season, to prevent excessive water, resulting in
Cause disease.
2. Chemical control According to the rainfall, Bordeaux mixture1:2: 200,8 was sprayed in early July.
Spraying again half a month ago can generally control the development of the disease. The control effect of spraying Dyson 1000 times is also certain.