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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。
In order to obtain a high lethality strain Samson & Hywel-Jones strain of Isaria cateniannulata (ZQLiang) Tetranychus urticae (Koch, 1836), its optimal strain was identified as Euseius nicholsi Lee) survival rate of the indoor indoors with 17 strains of the genus Link chain spores conidia and conidia of two-spotted spider mite female adult mites were tested for lethality and studied the best strains of Nisi Shinsei Effect of mite female mite survival rate. The results showed that the LT50 of spores of strain 13 was 1.472 days, and the LT50 of conidia of strain 17 was 3.248 days, which was significantly shorter than other strains and the lethality was significantly higher than those of other strains. When the spore and conidia concentration was 2 × 108 cells / mL, the survival rates of A. muskmelon were 80.75% and 70.75%, respectively. Therefore, when the concentration of spore and conidia is 2 * 10 <7> / mL and below, C. obliquus and A. niger may be administered simultaneously.