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近几年来,我省大部棉区用来防治棉蚜的药剂多数为菊酯类和久效磷等农药。由于长期应用这些药剂,使大量棉蚜产生严重的抗药性,即使是增大药剂浓度,也需要增加打药次数,方可能控制为害,这大大地增加了劳力和用药成本。去年我站用新药剂久效硫磷防治棉蚜,经多点试验,获得了比较理想的效果。用久效硫磷防治抗性棉蚜,使用浓度为2,000—2,500倍液。当田间有蚜株率达50％左右时,开始喷药。据施药后10天、15天、20天调查,虫口减退率分别为82.2—99.9％、81.6—99.5％、60.5—98.8％。该药残效期可达15—20天,优于菊酯类及久效磷等农
In recent years, most of the cotton in our province to control cotton aphids most of the agents for the pyrethrum and monocrotophos and other pesticides. Due to the long-term application of these agents, a large number of cotton aphids produce serious resistance, even increasing the concentration of drugs, but also need to increase the number of fight drugs before they can control the damage, which greatly increased labor and medication costs. Last year I stood with a new drug long-acting thiophosphate control cotton aphid, the multi-point test, obtained the ideal result. With long-acting phospatide control cotton aphid, the use of concentration of 2,000-2,500 times the solution. When the field has aphid strain rate of about 50%, began spraying. According to the investigation of 10 days, 15 days and 20 days after application, the reduction rates of the population were 82.2-99.9%, 81.6-99.5% and 60.5-98.8% respectively. The drug residual effect of up to 15-20 days, better than pyrethrum and monocrotophos and other agricultural