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Bt是苏云金杆菌学名Baiilusthuringensisttt的缩写，其产生的伴孢晶体具有杀虫活性[1]。1997年7月14日至23日田间应用Bt杀虫剂防治棉铃虫，5天防效达64．6％，7天防效达14．4％。一种昆虫生长调节剂RH－5849的5天防效为32．9％，7天防效仍为32．9％。将Bt和RH－5849复配制成复方生物农药BR[2]，第5天防效达68．3％，7天防效达65．4％；单一使用化学农药久效磷5天防效为31．3％，7天防效为67．8％，两者效果相当。
Bt Bacillus thuringiensis is a scientific name Baiilusthuringensisttt acronym, produced by the spore crystal with insecticidal activity [1]. From July 14 to July 23, 1997, Bt insecticide was used to control cotton bollworm in the field. The control effect reached 64.6% in 5 days and 14.4% in 7 days. One insect growth regulator, RH-5849, had a 5-day control of 32.9% and a 7-day control of 32.9%. Bt and RH-5849 complex formulated into compound biopesticide BR [2], the first 5 days of anti-68.3%, 7 days of anti-65.4% effect; single use of chemical pesticide monocrotophos 5 days control effect 31.3%, 7-day control effect was 67.8%, both of the same effect.