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《Anhui Agricultural Science Bulletin》 2008-15
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Study on the biological insecticides control to Latoria bicolor(Walker)

Huang Wei-dong (Forestry Bureau of Jiangle County,Fujian Jiangle 353300,China)  
The toxicities of five different concentrations Beauveria bassiana and Bacillus thuringiensis to early 2nd instars larvae of Latoia bicolor were determined in laboratory by dip method.The results showed that the toxicity regressive equation of Beauveria bassiana was y=3.2363+0.2729x,and the values of LC_50 was 2.90×106spores· mL-1.The values of LT_50 of 5×106,5×107,5×108,5×109,5×1010 spores· mL-1 concentrations were 8.62d,7.72d,7.25 d,6.07d and 5.66d,respectively.The toxicity regressive equation of Bacillus thuringiensis was y=3.2889+0.2919x,and the values of LC_50 was 7.28×105ICPs· mL-1.The values of LT50 of 8×106,8×107,8×108,8×109,8×1010 ICPs· mL-1 concentrations were 7.62d,5.87d,4.84d,4.33d and 4.21d,respectively.The best combination biological insecticides was c1b2a3,mixed up with 5000 times of 1% adametim and 20 times of Beauveria bassiana and 3000 times of Bacillus thuringiensis.The best combination biological and chemical insecticides was A1C2B2,mixed up with 8000 times of 20% fenvalerate and 10000 times of 1% adametim and 20 times of Beauveria bassiana.The effects of the c1b3a3 and A1C2B2 were very good to control the larvae in field.
【Fund】: 福建省自然科学基金资助项目(C97033)
【CateGory Index】: S763.7
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