摘要
为得到杀二斑叶螨Tetranychus urticae(Koch,1836)高致死率的环链棒束孢Isaria cateniannulata(Z.Q.Liang)Samson&Hywel-Jones菌株,明确其最优菌株对尼氏真绥螨Euseius nicholsi(Ehara et Lee)存活率的影响,本文在室内用17株环链棒束孢菌株芽孢子和分生孢子对二斑叶螨雌成螨进行了致死率测定,并研究了最优菌株对尼氏真绥螨雌成螨存活率的影响。结果表明,13号菌株芽孢子的LT50为1.472 d,17号菌株的分生孢子的LT50为3.248 d,时间明显短于其他菌株,致死率明显高于其他菌株;该2个菌株处理尼氏真绥螨,在芽孢子和分生孢子浓度为2×108个/mL时,存活率分别为80.75%和70.75%。因此,在芽孢子和分生孢子浓度为2×107个/mL及以下时,环链棒束孢和尼氏真绥螨可以同时施用。
To get the highly virulent strain of Isaria cateniannulata against Tetranychus urticae and the influence of Euseius nicholsi＇s survive rate, the present study respectively examined the mites＇ martality treated by the blastospores and the conidia of 17 I. cateniannulata strains and the survive rate of the predatoty in the laboratory. The result showed that the blastospores of No. 13 and the conidia of No. 17 spent the least time on obtaining the highest mortality of T. urticae, LD50 of the two strains were 1. 472 d and 3. 248 d respectively. Meanwhile, the two strains were used to against E. nicholsi at 2× 108spore/ mL, the survival rates were 80.75% and 70.75% respectively. Therefore I. Cateniannulata and E. nicholsi were used to control T. urticae simultaneously under 2 × 107spore/mL of the blastospores and conidia.
出处
《环境昆虫学报》
CSCD
北大核心
2014年第3期372-380,共9页
Journal of Environmental Entomology
基金
国家公益性行业(农业)科研专项(201103020)
贵州大学研究生创新基金(研农2013016)
贵州省农业攻关项目(黔科合NY[2013]3043号)
关键词
环链棒束孢
尼氏真绥螨
二斑叶螨
致死率
存活率
Isaria cateniannulata
Euseius nicholsi
Tetranychus urticae
mortality
survival rate
