On the afternoon of April 11th, a fruit farmer in Weihai, Shandong Province, made a phone call and asked about the occurrence of leaf larvae on his apple blossoms. The larvae are now less than 1 cm long, and their body color is yellowish-green. The shoots vibrate and the larvae spin off. suspension. Only know that this pest is a leaf roller moth, but I do not know what moth? What is the prevention and treatment? A: Comrade Kong Fanqing, hello! The leafroll moth you describe should be the macula lutea. The pest’s first instar larvae first infested the flower buds, drilled into the shoots or at the base of the flower buds, and after the fruit trees had spread leaves, the larvae often spun silk and connected several leaves to feed on the leaves in the larvae, or they ate away leaves leaving only leaf veins. Leaf clusters curled into clusters or licking fruit peels. The yellow-spotted moths occur in the northeast and north parts of China for 3-4 generations in one year, and winter-type adults in the orchard weeds, deciduous, sunny and masonry gaps and winter. In early March, apple flower buds begin to sprout at the time of germination, and in late March it will enter the peak period. The egg generation period of each generation is generally: the first generation in early April, the second generation in June, the third generation in early August, and the fourth generation in early September. The generations of adult offspring occur in early June, early August, early September, and mid-October. The first generation of the insects in the first generation of the macula larvae appeared to be in order and each generation overlapped. Therefore, drug control has the best effect in the hatching of the first and second generation eggs. The larvae of the leaf-winged moth have the habit of turning leaves, and they like to harm the young leaves in the middle and upper parts. When the larvae mature, they often transfer to the new leaves for pupa. The pupa period is about 13 days. Control methods: 1 clear insect source. Clean up weeds and litter and eliminate overwhelming insect sources. Since this year's larvae have already occurred, this work has failed to catch up. Look forward to your attention this spring and early spring. 2 chemical prevention. The early 1st and 2nd generations of eggs hatched and were sprayed with 2000 times 48% of Lethburn or 1,000 times 25% of diflubenzuron No. 3. Although the effect of insecticide is obvious, the drug not only kills pests but also kills natural enemies. Diflubenzuron is an insect growth regulator. The insecticide mechanism of this agent is to inhibit chitin synthesis of insect epidermis, so that the larvae can not be normally exfoliated and die. The drug efficacy appears 2 to 3 days after application, and the effective period is 15-20 days, low toxicity to humans and livestock, and safety to plants and natural enemies. 3Physical methods: Trichogramma was released from the septum or interlace during the occurrence period of the macula lutea, and the bees were placed 3 to 4 times in each generation. The interval was 5 days and the number of bees was 1000-2000 per plant. The leaves could also be removed promptly. New shoots, concentrated elimination.
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