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Impacts of 2 species of predatory Reduviidae on bagworms in oil palm plantations

Insect Science 2017年第2期24卷 285-294页

作者： Syari Jamian Ahmad Norhisham Amal Ghazali Azlina Zakaria Badrul Azhar Faculty of Agriculture Universiti Putra Malaysia Serdang Selangor Malaysia Cardiff School of Biosciences Cardiff University Cardiff Wales UK Faculty of Forestry Universiti Putra Malaysia Serdang Selangor Malaysia Sime Darby Research Sdn. Bhd. Banting Selangor Malaysia Biodiversity Unit Institute of Bioscience Universiti Putra Malaysia Serdang Selangor Malaysia

Integrated pest management （IPM） is widely practiced in commercial oil palm agriculture. This management system is intended to minimize the number of attacks by pest insects such as bagworms on crops, as well as curb economic loss with less dependency on chemical pesticides. One practice in IPM is the use of biological control agents such as predatory insects. In this study, we assessed the response of predatory natural enemies to pest outbreak and water stress, and document the habitat associations of potential pest predators. The abundances of 2 predatory insect species, namely Sycanus dichotomus and Cosmolestes pictieeps （Hemiptera： Reduviidae）, were compared bagworm outbreak sites and nonoutbreak sites within oil palm plantations. We also examined habitat characteristics that influence the abundances of both predatory species. We found that the abundance of C. picticeps was significantly higher in bagworm outbreak sites than in nonoutbreak sites. There were no significant differences in the abundance ofS. dichotomus among outbreak and non-outbreak sites. Both species responded negatively to water stress in oil palm plantations. Concerning the relationship between predatory insect abundance and in situ habitat quality characteristics, our models explained 46.36% of variation for C. picticeps and 23.17% of variation for S. dichotomus. Both species of predatory insects thrived from the planting of multiple beneficial plants in oil palm plantations. The results suggest that C. picticeps can be used as a biological agent to control bagworm populations in oil palm plantations, but S. dichotomus has no or little potential for such ecosystem service.

关键词： bagworms beneficial plants biological control habitat quality integratedpest management oil palm predatory insects

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Heat-induced mortality and expression of heat shock proteins in Colorado potato beetles treated with imidacloprid

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Insect Science 2016年第4期23卷 548-554页

作者： Jie Chen Ai Kitazumi Jasper Alpuerto Andrei Alyokhin Benildo de los Reyes School of Biology and Ecology University of Maine Orono ME 04469 USA Department of Entomology LouisianaState University Baton Rouge LA 70803 USA.

The Colorado potato beetle is an important pest of solanaceous plants in the Northern Hemisphere. Better understanding of its physiological responses to temperature stress and their interactions with still-prevalent chemical control has important implications for the management of this insect. We measured mortality and expression of the Hsp70 heat shock proteins in the Colorado potato beetle larvae exposed to sublethal concentration of the commonly used insecticide imidacloprid, and to supraoptimal temperatures. Both turned out to be significant stress factors, although induction of Hsp70 by imidacloprid observed in the present study was low compared to its induction by the heat. The two factors also interacted with each other. At an extreme temperature of 43 ~C, exposure to a sublethal dose of imidacloprid resulted in a significant rise in larval mortality, which was not observed at an optimal temperature of 25 ~C. Heat-stressed larvae also failed to respond to imidacloprid by producing more Hsp70. These findings suggest that when field rates of insecticides become insufficient for killing the exposed beetles under optimal temperature conditions due to the evolution of resistance in beetle populations, they may still reduce the probability of resistant beetles surviving the heat shock created by using propane flamers as a rescue treatment.

关键词： chemical stress climate change heat stress insecticide resistance integratedpest management Leptinotarsa decemlineata (Say)

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