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Prevention and Control of Cotton Blind Stem
First, the symptoms of cotton blind caterpillar adult nymphs, nymphs sucking mouthparts into the cotton plant head, young leaves, buds, young bell, absorb cotton tissue juice, the top buds of cotton seedlings become black and dry, the main stem to stop growing The formation of clusters of adventitious buds and long cotton. In mid-to-late May, when you see the black spots on the heart, you can find bugs, and the heart leaves continue to grow, and the leaves are shrunken to form deformity. From mid-July to August, after rainy days or watering, tender stems and tender tips are most vulnerable. After being damaged, the young buds become weak and dry and fall off, easy to form empty branches and clumps of leaves, which is conducive to breeding of harmful insects, resulting in a significant reduction in production. Second, control methods (1) Reasonable fertilization, reasonable dense planting, timely topping, prevent cotton leggy, remove cotton fields and weeds to reduce the degree of its occurrence; (2) early inspection, diligent inspection, timely detection and early detection , can be combined with the prevention and control of aphids and cotton blind lice; (3) As adults have migration, cotton and cotton contiguous areas where the parties are concentrated, should be sprayed as early as possible in the initial occurrence of pests to ensure the control effect; (4) Chemical control can occur in the mid-June and mid-July. The occurrence of cotton aphid will occur at the peak period. Spray with 4.5% beta-cypermethrin 1000 times and 10% imidacloprid 1000 times. Because adult fly is good, there are residues after each spraying, and should be sprayed several times in succession. The growth of high-density cotton fields and rainy years should pay more attention to management, strengthen prevention and control, and use drugs once every 5 to 7 days. Continuous control 3 to 4 times. Pay attention to medications in the early morning or evening, spraying weeds and shrubs near the ground when spraying. If the combination of spraying and field fumigation is used for prevention and treatment, the effect is better.