Preventing green onions when autumn humidity is low
In recent years, the onion thrips have been seriously affected. Besides damaging the green onions, onions, garlic, leeks, potatoes, tomatoes, cabbage and other economic crops have also been jeopardized. Onion thrips mainly damage the heart and leaves of the crops, sprouts and flower organs, and harm the sap of adults and nymphs. On the damaged onion leaves, there are white long strips. Usually the old leaves are heavier than the new leaves. The upper part of the leaves is heavier than the lower part. In severe cases, the leaves are distorted and have dry tips, which seriously affects the growth and quality of Chinese green onions.
Weather conditions are the most important factor affecting the occurrence of thrips. Onion 蓟 喜 喜 喜 喜 喜 low temperature and low humidity, the temperature reached 25 °C, relative humidity below 60% is conducive to the onion thrips occurred. High temperature, high humidity and heavy rain will affect its growth, development and reproduction. This is the main reason for the low occurrence of summer thrips in spring and autumn and warm winter. In addition, more weeds and more extensive management will also cause serious problems in the onions where the soil is infertile.
Prevention and control of onion thrips should take comprehensive measures. (1) Agricultural control. Application of decomposed organic fertilizers, strengthening of field management, removal of weeds in and around the field, maintenance of cleanliness in the field, timely watering in case of drought and application of quick-release fertilizer. (2) Lure killing. When the leaf damage rate reached 20%, sticky worm traps were used. Select a white cardboard with a length of 50 cm and a width of 40 cm, put on a plastic bag, and apply Vaseline on both sides. Then place it 10 centimeters from the ground, and fix it by placing it 3 to 5 meters apart. (3) Chemical control. Per acre with 10% imidacloprid wettable powder 35-40 grams, or 20% acetamiprid wettable powder 10-15 grams, or 25% pymetrozine wettable powder 20 grams, add water 30 kilograms spray, on the onion thrips Better control effect. Note alternate medication, withdrawal from 7 to 14 days before harvest.
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