Three generations of cotton bollworms
Slant Ring,E Cig Ring,Silicone Vapeband Shenzhen Piofond Technology Co., Ltd. , http://www.szliionbattery.com
November 07 18:02:39, 2018
Based on the analysis of weather conditions, it is expected that three generations of cotton bollworms in cotton fields in our province will have moderate occurrences. The egg period is August 12-22, which is about 1-3 days later than usual. Based on: (1) Most of the second-generation insect populations in cotton counties rose rapidly, and the amount of field insects was high. In the early July of this month, H. armigera had a pest field rate of 8%, two hundred eggs and two eggs, one hundred larvae and three eggs, and a small amount of eggs, 5.5 and 4.5 fewer than the same period last year. The egg volume was 14.5 grains and 100 larvae were 7.5 heads, which was 13.4 grains and 5.1 heads less than last year. The young larvae accounted for 50.7%, and the larvae above the third instar accounted for 49.3%. The development progress was slightly faster than last year, but it was 2-3 days later than the calendar year. On Jan. 28-29, Jianyang had 89.47% of the pest field rate, 68.4% of the standard land plot ratio, 42.89 eggs per 100 eggs, and 6.37 young larvae of 100 young larvae. Compared with the same period of last year, the rate of pest field and the rate of reaching the standard were respectively high. 0.7%, 31.9%, 100 eggs and 100 larvae were 16.2 and 1.5 respectively. Renshou had an average 5.3% egg rate on July 17th, one hundred eggs, 6.7 grains, an insect strain rate of 9.3%, and a hundred insect strains of 9.3 heads; on July 23, there was an egg plant rate of 38.7%, and the number of eggs per 100 plants was 86.7 The number of grains was 2.1 more than that of the same period of last year. The rate of insects was 10.7%, and the number of insects per 100 strains was 13.3, which was 6.9 more than that of the same period of last year. (2) According to meteorological forecast, the precipitation in the east of the third generation egg stage and larvae infestation period will increase, while the other areas will be less. Moderate rainfall during the dry season will damage the hatching and larvae of the third generation cotton bollworm in the cotton field. Preventive measures: for the amount of eggs to reach the standard field, mu with 10% Efficient Decapitated 10-15 ml or 35% endosulfan EC 120-150 ml or 40% endosulfan-Xin EC 75-100 ml or 40% Huifeng Emulsion No. 50 50-70 ml or 44% Duoqingqing EC 60-80 ml water spray, after the first application of the control interval after a week.