Harm and control methods of cotton aphid
Cotton aphid is the offspring of cotton aphids at seedling stage. After ambush, aphids begin to harm cotton, and its harmfulness is much greater than that of aphids at seedling stage. The oily excretion of aphids is covered with cotton leaves, reducing leaf function, hindering the normal progress of photosynthesis, hindering the transport of nutrients, causing cotton tender leaves to curl, thus causing cotton buds and bolls to fall off. Therefore, the prevention and control of aphids is an important measure to strive for prolificacy and premature production of summer peaches.
1. Grasp the opportunity of control: cotton aphids usually lurk on the lower leaves of cotton and migrate to the upper leaves, tips and branches, while the upper aphids crawl down or around. When wingless aphids spread to the whole cotton plant, the nutrition of the whole plant tends to deteriorate and can not meet the growth needs of wingless aphids, winged aphids migrate and spread outward, and this vicious circle does great harm to cotton. Therefore, before the wingless aphid migrates from the bottom to the upper to produce the winged aphid, 5% to 8% of the cotton leaves in the cotton field are curled, which is the best time to control the aphid, and the time should be in the first and middle of July.
Second, the combination of soil and foreign countries, comprehensive application of pesticides
When using drug control, before using medicine, you should first kill 2 or 3 old leaves under the cotton plant, and concentrate on deep burial, retting fertilizer or burning, and then choose drug control.
1. Powder control: use 2.5% trichlorfon powder, or 1.5% 1605powder or 1.5% dimethoate powder, 2000kg 6000g spray every 667m2, or mix trichlorfon powder and plant ash at 1:1.
two。 Fumigation prevention and control method: fumigation will achieve better results when the ridges have been closed in the cotton field and it is difficult to control aphids on the bottom leaves. The method is to mix well with 8% dichlorvos emulsion 100g ~ 150g, 4 kg ~ 5 kg water, sprayed on 5 kg ~ 8 kg wheat bran, half on the ground and half on cotton plants at noon or evening when there is no wind. It can also be sprayed on the back of the middle and lower leaves of cotton plants with 80% dichlorvos emulsion in a liquid of 300 to 400 times, 20 kg ~ 30 kg per 667 square meters, which can also have the effect of fumigation.
3. Spray prevention and control method: 40% omethoate or 50% malathion emulsion can be used to form 1000 to 1500 times liquid, 50 kg ~ 60 kg per 667m2, sprayed on the back of cotton leaves, it also has a good control effect. The use of organophosphorus pesticides in the prevention and control of cotton aphids, such as 3911, 1605, 1059 and other internal agents, is easy to cause human and animal poisoning, which should be paid special attention.
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Cotton mulching cultivation technique and its benefit
In recent years, with the popularization and popularization of transgenic insect-resistant cotton and insect-resistant hybrid cotton and the wide application of plastic film mulching cultivation techniques, cotton developed earlier and bolls per plant were more and earlier. Cotton in continuous cropping cotton field is easy to mature prematurely. Mulching straw in the cotton field covered with plastic film can not only promote the early emergence of seedlings, but also prevent the premature senescence of cotton, so cotton mulching cultivation technology has been paid more and more attention by cotton farmers. At present, the cotton areas in the Yangtze River and Yellow River basins are often covered with 2 rows of root zones, and most of the cotton areas are covered with 4 rows, 6 rows and 8 rows. The way of plastic film mulching is to sow cotton first.
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The new cotton strain Zhongchang-03 is favored.
One autumn day, although it was drizzling and accompanied by 3Mel 4 northerly wind, it did not stop more than 40 representatives from all over the province from going to Changxinpu Village of Diaodong Cotton original Farm in Hanchuan City to observe and inspect the new cotton strain Chang-03. although the representatives' feet and trouser legs were covered with mud, they saw that the cotton plant was covered with 3040 large and round cotton peaches. The deputies came to the field to count and watch and were busy. One representative had nearly a hundred cotton plants, eager to be uprooted. Jiang Gong, Director of Cotton seed Industry, Cotton Research Institute, Chinese Academy of Agricultural Sciences
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