During this period (mid-April to early May), the damages of leaves, young shoots, young fruit and branches were mainly examined. Focus on red spiders, leaf roller moths, apple astragalus, apple cotton aphid, green aphid, cotton bollworm, and longhorned cattle. Look for spider mites on the inner leaf, whether there are aphids on shoots, and whether the tips of young shoots are green blind. For fleas, check for tender bollworm larvae on young leaves and young fruit. For seedlings and saplings, the focus was on the presence of leaf roller moth larvae on the tops of the shoots and on the leaves of the branches. Whether there was a white floc (damage by apple floss) at the branches of the scars and at the kerfs, and whether there was a large amount on the trunk and on the ground. Fresh sawdust-like faeces (Cinnabar harm).
When the amount of insects is large, according to the type of insect pests, the symptomatic agent is sprayed and controlled. It is worth noting that young fruit is sensitive to pharmacological agents and is prone to phytotoxicity. Spraying of emulsifiable concentrates and poor quality pesticides should be avoided during this period. Specific prevention indicators and measures are as follows:
When the number of red spiders reaches 2 per leaf, they can be sprayed with acaricides such as ethylcarbazole or spirooxamate; when the shoot rate exceeds 60%, imidacloprid, flonicamid, beta-cypermethrin, and spirosol can be sprayed. Insecticides such as insecticidal ethyl esters or lysoprofen prevent and control maggots, such as green-blind lice, apple silkworms, and scale insects. In the case of apple sponge, when the spot is generated in the garden, it can be wiped off by hand or brushed away. If the occurrence is widespread, besides spraying the above-mentioned agent on the whole branch, 10% imidacloprid wettable powder 1000 should be used at the same time. Irrigation times; if there are more cotton bollworms in the orchard, they can be sprayed with agents such as methotrexate and beta-cypermethrin, as well as lepidopteran pests such as pear borer and leaf roller moth; fresh defecation holes are found on the trunk, and they are immediately discharged with a syringe. Inject a 1-2 ml 50-100 times solution of dichlorvos, chlorpheniramine, or cypermethrin into the fecal hole, and seal the hole with mud. Be careful not to use the original drug injection to prevent phytotoxicity.
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