Control measures of aphids in planting peach trees

There are many kinds of aphids, and the main ones that harm peach trees are peach aphid, peach powder aphid and peach tumor aphid.

(1) the characteristics of harm.

When the three kinds of aphids sprout and spread the leaves of peach trees, adult and nymph aphids swarm on the back of peach leaves and tender shoots, thus harming the leaves. The injured leaves show small black, red or yellow spots, which make the leaves white and curl gradually, cause fallen leaves seriously, weaken the tree potential, and affect the yield and flower bud formation of peach trees. Therefore, we must pay attention to timely prevention and control.

(2) Control methods, the best period for aphid control is when peach leaves show green and flower buds appear, the drug can be used once, and then it can be used again for 1 or 2 times according to the insect situation, and each time must be before the curling leaves are caused, otherwise the control effect will be affected. The specific methods are as follows:

① sprays chemicals. There are many medicaments to choose from, including 35% endosulfan EC 1500 times, 50% aphid mist 3000 times, 50% phoxim EC 1500 times, 40% omethoate 1500 times, 50% marathon EC 1000 times, imidacloprid 5000 times, etc. In order to improve the control effect, a certain amount of developing agent can be added to the solution, several agents should be used alternately, and the use of a single agent should be avoided as far as possible.

② agent is smeared dry. Use 40% omethoate 1 part, add multifunctional plant synergist 1 part, add water 2 parts, mix to make medicine liquid. Apply a 10 cm wide ring on the tree trunk with a brush. If the bark is rough, scrape off the old bark before applying medicine. After application, wrap it with newspaper or plastic film.

③ trunk injection. That is, an iron cone is used to obliquely prick the hole from top to bottom on the trunk, reaching to the xylem, and then 40% dimethoate is injected with No. 8 syringe to close the hole. More than 95% of the aphids can be killed after 2 or 3 days.

④ protects predators. There are many natural enemies of aphids, such as ladybugs, aphid flies, dragonflies, parasitoids and so on, which have a strong inhibitory effect on aphids. Therefore, it is necessary to spray broad-spectrum pesticides as little as possible and avoid spraying in periods when there are many natural enemies, so as to protect natural enemies and use natural enemies to eliminate aphids. It is of great significance to protect the ecological environment of orchards and produce pollution-free green fruits.