Sensitivity of Colletotrichum gloeosporioides species complex (CGSC) isolated from strawberry in Taiwan to benzimidazole and strobilurin
Journal
Journal of Pesticide Science
Journal Volume
47
Journal Issue
4
Pages
172-183
Date Issued
2022-11
Author(s)
Abstract
Colletotrichum gloeosporioides species complex (CGSC) is the major pathogen caus-ing strawberry anthracnose in Taiwan. Benzimidazoles and strobilurins are common fungicides used to control strawberry anthracnose. A total of 108 CGSC isolates were collected from five major strawberry-producing areas in Taiwan. The half-maximal ef-fective concentration (EC50) values of most CGSC isolates for benomyl (59 isolates), car-bendazim (70 isolates), and thiabendazole (63 isolates) were higher than 500 mu g a.i./mL. Strobilurin tests showed that the EC50 values of most CGSC isolates for azoxystrobin (66 isolates), kresoxim-methyl (42 isolates), and trifloxystrobin (56 isolates) were higher than 500 mu g a.i./mL. However, most CGSC isolates were sensitive to pyraclostrobin at 100 mu g a.i./mL. Fungicide tests indicated that CGSC isolates show multi-resistance to benzimidazoles and strobilurins. Benzimidazole-resistant isolates were associated with a point mutation in codon 198 of the beta-tubulin gene, and strobilurin-resistant isolates did not correspond with mutation in the cyt b gene or alternative oxidase activity.
Subjects
anthracnose
fungicide-resistance
mechanisms
multi-resistance
Publisher
Pesticide Science Society of Japan
Type
journal article