Peach leaves curly yellow hair causes

On June 7th, during an interview with Mujiazhai Village, Litai Sub-district Office, Yangling Demonstration District, Shaanxi Province, the fruit farmer Yale Ling consulted with reporters. The peach trees in his orchard were planted four or five years ago and they can be considered as new trees. This year, there are several trees that have symptoms such as leaf curling and yellowing. I don't know what caused it. There are many black locusts in the trees, and I don't know how to control them. In this regard, experts from the advisory group of the newspaper and expert on fruit trees of Northwest A&F University, Professor Lu Pinghui, said that there may be two reasons for the yellowing of peach leaves, one is caused by nitrogen deficiency, and the main manifestation is that the leaves turn yellow, as long as their roots are And urea can be used for prevention and treatment. The other is caused by iron deficiency, which shows green veins and yellow leaves, which can be sprayed with chelated iron fertilizer after germination. For leaf curling, it may be caused by aphids, which are the locusts that fruit growers say. Every spring, when the peaches sprout and leave the leaves, the locusts gather on the twigs and young leaves of the peach trees to suck juice. The damaged peach leaves show small black spots, red and yellow spots, and then they gradually curl and even fall off. Both affect the formation of flower buds, but also weaken the tree. The honeydew excreted by the locusts contaminated the foliage and shoots, impeding the physiological function of peach trees, often causing bituminous coal disease, accelerating early defoliation and affecting growth. The aphids that harm peach trees are harmful to peach trees in early spring. In particular, from April to May, the aphid breeds fastest and is the most dangerous period. In the summer and autumn, it is harmed to other crops, and it is relocated to peach trees in winter. Spawning winter. Therefore, it can take many times a year to prevent and control, the specific method is as follows: The key period of pharmaceutical control is the incubation period of winter eggs, that is, the germination period of the peach tree buds and the undamaged leaves before the leaves fall. After flowering to early summer, 1 to 2 doses were used depending on the situation of the year. In the case of a large amount of insects that can be returned to peach trees in the autumn, they can also be used once. The commonly used agents are imidacloprid wettable powder or cypermethrin EC, see the instructions for specific dosage.

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