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Hello everyone, we are middle peasant agriculture observation. Recently, it is the flowering period of peach trees, and after the peach trees fall flowers, it is often the time when various pests hit in batches. In particular, some areas have begun to bear young fruits, and if they are killed at this time, it will definitely have a certain impact on production, so it is very important to prevent diseases in advance. Today I will tell you about what diseases and insect pests are susceptible to after the peach tree falls and how to use medicine to control it.
Apple leaf curl moth is a pest
<h1 class="pgc-h-arrow-right" data-track="4" > aphids</h1>
If the peach tree does not carry out medicinal control before the flowering period, then the aphid pest will be more serious after the peach blossom is removed. This is the last critical period for aphid control, and if it is not controlled, it is almost difficult to control aphid pests in the future. Peach aphids will suck the sap of young tissues, and the peach leaves after being killed show small black spots, red or yellow spots, and the young leaves gradually lose their green and yellow and turn white, causing defoliation in severe cases, weakening the tree potential, which can reduce crop yield and affect flower bud formation. The honeydew secreted by aphids can also contaminate the leaves and branches, causing coal pollution and reducing fruit quality.
The control of peach aphid has long mainly relied on agents such as acetamiprid and imidacloprid, resulting in a high level of resistance, so we are best to use the agent for compound use. The agent can not be used in the full flowering period, the best time is after 80% of the flowers, the drugs that can be selected are high-efficiency cypermethrin, imidacloprid, acetamidine, spironoethyl ester and so on. We can also take advantage of the yellowing nature of peach aphids, hang yellow plates or coat the branches with butter and engine oil to trap and kill.
Aphids are infested
<h1 class="pgc-h-arrow-right" data-track="39" > second, green blind bugs</h1>
In addition to sucking the sap of the young leaves of the peach tree, causing black-brown necrotic spots and worm holes, the green blind bug will also harm the young fruit of the peach tree, making the skin of the young fruit produce yellow-brown thorn spots, and the unevenness around the fruit surface greatly affects the quality of the fruit. The symptoms caused by green blind bugs often have a 14-day cycle, that is, it takes 14 days from the time they are started to be harmful to the time when we can find holes in the leaves with the naked eye, so it is too late to wait until the symptoms are manifested.
Moreover, because the eggs of the green blind bug have the characteristics of "hatching in the rain", every rainfall, there is a small peak of hatching, so it is almost impossible to carry out one-time complete prevention and control, it is necessary to continue to use medication, it is best to have control measures after each rainfall, the recommended agents are flufenacil, dipropylcyclositone, cypermethrin, cypermethrin, etc., it is also best to use alternately for spraying.
Green blind bugs are harmful
<h1 class="pgc-h-arrow-right" data-track="40" > third, leafhopper</h1>
Leafhoppers like to cluster on the back of the leaves to suck harm, the initial leaf of the damaged leaf appears dense yellow-white spots, so we often call it "peach a little leafhopper", with the development of the disease, the spots will gradually expand into pieces, when the whole leaf is pale and dead, affecting the next year's flowering and fruiting. Adult leafhoppers are active in sunny weather and high temperatures, and less active in the early morning, evening and rainy days.
Late May, late July and early August are the peak incubation periods for leafhoppers, so it is important to control them before these two periods. The agents that can be selected are 5% high-efficiency cypermethrin emulsion 200-3000 times liquid, 20% rapid killing butadiene emulsion 3000 times liquid, etc., and pyrethroids can also be compounded with nicotine agents, such as high chlorine with thiamethiazide.
Leafhoppers are harmful
<h1 class="pgc-h-arrow-right" data-track="41" >4</h1>
During the flowering period of the peach tree, the larvae of the apple leaf curl moth mainly harm the young buds, buds and young leaves, and they will stick multiple leaves together through spit silk and sneak into it to eat the leaf flesh; after the young fruit grows, it will gradually begin to harm the peach fruit. They hide on leaves close to the fruit, nibbling on the peel and flesh under the leaves, eventually leaving irregular insect scars on the fruit surface.
Apple leaf curl moth control should be early, and when it has rolled up the leaves and hidden in the curly leaves, it is difficult for the agent to contact it, and it is difficult to control. The agents that can be used are 45% propromooctanthion 1000 times liquid, 20% cypermethrin 1500 times liquid, 40% acetone 1500-2000 times liquid, etc., continuously used 1-2 times, at intervals of 7-10 days, spraying larvae. The drug can also be rotated to delay the development of resistance. If insect packs have been produced (the larvae have been rolled in the leaves), it is necessary to use an agent with an assorption effect, such as avicetic salt.
Conclusion: For the control of the above diseases, it can be targeted and selectively controlled according to the incidence of the disease in the peach orchard in previous years; if you can't grasp the high-incidence insect pests, you can also choose some universal (can control most of the pests) insecticides to use, but it is best not to use only one agent for a long time, as many alternate uses as possible, and drug resistance has been avoided.