The apple gold moths are very serious in some places. In some orchards, the damage rate of the leaves in the late growing season is as high as 100%. Sometimes there are more than 15 insect spots on one leaf, which results in serious loss of leaf function and early leaf loss.
?? Harmful form of gold worm larvae from the leaf back to eat leaf meal, the formation of oval-shaped insect spots, leaf back epidermis shrinkage, leaves bent to the back. The front surface of the leaves presents a yellowish-green mesh-like insect patch, commonly known as the "window-opening window," with black insect feces. Insects often occur on the edges of leaves, and when they are severe, they cover the entire leaf.
Life history and habits The golden-winged moths occur in the north of China in 1 year for 5 generations, and they spend their winter in the damaged leaves. In the second year, adults emerged as they germinated, and in late April, they occurred. In later generations, the adult emergence period is the first generation from late May to early June; the second generation is in early July; the third generation is in early August; the fourth generation is in late September. 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.
?? Prevention methods
1, manual 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 good control effect.
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