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BT生物制剂的活性成分是苏云金杆芽孢和伴孢晶休,为高效无公害微生物杀虫剂。其晶体蛋白被敏感幼虫取食后,破坏细胞膜透性,导致肠道麻痹、拒食,直至饥饿死亡。经过试验,BT生物制剂对棉铃虫有较好的杀虫效果。现将试验报告如下: 一、材料与方法 1、供试药剂 (1)BT 1:500倍液100A/666.7米~2。 (2)BT 1:800倍液65克/666.7米~2。 (3)BT 1:1200倍液40克/666.7米~2。 2、处理 试验前茬棉花,水肥条件中上等,棉花长势良好,棉铃虫重发生,已超过防治指标。在棉铃虫卵孵化盛期至3龄幼虫前,7月5～10日用喷负式喷雾器常规喷雾,喷药量50公斤/666.7米~2全株喷雾,均匀周到。
The active ingredient of the BT biological preparation is Bacillus thuringiensis spore and crystal spores, which is an efficient and pollution-free microbial pesticide. The crystal protein is fed by sensitive larvae, destroying cell membrane permeability, leading to intestinal paralysis, antifeedant, until the starvation of death. After testing, BT biological agents have a good insecticidal effect on cotton bollworm. Now the test report is as follows: First, the material and methods 1, the test agent (1) BT 1: 500 times 100A / 666.7 m ~ 2. (2) BT 1: 800 times the liquid 65 g / 666.7 m ~ 2. (3) BT 1: 1200 times 40 g / 666.7 m ~ 2. 2, before the treatment of crop cotton, water and fertilizer conditions in the upper, the cotton grow well, bollworm re-occurred, has exceeded the control indicators. Helicoverpa armigera eggs hatch peak to 3 instar larvae before July 5 to 10 spray-spray with a conventional spray, spraying 50 kg / 666.7 m ~ 2 whole plant spray, even thoughtful.