Relative effectiveness of eight insecticides in controlling adult Galeruca reichardti
Author of the article:WU Hai-Bin1** GENG Hai-Rong2 GONG Qing-Tao1ZHANG Kun-Peng1 SUN Rui-Hong1***
Author's Workplace:1. Shandong Institute of Pomology, Shandong Province, Tai’an 271000, China; 2. Institute of Agro-Products Processing Science and Technology, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Key Words:Galeruca reichardti, insecticide, toxicity, efficacy
Abstract:
[Objectives] To explore appropriate pesticide bioassay methods and select effective insecticides for the control of adult Galeruca reichardti. [Methods] The toxicities of eight pesticides to G. reichardti were determined by the insectdipping and leafdipping tests, and by the contact and ingestion methods. The effectiveness of control was assessed by a field experiment. [Results] The relative toxicity of the pesticides varied according to the test used. Pyrethrin was the most toxic with respect to the insectdipping test, however, on the basis of the leafdipping, contact and ingestion methods, sulfoxaflor was the most toxic with LC50 values of 68.24, 111.11 and 67.94 mg/L, respectively. The toxicity of pyrethrin with respect to the insectdipping, contact and ingestion methods was respectively 28.97 and 17.83 times that in the leafdipping test. Cnidium monnieri and matrine had the lowest toxicities in every bioassay. The results of the field experiment showed that application of 50% sulfoxaflor water dispersible granules at a density of 562.5 g/hm2 reduced pest abundance by 94.90 %, and reduced damage to Chinese chive seedlings by 81.45%; significantly better than the results achieved with the other pesticides. [Conclusion] Although all three bioassay methods can be used to determine the toxicity of insecticides, the contact and ingestion methods should become the standard bioassays. Of the pesticides tested, sulfoxaflor was the best for controlling G. reichardti in Chinese chive crops.