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Comprehensive Prevention and Control of Cotton Bollworm in Apple Nursery
The damage of cotton bollworm in Apple nurseries is mainly concentrated in July and August, and serious problems occur in nursery gardens for growing crops such as wheat, corn, and vegetables. The harm of cotton bollworm in the nursery nursery begins with the budding and feeding of freshly grafted buds, causing dead buds and reducing the grafting survival rate. When the grafted seedlings grow rapidly, the young shoots and young leaves of the scion are fed to affect the scion. Growth rate, bifurcation and even "broom seedling" phenomenon, thus reducing the quality of seedlings. The main measures for prevention and control are as follows: 1. Winter deep-turning is aimed at the wintering of the bollworm in the soil in winter. Before the winter freezing, combined the application of organic fertilizer to deepen the soil of the nursery, so that the organic fertilizer can be turned in. Underground, increase soil organic matter, mature soil, but also can be overwintering insects in the soil to freeze out, or be eaten by birds, thereby reducing the number of cotton bollworm base nursery nursery in the coming year. Second, chemical control Apple nursery nurse in the prevention and treatment of cotton bollworm mainly chemical control. The first adult of Helicoverpa armigera was generally seen in the middle and early June, and was spawned in the apple nursery in late June. At this time, the control effect of 1,200-fold Qingfeng No. 1 was better. Other anti-infective agents are 2000 times 2.5% Uranus EC, 2000 times 2.5% Kung Fu EC, 1500 times 5% rifazone, 4,000 times eradicated and 1,500 times methomyl. H. armigera occurs in 3 to 4 generations in 1 year, generally starting from July. Larvae of different ages harm the young shoots and young leaves of apple grafted seedlings in the nursery nursery. Therefore, from the end of June, it should be sprayed once every 10 days. By late August, the use of insecticides can be gradually reduced. Third, trapping and killing adult worms to reduce the number of apple nursery nurse base, according to the Haemophilus nocturnal habits, can be trapped killing adults. Adults of the cotton bollworm are most active at 7 to 9 o'clock in the evening and at 3 to 5 o'clock in the morning. In a small area of ​​breeding grounds, the use of cotton bollworm adults on the convergence of the new withered branches of the poplar, the branches of the Yang will be tied into the ground, insert 10 per acre to lure the adults. Put a moth in a plastic bag before sunrise every day. According to the situation, poplars can be replaced once a week for 3 to 4 weeks. In a large area of ​​breeding grounds, according to the adult phototaxis and chemotaxis, a black light is installed for every 20 mu, and the light is turned on, and a pot of water is placed at 10 to 15 cm below the lamp. A small amount of kerosene is dripped onto the surface of the water and the pot is dropped in the morning. The adult fish out. Fourth, biological control of large areas of nursery, can also be put Trichogramma or spray Bt preparation methods for the prevention and treatment of bollworm. If necessary, artificial killing of larvae can also be used to reduce the damage of the bollworm. Jia Dongmei Wang Ruibao (Jiaoshu Station, Jiaozhou, Shandong Province 266300)