Effect evaluation of liquid plant protection film in controlling Bactrocera cucurbitae
[Background] The melon fly Bactrocera cucurbitae, which is an important quarantine pest worldwide, has distributed in tropical and subtropical region in China. We evaluated the control efficiency of liquid plant protection film on B. cucurbitae in labora-tory and field. From these preliminary results, we explored the mode of action of protection film can provide technical support for control of B. cucurbitae.[Method] The oviposition and survival of B. cucurbitae and damage rate of Momordica charantia were evalu-ated after spraying the protection film of different doses. [Result] The results showed that the protection film significantly affected the oviposition, survival and selectivity of B. cucurbitae. The fecundity and survival of B. cucurbitae decreased with the increase of the application rate of protection film. There were no significant differences between solutions concentrated at 300× and 400×. The lowest fecundity (0.33 egg) and highest mortality (50%) were observed at solution concentrated 400×. The data also indicated that the protection film could persistently suppress the oviposition of B. cucurbitae for five days. The protection film did not significantly suppress the fecundity of B. cucurbitae on injured bitter gourd treated with the protection film. In the field, the length of bitter gourd has effect on the control. The damage rates of 12~14 cm gourd were lower than those of 6~8 cm gourd after spraying the protection film. [Conclusion and significance] Based on these results, protection film at a 400 × concentration was the optimum application concentration for control of B. cucurbitae, once every four days. The optimum application period was during the late gourd develop-ment i.e. at length of 12~14 cm. The protection film should be applied evenly on gourds. The injured host fruits were not suitable for applying the protection film.
国家科技期刊平台
NSTL
万方数据
维普
