摘要： 为探索辣椒疫病的发生发展规律,对带菌土壤和带菌种子进行传病试验研究,从而为病害的早期检测及综合防治提供依据。采用拌土法及注射法分别对土壤和辣椒果实接种辣椒疫霉菌,接种后对菌土中种植的辣椒植株发病情况、土壤中病原菌的存活及辣椒种子带菌、带菌种子传病情况进行调查研究。菌土中种植的辣椒植株在生长期持续的发生疫病,105 d时发病率稳定,但此时土壤中的疫霉菌依然存活;辣椒果实注射接种疫霉菌孢子悬浮液后,能使种子感染疫霉菌,显著降低发芽率和出苗率,出土的幼苗在苗期生长阶段会发生疫病。结果表明,带菌土壤和带菌种子都是辣椒疫病的主要初侵染来源及重要的传播途径。

关键词: 辣椒, 疫病, 初侵染来源, 传播途径

Abstract: To probe into the occurring and developing regularities of Phytophthora capsici in pepper,we studied the transmission of Phytophthora capsici in pepper in soil and seeds in this paper.They can provide a basis for early detection and disease control.We mixed soil with Phytophthora capsici and injected sporangia to pepper fruit.We investigated the disease index of pepper plants grown in the soil and the living rate of pathogen in the soil.At the same time,our another aim was to confirm if seeds can be infected when the pepper fruits were inoculated with pathogen,and if the infected seeds can transmit the disease.Pepper plants grown in the soil were continued happen Phytophthora capsici at the growth period,and the disease incidence of pepper plants became steady in 105 days,meanwhile,Phytophthora capsici in the soil was still alive;we injected sporangia to pepper fruits,which can infect the seed and significantly reduced the germination and emergence rate and the seedling will sustainability happen Phytophthora capsici at the whole growth stage.The results showed that Phytophthora capsici in pepper was mainly transmitted by the soil and seed which naturally infected by pathogen.

Key words: Pepper, Phytophthora capsici, Initial infection source, Transmission pathway

中图分类号: 

• S436.418