球孢白僵菌Bb378不同施用方式对大豆促生及诱导抗甜菜夜蛾的增效作用

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effectonsoybeanandtheeffectsofitssymbiotic relationship with soybean on the feeding behavior of S exiguaby seed soaking，root irrigation and foliar spraying methods.The results showed that the cumulative corrected mortality ofthethird instarlarvaewas 56.92% after 14 days of Bb378 treatment，and the LC50 was 3.7×107 （24 CFU/mL.When the content of Bb378 spore suspension was 1×108 CFU/mL，seed soaking and root irrigation

treatments hadobvious effectson plant height，leaf area and fresh weight of soybean，partof which were significant increased compared with the control. When the suspension contents of Bb378 were 1×107 CFU/mL and 1×106 CFU/mL ，respectively，foliarspraying hadthegreatest efectonleafarea（thetwenty-firstdayaftertheseedlingswerealigned）and fresh weight of soybean，respectively. In addition，when the contents of Bb378 were 1×108 CFU/mL and 1×107 CFU/mL， treatments of seed soaking，rotirrigationand foliar spraying had good repellent efect on the newly hatched larvae of S .exiguaontewhole，whiletreatmentsofseedsoakingandrootirigationhadsignificantrepellntefectonthethirdinstarlarvae of S exigua.The results showed that B .bassiana Bb378 could promote soybean growth after inoculation，and the B bassiana-soybeansymbiont hadarepelant efectonS.exigua，which provided technicalsupportforthe furtherapplication of B . bassiana insecticide in the field.

KeyWords：Beauveria bassiana；soybean；growth-promoting；repellant；Spodoptera exigu

球孢白僵菌（Beauveriabassiana）是最早被发现和认识的一类昆虫病原真菌，是昆虫种群的天然“杀手”，可感染700多种昆虫，兼有环境友好、易规模化生产等优点，已被开发并广泛使用[1-2]。（剩余12194字）