摘要
经Bt 2× 10 7、 4× 10 7、 6× 10 7、 8× 10 7、 1× 10 8孢子 /mL5种浓度对 4龄文山松毛虫的室内生测 ,筛选出松毛虫死亡率达 70 %的最佳浓度为 2 0× 10 7孢子 /mL ;以此浓度的Bt与DCPV复配试验 ,选择残存虫DCPV感染率 5 0 %的DCPV最低浓度为 6 0× 10 5PIB/mL。林间应用最适的Bt +DCPV复配浓度是 6 0× 10 7孢子 /mL +4 0× 10 5PIB/mL ,其防治效果为 82 0 8%。
Bioassay of five concentration Bt, 2 ×10 7 spores/mL, 4 ×10 7 spores/mL, 6 ×10 7 spores/mL, 8 ×10 7 spores/mL, 1 ×10 8 spores/mL, on period 4 Dendrolimus punctatus wenshanensis, was conducted The results showed that the optimum concentration which cause the death rate of 70% was 2×10 7 spores/mL Test were also conducted to reveal the appropriate concentration of DCPV in compound microbiological pesticide, the results indicated the lowest concentration of DCPV causing 50% infection rate of the remain pest was 6 0 ×10 5 PIB/mL The optimum compound concentration Bt+DCPV was 6 0×10 7 spores/mL+4 0×10 5 PIB/mL, the control effect was 82 08%
出处
《云南林业科技》
2002年第1期56-60,共5页
Yunnan Forestry Science and Technology
关键词
Bt-DCPV复合微生物杀虫剂
文山松毛虫
防治
Bacillus thuringiensis (Bt)
cytoplasmic polyhedrosis virus (CPV)
Dendrolimus punctatus wenshanensis
compound microbiological pesticide
