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Effects of some fungicides on Isaria farinosa, and in vitro growth and infection rate on Planococcus citri

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Abstract

The effects of some fungicides used against citrus diseases, on mycelial growth and conidial germination of Isaria farinosa (Holmsk.) Fries [Sordariomycetes: Hypocreales] and also on the pathogenicity of the fungus on citrus mealybug, Planococcus citri (Risso), were determined. Systemic fungicides such as tebuconazole, penconazole and nuarimol were the most effective as regards both conidial germination and mycelial growth. Protective fungicides such as captan, chlorothalonil, mancozeb and propineb inhibited conidial germination at between 1 and 5 μg ml−1 concentration, but captan, chlorothalonil and propineb did not inhibit the mycelial growth at 5,000 μg ml−1. Mancozeb inhibited mycelial growth between 2,500 and 5,000 μg ml−1. Sulphur and copper oxychloride did not inhibit the fungus even at very high concentrations. Sulphur, copper oxychloride, fosetyl-al, chlorothalonil and carbendazim did not decrease the mortality percentage caused by I. farinosa. Tebuconazole, penconazole and mancozeb were the most effective and respectively reduced the mortality from 83% to 33%, 28% and 30% in the ovisacs, from 81% to 29%, 27% and 29% in the 1st instar larvae, and from 84% to 34% in the adult females.

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Acknowledgments

This research was supported by TUBİTAK (The Scientific and Technological Research Council of Turkey) (Project no. 104 O 200). The authors are grateful to Dr. Richard Humber (USDA–ARS Biological Integrated Pest Management Unit) for his kind help in the identification of Isaria farinosa.

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Authors and Affiliations

  1. Department of Plant Protection, Faculty of Agriculture, University of Ankara, Ankara, Turkey

    Fikret Demirci, Murat Muştu & Selma Ülgentürk

  2. Department of Plant Protection, Faculty of Agriculture, Yüzüncü Yıl University, Van, Turkey

    M. Bora Kaydan

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  1. Fikret Demirci
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  2. Murat Muştu
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  3. M. Bora Kaydan
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  4. Selma Ülgentürk
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Correspondence to Fikret Demirci.

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Demirci, F., Muştu, M., Kaydan, M.B. et al. Effects of some fungicides on Isaria farinosa, and in vitro growth and infection rate on Planococcus citri . Phytoparasitica 39, 353–360 (2011). https://doi.org/10.1007/s12600-011-0168-2

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