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Occurrence and Prevention of Snail in Cotton Field
Snails, commonly known as dog snails, are mollusks with shells, gray snails and the same type of snails, and Sun villages have more snails. The damage to snails on cotton is mainly the use of sharp-toothed tongues to feed crops. When the cotton is young, the cotton stem can be cut off, resulting in lack of seedlings. Its leaf stage damage can eat up a large number of leaves, and bud stage can bite the cotton leaves. Snails crawl in cotton fields and cause molds due to faeces and mucus secretion, affecting the growth of cotton seedlings. There are 1.5-60,000 heads of snails per acre and the loss of cotton can reach 5-15%. First, the law of occurrence. Snails have 1-1.5 generations in 1 year and there are 2 peaks for spawning, 1 in April and May and 9 to 10 months. Mature snails in the spring began to spawn, some died after spawning, and some took until the end of June. During July-August, high temperature and drought occurred. After the spawning, the snails sealed off over the summer. After the temperature dropped, they started feeding and spawning. When the temperature dropped to 10°C, they entered the soil for winter. Snails are afraid of high temperature and drought, but there are still individual activities when the rainy weather in summer or the dew at night is relatively large. Snails often occur in local cotton fields. One is the continuous cropping of cotton fields in the snails last year, and the second is the continuous use of green manure, broad beans and rapeseed for cotton fields. The control index of cotton fields is 3-5 heads per square meter, or the damage rate of cotton seedlings is about 5%. Second, prevention and control measures. 1, agricultural control: artificial killing. In the early morning, late evening and rainy days, snails are caught while they are active on the plants; ducks feed on them. Snails are fed back to the ducks to feed them, and then they are allowed to feed their ducks into the fields for foraging; Usually in April-May, combined with loose soil in cotton fields, the eggs produced in the soil will be turned to the surface of the earth so that they will be exposed to air and sun-dried eggs will burst and die on their own. 2. Chemical control: 3-4 kg of tea seed cake per acre is used to break water and soaked for 8 hours. The residue is filtered and 50-75 kg of water is added. The cotton seedlings and other damaged crops are sprayed, or the tea seed cake is cracked and crushed. Powder applied directly. The application of 1.5 kg of calcium carbonate and 2.5 kg of slaked lime also had a certain effect. It is also possible to use snails and worms to spread cotton fields.