Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (3): 552-557.DOI: 10.3969/j.issn.1000-2561.2019.03.020

• Crop Pests, Diseases and Their Control, Environmental Protection • Previous Articles     Next Articles

Pathogen Identification and Fungicide-screening of the Peanut Black Rot

LI Na,WANG Zetian,HE Guibi,XIANG Meimei,ZHANG Yunxia()   

  1. Department of Plant Protection, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, China
  • Received:2018-07-03 Revised:2018-11-08 Online:2019-03-15 Published:2019-03-15
  • Contact: ZHANG Yunxia


Peanut black rot is an severe disease on peanuts, which has a serious impact on production. It is also a quarantine plant disease in China. To identify the pathogen of peanut rot and get the effective fungicide which can inhibit the mycelium growth of the pathogen, the pathogen of peanut black rot was identified by colony characteristics, morphological characteristics and DNA sequence analysis. The inhibitory effect of 8 fungicides on C. iliciola was determined by the mycelium growth rate method. The results showed that the pathogen of peanut black rot was Calonectria iliciola. 10% Tebuconazole was the best fungicide to inhibit the mycelium growth of C. iliciola, and the EC50 value was 1.12 μg/mL. 300 g/L Difenoconazole·propiconazol EC, 29% isopyrazam·azoxystrobin SC, 25% Fludioxonil SC, 15% pyraclostrobin SC and 22.5% picoxystrobin could inhibit SC the mycelium growth of C. iliciola, and the EC50 value was under 10 μg/mL. 30% metalaxy-hymexazol was the worst fungicide to the mycelium growth of C. iliciola and the EC50 value was 76.71 μg/mL. The results above could provide a theoretical basis for the prevention and control of black rot of peanut.

Key words: peanut, black rot, fungicide, toxicity test