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Occurrence and control of apple gold moth
In the past few years, the occurrence of apple leafworm was very serious. In some orchards, the damage rate of the leaves in the late growth season was as high as 100%. Sometimes, there were more than 15 insect spots on one leaf, resulting in serious loss of leaf function and premature leaf loss. First, the harm. The golden larvae larvae eat leaf flesh from the back of the leaf to form oval spots, the back surface of the leaves shrink, and the leaves are bent to the back. The front of the leaves showed a yellow-green mesh insect spot with black insects. Insects often occur on the edges of leaves, and when they are severe, they cover the entire leaf. Second, the law of occurrence. Five years after the first generation of golden thread moths, wintering was observed in the damaged leaves. In the second year, adults emerged during the germination of the apple, and each generation of adult emergence occurred from late May to early June of the first generation; early July of the second generation; early August of the third generation; and late September of the fourth generation. Late generations overlap. The last-generation larvae were overwintering in the insect pests of the damaged leaves in late October. Adults mostly move around in the morning and early evening, spawning on the back of young leaves, and producing scattered grains. After hatching, the larvae bite the egg shells from the contact between the eggs and the leaves and directly invade the leaves. After the larvae are matured, the insects in the insect spots turn into larvae. During the eclosion, half of the pods are exposed outside the insect spots. Third, control methods 1. Artificial control. After the fallen leaves of the fruit trees, the fallen leaves are removed and burned together to eliminate overwintering. 2 chemical control. The critical period of prevention and control is the generation of adults at each generation. Among them, in the first generation of adult emergence spraying, the control effect is better than the later control. The commonly used pharmaceuticals include 80% dichlorvos emulsion 800 times, 50% killer pine emulsion 1000 times, 20% cypermethrin 2000 times, 2.5% deltamethrin 2000-3000 times, 30% mothcopene wettability Powder 1200 times. In addition, 25% diflubenzuron 3x suspension 1000 times also has a good control effect (the drug has no killing effect on the parasitoids of the main natural enemies of the goldenrod moth). 3. Biological control. There are many parasitic natural enemies of the golden-headed moth, among which the golden-winged moth is the most frequent in the hop bee, and its occurrence and age are coincident with that of the gold-grained moth, spawning in the host egg, which is parasitic to eggs and larvae. Bees should be protected and utilized.