Effect of Chemical Treatment on the Control of Strawberry Anthracnose caused by Colletotrichum sp.

Kim, Seung Han; Choi, Sung Yong; Lim, Yang Sook; Yoon, Jae Tak; Choi, Boo Sull

Research in Plant Disease 2002;8(1):50-54.
Published online March 30, 2002.

딸기탄저병의 약제방제효과

김승한, 최성용, 임양숙, 윤재탁, 최부술

Effect of Chemical Treatment on the Control of Strawberry Anthracnose caused by Colletotrichum sp.

Seung Han Kim, Sung Yong Choi, Yang Sook Lim, Jae Tak Yoon, Boo Sull Choi

Abstract

A total of 55 Colletotrichum isolates from strawberry plants with anthracnose symptoms(crown rot) were inhibited in mycelial growth on potato-dextrose agar(PDA) amended with fungicides in variable degrees depending on the chemicals used, especially showing no growth on PDA with 1 mg/ml tricyclazole. However, in the detached leaf test by treating chemicals before or after inoculation of Colletotrichum sp., tricyclazole was little effective in controlling symptom development; instead azoxystrobin, which had low in vitro inhibition of mycelial growth, inhibited strongly the symptom development. Some chemicals were tested for the control of strawberry crown rot in greenhouse using three methods, spray, soil drenching, and plant dipping. No or little control effect were made by chemical spray and soil drenching, but plant dipping in chemical solution, especially azoxystrobin, reduced crown rot development by about 50% in the greenhouse suggesting that the azoxystrobin treatment may be an effective control method of the crown rot of strawberry. No differences in the control efficacy were noted according to the dipping time and chemical concentration of azoxystrobin not less than 10 min and 250 mg/ml, respectively.

Key Words: anthracnose, azoxystrobin, strawberry