Difference between isolates from brown eye spot and black spot lesions in coffee plants

Abstract: The objective of this work was to evaluate the difference between the isolates from two cercospora leaf spot symptoms (brown eye spot and black spot) in relation to conidial morphology, mycelial growth, cercosporin production, and reproduction of symptoms in coffee leaves collected in three municipalities in the state of Minas Gerais, Brazil. There was a difference between the isolates for the studied variables, but without any relation to the type of symptom. The differences found were not associated with the origin of the isolates. The symptoms characterized as black spot were associated with different host conditions during the infection process.

摘要：本研究旨在比较源自两种尾孢叶斑病症状（棕眼斑病与黑斑病）的菌株，在分生孢子形态、菌丝生长、尾孢菌素(cercosporin)产生以及咖啡叶片症状再现能力方面的差异，供试材料为采集自巴西米纳斯吉拉斯州3个市镇的咖啡叶片。供试菌株在各观测变量上均存在差异，但该差异与症状类型无关。所发现的差异亦与菌株的分离来源无关联。表征为黑斑病的症状，在侵染过程中与不同的宿主条件存在相关性。