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Study on Biological Characteristics and toxicity determination of Colletotrichum orbiculare Causing Anthracnose of Watermelon in Hainan Province

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Plant Diseases and Pests 2012年第1期3卷 5-9页

作者： ZHOU Wen-jing FAN Hong-yan HE Fan WANG Yun-qin College of Environmental and Plant Protection Hainan UniversityDanzhou 571737China Institute of Tropical Fruit Trees Hainan Academy of Agricultural SciencesHaikou 571100China Haikou Scientific Observation and Experiment Station of Tropical Fruits Ministry of AgricultureHaikou 571100China

[Objective] This paper was aimed to study the biological characteristics of Colletotrichum orbiculare（*** Mont.） Arx, and accomplish the preliminary screening the test of fungicides. [Method]The pathogen was isolated from the infected leaves of watermelon collected from greenhouse in Hainan Province. The biological characteristics of C. orbiculare and indoor toxicity of fungicides were studied. [Results] The mycelium grew fastest on the medium with leaf extract of watermelon. The optimum temperature for mycelial growth and spore germination was 28 and 30 ℃, and the optimum pH was 7-9 and 6-8, respectively. The continuous darkness condition was most suitable for mycelial growth. The lethal temperature of spore was 55 ℃ water bath for 10 min in water bath. The suitable carbon sources were maltose, L-arabinose and glucose, and the suitable nitrogen sources were yeast extract, beef extract and peptone. In the indoor toxicity determination, 32.5% Benzoic azoxystrobin SC, 50% Dichlorotetrakis WP and 10% Difenoconazole WG showed better inhibition effects against the mycelial growth of C. orbiculare, with the EC50 values of 0.018 0, 0.060 2 and 0.471 5 μg/ml, respectively. [Conclusion]The research provided theoretical basis for the control of watermelon anthracnose in watermelon fields.

关键词： Watermelon Colletotrichum orbiculare(Berk.et Mont.) Arx Biological characteristics Fungicides indoor toxicity determination China

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