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journal1 ›› 2016, Vol. 32 ›› Issue (6): 749-755.DOI: 10.16409/j.cnki.2095-039x.2016.06.011

• RESEARCH REPORTS • Previous Articles     Next Articles

Compatibility of Beauveria bassiana with 11 Chemical Fungicides under Laboratory Conditions

CAO Weiping, SONG Jian, ZHAO Jianjiang, FENG Shuliang, DU Lixin   

  1. IPM Center of Hebei Province/Key Laboratory of Integrated Pest Management on Crops in Northern Region of North China, Ministry of Agriculture/Institute of Plant Protection, Hebei Academy of Agricultural and Forestry Sciences, Baoding 071000, China
  • Received:2016-05-06 Online:2016-12-08 Published:2016-12-07

Abstract: Effects of 11 chemical fungicides commonly used in the field on spore germination, growth rate, spore production, the extracellular protease and pathogenecity of Beauveria bassiana strain HFW-05 were determined under laboratory conditions. Almost all the tested fungicides significantly inhibited spore germination, mycelium growth, spore production and enzymatic activity at conventional concentrations. Among them, 68.75% fluopicolide propamocab hydrochloride and 50% boscalid didn't show negative effect on mycelium growth or spore germination at conventional concentrations. The 60% yl-ethyl metiram showed the highest inhibition against HFW-05 with no spore germination or mycelium growth at three test concentrations. The inhibition by most of the fungicides is concentration dependent. Bioassay results showed that 42.4% fluxapyroxad, 10% difenoconazole and 50% fludioxonil did not reduce activity of HFW-05 against Plutella xylostella 2nd instar larvae. But 25% mandipropamid, 50% boscalid, 50% dimethomorph, 68.75% fluopicolide propamocab hydrochloride, 50% kresoxim-methyl, 60% yl-ethyl metiram and 32.5% difenoconazole azoxystrobin significantly reduced the efficacy against P. xylostella larvae. 60% yl-ethyl metiram was the most harmful chemical fungicide to HFW-05, which reduced the corrected mortality of P. xylostella larvae by 49.9% in comparison with that obtained with HFW-05 only. 25% pyraclostrobin showed insecticidal activity to P. xylostella larvae with corrected mortality of 46.2%, which was increased by 20% when pyraclostrobin was mixed with HFW-05.

Key words: Beauveria bassiana, chemical fungicide, compatibility, Plutella xylostella

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