论文部分内容阅读
呋喃虫酰肼是具有类似蜕皮激素作用的昆虫生长调节剂类杀虫剂。为了明确呋喃虫酰肼用于大田害虫防治后对农业生态环境中家蚕安全性的影响,进行了该杀虫剂对家蚕的毒性试验。结果表明,50~1 000 mg/L呋喃虫酰肼药液对家蚕3龄幼虫无熏蒸毒性,但有一定触杀毒性和强烈的胃毒作用。采用食下毒叶法添食呋喃虫酰肼药剂,对2龄起蚕的48 h LC50值为142.095μg/L;对4龄起蚕6 h、24 h的LC50值分别为1.284 mg/L、0.274 mg/L;对5龄起蚕的6 h、24 h的LC50值分别为9.180 mg/L、1.431 mg/L。用LC10以下浓度的呋喃虫酰肼药液给3龄、4龄家蚕幼虫添食后,幼虫未出现蜕皮症状,熟蚕的上蔟时间也未改变。桑树喷洒100 mg/L呋喃虫酰肼药液至湿润,喷药后68 d时采摘桑叶连续24 h饲喂5龄起蚕仍会导致其全部中毒,头胸部出现与眠蚕相似的三角区,部分中毒幼虫的表皮剥落。由于呋喃虫酰肼对家蚕具有强烈的胃毒作用,且在桑叶中的残效期很长,因此该杀虫剂不能用于蚕区及周围的大田与森林害虫防治。
Furazolidinyl hydrazide is an insect growth regulator insecticide with a similar ecdysone effect. In order to clarify the effect of furazolidone hydrazide on the safety of silkworms in agro-ecological environment after field pest control, the toxicity test of the insecticides on silkworms was carried out. The results showed that 50-1000 mg / L of furazolidone hydrazide did not cause fumigation toxicity to 3rd instar silkworm larvae, but had some contact toxicity and strong stomach toxicity. The LC50 value of furazolidone hydrazide was 142.095μg / L for the second instar larvae and the LC50 values of the larvae of the fourth instar larvae were 1.284 mg / L and 0.274 mg / L. The LC50 values at 6 h and 24 h of 5th instar larvae were 9.180 mg / L and 1.431 mg / L, respectively. With LC10 the following concentrations of furazolidone hydrazide solution to the 3rd instar, 4th instar silkworm larvae after feeding, the larvae did not appear molting symptoms, cooked silkworm upper sundial time did not change. Mulberry spraying 100 mg / L furazolidone hydrazide solution to wet, 68 days after spraying pickled mulberry leaves for 24 hours continuous feeding 5-year-old silkworm will still cause all of its poisoning, head and chest appeared similar to the nasopharynx area , Part of the poisoning larvae of the epidermis flake. Since furazolidone hydrazide has a strong stomach toxicity to silkworms and has a long residual period in the mulberry leaves, the insecticide can not be used in the control of silkworm areas and surrounding fields and forest pests.