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Joint toxicity of Beauveria bassiana and two insect growth regulators,methoxyfenozide and hexaflumuron,on beet armyworm larvae,Spodoptera exigua(Hübner),were investigated.An obvious synergism effect of the two insect growth regulators with B.beauveria was observed.When the insect growth regulators at LC_(50) concentrations(25×10~(-6)g/L for methoxyfenozide and 1 000×10~(-6) g/L for hexaflumuron)were mixed with B.bassiana at the volume ratio of 4∶1,the mixtures achieved the best efficacy.The co-toxicity co-efficient(CTC)of methoxyfenozide and B.bassiana was 285,and that of hexaflumuron and B.bassiana was 208.Scanning electron microscope observation of the longitudinal section of S.exigua revealed obviously different patterns of integument in different treatment groups.
Joint toxicity of Beauveria bassiana and two insect growth regulators, methoxyfenozide and hexaflumuron, on beet armyworm larvae, Spodoptera exigua (Hübner), were investigated. An obvious synergism effect of the two insect growth regulators with B. beauveria was observed. regulators at LC_ (50) concentrations (25 × 10 ~ (-6) g / L for methoxyfenozide and 1 × 10 ~ (-6) g / L for hexaflumuron were mixed with B. bassiana at the volume ratio of 4: 1, the mixtures achieved the best efficacy. The co-toxicity co-efficient (CTC) of methoxyfenozide and B. bassiana was 285, and that of hexaflumuron and B. bassiana was 208. Scanning electron microscope observation of the longitudinal section of S. exigua revealed obviously different patterns of integument in different treatment groups.