Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (9): 2659-2665.DOI: 10.3969/j.issn.1000-2561.2021.09.030

• Plant Protection & Bio-safety • Previous Articles     Next Articles

Pathogen Identification for the New Leaf Spot Disease of Capsicum annuum L. and Its Biological Characteristics

PEI Yueling, SUN Yanfang, FENG Tuizi, CHEN Yuan, LONG Haibo*()   

  1. Environment and Plant Protection Institute, Chinese Academy of Tropical Agriculture Sciences / Key Laboratory of Integrated Pest Management on Tropical Crops, Ministry of Agriculture and Rural Affairs / Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou, Hainan 571101, China
  • Received:2020-09-01 Revised:2021-01-12 Online:2021-09-25 Published:2021-11-01
  • Contact: LONG Haibo

Abstract:

A new leaf spot disease was firstly observed during a survey from 2015—2019 in Capsicμm annuμm field of Hainan Province, which was different with other common leaf diseases. The sample was collected and the pathogen was isolated. The results of microscopic examination and molecular analysis confirmed that the disease was caused by Curvularia lunata (Wakker) Boedijin, which was the first report of the Capsicum disease caused by C. lunata in China. The optimum condition for mycelial growth was 30 ℃, pH 7, light or alternative light, D-maltose and yeast extract, while the optimum temperature for conidia germination was 22-33 ℃ and the lethal temperature for conidia was 60 ℃ for 10 min. 12 fungicides were screened in laboratory, 45% Prochloraz EW was found to have the best inhibition activity against the pathogen, which had 97.8% inhibition when the concentration was 1.0 mg/L, 16% diethofencarb 10% pyrimethanil WP, 25% triadimefon WP, 65% Tiezene WP and 80% Mancozeb WP were also effective, while 70% Thiophanate-methyl and 80% carbendazim were almost futile.

Key words: Capsicum annuum L, Curvularia lunata, biological characteristics, fungicide screening

CLC Number: