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What is it that fortune teller will turn black when applying peach leaves and yellow hands?

Peach leaves may turn yellow for two reasons. One is caused by lack of nitrogen, which is mainly manifested by yellowing of leaf springs. It can be prevented by applying urea to roots and leaves. The other is caused by iron deficiency, showing blue veins and yellow meat. This can be prevented by spraying chelated iron fertilizer on the leaves after germination. For curved leaves, it is likely to be caused by aphids, which is what fruit farmers call aphids. Every spring, when the new buds of peach trees grow in pairs, aphids will gather on the tender branches and leaves of peach trees to suck the juice. After being killed, the peach leaves show small black spots, red and yellow spots, and then gradually shrink or even fall off, which not only affects the formation of flower buds, but also weakens the tree. Honeydew discharged by aphids pollutes leaves and branches, blocks the physiological function of peach trees, often causes bituminous coal disease, accelerates early defoliation and affects growth.

Aphids that harm peach trees all harm peach trees in early spring, especially in April-May, aphids breed fastest and do the most harm. Transfer to other crops in summer and autumn, and then move back to peach trees to lay eggs in winter. Therefore, it can be controlled many times a year, and the specific methods are as follows: the key period of chemical control is the incubation period of winter eggs, that is, the germination period of peach buds and the period before the damaged leaves roll after the peach leaves fall off. From flowering to early summer, according to the insect situation of that year, use 1~2 times again. When a large number of insects move back to peach trees after autumn, they can also be used properly once. Commonly used pesticides are imidacloprid wettable powder or cypermethrin emulsifiable concentrate. See the instructions for specific dosage.