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Toxicity of biocide GCSC-BtA on arthropod pests under different temperature conditions

文献类型： 外文期刊

作者： Zhu, YJ 1 ; Sengonca, C 2 ; Liu, B 2 ;

作者机构： 1.Univ Bonn, Inst Phytopathol, Dept Entomol & Plant Protect, D-53115 Bonn, Germany

2.Univ Bonn, Inst Phytopathol, Dept Entomol & Plant Protect, D-53115 Bonn, Germany; Fujian Acad Agr Sci, Ctr Biotechnol, Fuzhou 350003, Fujian, Peoples R China

关键词： GCSC-BtA;Toxicity;Tetranychus cinnabarinus;Frankliniella occidenttalis;Aphis fabae;Plutella xylostella;Cameraria ohridella;Developmental stage;Temperature

期刊名称：JOURNAL OF PEST SCIENCE （ 影响因子：5.918； 五年影响因子：5.955 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The present research dealt with the toxicity of GCSC-BtA (Germany-China Scientific Cooperation-Bacillus thuringiensis-Abamectin), a new type biocide developed by conjugating a toxin from Bacillus thurin-giensis (B.t.) with Abamectin from Streptomycesaver-mitilis, on arthropod pests under different temperature conditions. The results showed that GCSC-BtA possessed higher toxicity than B.t. crystal, Abamectin or Cypermethrin, with pest mortalities of 97.9, 93.7, 96.4, 82.3 and 96.7% for Tetranychus cinnabarinus (Boisd.) (Acari, Tetranychidae), Frankliniella occidentalis Pergande (Thys., Thripidae), Aphis fabae Scopoli (Horn., Aphididae), Plutella xylostella (L.) (Lep., Plutellidae) and Carrier aria ohridella Deschka et Dimic (Lep., Gracillariidae), respectively. Toxicities of GCSC-BtA to T. cinnabarinus and P. xylostella decreased significantly at the older developmental stage with an exception that egg stage had the highest tolerance, in which LC_(50)s of GCSC-BtA were 0.0001, 0.0019 and 0.0708 mg/ml for nymph, adult and egg of T. cinnabarinus, and that 0.0399, 0.2035 and 0.9033 mg/ml for the 2nd instar larvae, 4th instar larvae and egg of P. xylostella, respectively. Also, the biocide was more effective to the lower stage of A. fabae than the higher one with LC_(50)s of 0.0023, 0.0086 and 0.0171 mg/ml against 1st instar nymph, 3rd instar nymph and adult, respectively. In general, toxicity of the new type of biocide was positively related to temperature against all the tested pests, except against T. cinnabarinus, where it was almost similar at the three temperature conditions. GCSC-BtA displayed significantly lower toxicities at 15/20°C than 20/25°C or25/30°C against F. occidentalis, A. fabae, P. xylostella and C. ohridella. However, no significant difference was found in the toxicities against F. occidentalis, A. fabae and C. ohridella above 20°C, whereas toxicity against P. xylostella increased astemperature raised. Therefore, to achieve higher efficacy in the field, application rate and time should be devised according to these factors.

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