Cotton Seed Dressing and Prevention of Cotton Aphid

First, the occurrence of cotton aphid cotton aphid cotton seedlings is an important pest, widely distributed throughout the country, is one of the main pests in cotton production areas. They have been clustered on the back of the leaves and on the tender tips to suck juice, and the damaged tissue cells are damaged, causing the cotton leaves to curl back, the plants shrinking, and the honey dew is secreted, causing fungal parasitism and affecting photosynthesis.

In the northern cotton region, it takes 10-20 generations a year. From April to May, it damages the cotton fields. It damages the newly emerged cotton seedlings, and then reproduces in the cotton fields. From May to June, it enters the peak period of damage, and the amount of earthworms decreases after the end of June, but the drought Years of damage extended more. Miao Miao occurred in the end of June, from mid-May to the end of June to the bud, before entering the flood season. Fuxi occurred in late July-August, adapting to high temperatures. Heavy rain has a significant inhibitory effect on cotton aphid. Rainy or rainy seasons are unfavorable, but when the weather is sunny, the weather facilitates the rapid proliferation of the volt. Normally, Fuxi 4-5 days proliferates for 1 generation. Miao wolfberry needs more than 10 days to breed for 1 generation, and field generations overlap. Cotton aphids occur at a suitable temperature of 17-24°C and a relative humidity of less than 70%. When a cotton-wadded corps was sown and planted early in the cotton field, it was seriously affected. When the cotton and wheat, rapeseed, and broad beans were interplanted, the cotton locust occurred late and light.

Two, two methods of prevention

1, seed treatment. (1) Dressing with imidacloprid, 10% imidacloprid EC or WP 100g 3-5 kg ​​light seed or Weiyuan Fudie (70% imidacloprid dispersible powder) 15 g light seed 3-5 kg, first dissolved imidacloprid, The well-tuned liquid sprayed evenly on the seeds, mix well, heap stuffy. The boring time is generally more than 24 hours. In the absence of germination, the longer the time, the better. To facilitate the full absorption of the drug.

(2) The cotton after seed dressing has less seedling pests, which reduces the use of pesticides at the seedling stage, which in turn reduces the damage to the cotton seedlings sprayed on the seedlings. In the early stages, the insects will not become tired of the aphids, and the growth will be better. Earlier, the actual survey conducted in Qiuqiu County found that the budding of cotton after seed dressing was about 7 days earlier than that of non-seedling cotton. Dong Xinghua in Qiu County has contracted 120 mu of land in Jixi and planted cotton. After planting seeds with Weiyuan imidacloprid, from April 27 onwards to May 31st, a medicine for controlling aphids was not sprayed. “This year I was stirring by hand and I was not evenly mixed. I will use a seed mixer next year and try to mix it evenly to make it even better.” Dong Xinghua said with confidence. Without seed dressing, the medicine used to control locusts has been used 5 times or even 6 times. Chen Fusheng, who contracted 40 acres of land on neighboring plots, said: “I also planted on April 27th, but by now (May 31st) I’ve played 4 times, fighting my legs and stomach. With cramps, I was quickly exhausted.” Visible seed dressing not only saves the cost of medications, but also at least reduces the farmers’ drug use by more than 3 times, which greatly reduces the labor intensity of farmers’ friends. It can be seen that the importance and necessity of cotton seed dressing.

2, pharmaceutical control. First of all, we must look at the prevention and control indicators. When the cotton 2-3 leaf leaf rolling rate is 45%, the number of 100 strains is about 4500, and after the 3 leaf stage, the leaf rolling rate is 50%, and the number of 100 strains is about 6,000. The cotton fumonium prevention and control index, when serious damage occurred in early July, was an average of 680 pods of 3 leaves per plant. When the damage occurred in late July was when the number of 3 leaves per plant was about 200, it reached the control index of cotton seedlings at the seedling stage. When the amount of cottonseed meal reaches the prevention and control index, the following pesticides are used, and the spray is even and meticulous. 5% acetamiprid EC2500-4000 times, or 3% acetamiprid ME1000-1500 times, or 20% acetamiprid soluble liquid 6000-8000 times, or 25% imidacloprid WP6000 times, or 30% acetyl Methamidophos EC1000-2000 times solution.