What if aphids grow on banyan trees?

Aphids are also called oil bugs, honey bugs, annoying bugs, excellent bugs and drought bugs. There are many kinds and high reproduction rate. The life cycle is complex, and the same species can have different forms in different seasons and environments. There are more than 2,000 species of aphids found all over the world, and the host sites with aphids are very common. Honey dew is the excrement of aphids. Transparent and sticky, scattered on the branches and leaves under the aphid group. Every little makes a mickle. The accumulation of these substances will block the stomata on leaves and hinder the physiological functions of plants. At the same time, honey dew is a culture medium for many bacteria, which will cause coal pollution on the surface of plants and affect the photosynthesis of plants. Common aphids on garden plants. There are mainly cotton aphids, peach aphids, peach aphids, locust aphids, pine aphids, willow aphids, rose aphids, long-handled chrysanthemum aphids and so on. Take chrysanthemum as an example, there are as many as five or six kinds of aphids, the longest and most serious of which is chrysanthemum aphid, which is harmful in greenhouse all year round. 1. Morphological characteristics of Aphis longituba (1) The wingless viviparous female aphid is 2 ~ 2.5 mm long, dark reddish brown and shiny. There are thick long hairs on the body, feet and touch. (2) Life history: Aphids longituba overwinters outdoors as wingless viviparous aphids, and reproduce in viviparous mode when the temperature rises in early March. When the average temperature is 8.9 ~ 265438 0.2℃, it takes 65438 04.2 days to complete a generation. In the average temperature range of11.1~ 23.4℃, each aphid can breed 542 offspring within 17 days, and the maximum can breed 69 1 head. Because aphids reproduce very fast, their mouths are often very dense, mostly at the tender stems at the top, with their heads low and their tails high. After they are still or crawling for a period of time, they will shake rhythmically every few seconds to ten seconds. At the same time, dozens of aphids can be seen, and the shaking movements are consistent. (3) Control method ① Spraying 40% omethoate 1000 times solution; 20% pyrethroid killing solution 4000 times; 50% chlorpyrifos 1500 times solution; 2.5% derris extract 1000 ~ 1500 times; 25% phoxim 1000 times solution; 1 kg tobacco leaves or tobacco stems are soaked in 15 kg water, and can be sprayed after 24 hours. ③ The protection and utilization of natural enemies mainly include Harmonia axyridis, Harmonia septempunctata, Harmonia punctata, Harmonia japonica, Syrphidae, Chrysopa, etc. 2. Cotton aphid (also called melon aphid): (1) The morphological characteristics are yellow or dark green of winged viviparous female aphid. The head, chest and chest backboard are black, and there are 3 or 4 pairs of black stripes on both sides of the abdomen. The abdominal cavity tube is cylindrical, black, with tile lines on it. Wingless viviparous female aphids are mostly yellow, and the frontal tumor is not obvious. There are two small conical protrusions on the chest back plate, and there are almost no marks on the back of the abdominal tube. The ventral tube is the same as the wing type. If there are winged aphids, they are yellow-brown or yellow-green in summer and blue-gray-yellow in autumn. There are short brown wing buds on both sides of the body. Insects are covered with wax powder. Aphids without wings have red compound eyes and no tail. It is mostly yellow-white to yellow-green in summer and blue-gray to blue-green in autumn. (2) There are many host plants of cotton aphid with life history, and nearly 300 species are known. Every year in late autumn, it will be transferred to overwintering hosts such as pepper, pomegranate, hibiscus and Ficus microcarpa to lay eggs and overwinter. In the spring of the following year, it hatches into a godmother and parthenogenesis occurs on the overwintering host for 2-3 generations. Winged aphids are produced from April to May. Fly to chrysanthemum, citrus, loquat and other flowers, and continue to parthenogenesis for more than 20 generations in the flowers, and peel for 4 times from nymph to adult aphid. Female aphids with wings were produced in late autumn and moved back to the overwintering host, giving birth to female aphids without wings and male aphids with wings that can lay eggs. After mating, the fertilized female aphid lays eggs in the gap between the trunk and bud axils for the winter. Only at this time of year will sexual generations appear. (3) The control method refers to the apple yellow aphid. 3. Myzus persicae (also known as Myzus persicae, Myzus persicae) (1) is a winged viviparous female aphid, with a body length of 1.8 ~ 2. 1 mm, black head and chest, green, yellow-green, brown and reddish brown abdomen, and dark spots on the back. The abdominal tube is slender, cylindrical, with a black end and a conical tail. The forehead tumor is obvious. The wingless viviparous female aphid is about 2.3 meters long, pear-shaped, green, orange, reddish brown, yellow and shiny. Abdominal ducts, skin flaps and frontal tumors are winged aphids. If the worm is small, it is similar to wingless viviparous female aphid. (2) Life history 1 year 10 ~ 20 generations, eggs overwinter on peach trees. In the second year, when peach trees germinate, the eggs hatch into dry mothers, which cluster on the buds to do harm, and then turn to flowers and leaves to continue parthenogenesis. From April to May, winged aphids migrated to other hosts, and in late autumn, winged aphids migrated back to peach trees, and soon produced female and male aphids. It can harm peach, oleander, pomegranate, plum blossom, orchid, cherry blossom, hollyhock, citrus and so on. The damage is extensive and serious, the damaged leaves turn yellow and curl irregularly, and finally the dried oranges fall off. At the same time, Myzus persicae is the main vector pest to spread viral diseases. (3) Control methods refer to aphids. 4. Myzus persicae (also known as Myzus persicae): (1) Morphological characteristics The winged viviparous female aphid is about 1.5mm long, with a dark green head and chest, yellow-green or orange-yellow abdomen and gray powder on her body. The abdominal canal is short and the frontal tumor is not obvious. The wingless viviparous female aphid is about 2.3 mm long, oval, light green and covered with white powder. The tail is conical, long and has three pairs of long hair. If the worm is small, it looks like a wingless viviparous aphid, light green and has a small amount of white powder. (2) Life history occurs for multiple generations in one year. In winter, eggs overwinter on peach and plum branches. The next spring, the eggs began to hatch, and the winged female aphids continued to reproduce. After the winged aphids are produced, they are transferred to Gramineae hosts such as reeds. In late autumn, winged aphids moved back to peach, plum, cherry, peach and apricot to lay eggs for the winter, and the host in summer and autumn was gramineous weeds. The injured leaves rolled back to back. There is often white wax powder secreted by aphids on the leaves.