Assessment of the baseline sensitivity and resistance risk of Colletotrichum acutatum to fludioxonil View Full Text


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Article Info

DATE

2017-07-27

AUTHORS

Yangyang Gao, Lifei He, Wei Mu, Beixing Li, Jin Lin, Feng Liu

ABSTRACT

Anthracnose, which is caused by Colletotrichum acutatum, is a destructive disease of pepper. A preliminary study demonstrated that fludioxonil (a phenylpyrrole fungicide) has good activity against C. acutatum and thus has potential to be used as an alternative fungicide for the management of pepper anthracnose. However, there is no information regarding the baseline sensitivity and resistance risk of C. acutatum to fludioxonil. Thus, the sensitivities of 205 isolates of C. acutatum to fludioxonil were determined. The results showed that the frequency distributions of the EC50 values were unimodal, and the mean EC50 values for the inhibition of mycelial growth and spore germination were 0.031 μg/mL and 0.035 μg/mL, respectively. Three stable mutants with high resistance to fludioxonil were obtained in the laboratory. Two parameters, namely in vitro sporulation and the in vitro and in vivo germination of spores, showed significant difference (P < 0.01) when the mutants were compared to the sensitive isolates. Moreover, the mutants were more sensitive to osmotic stress compared to the parents. No significant differences (P ≥ 0.05) were detected in colony diameter, mycelia weight, pathogenicity or sporulation in vivo between the fludioxonil-resistant mutants and their corresponding parents. Cross-resistance occurred between fludioxonil, iprodione and procymidone. Overall, resistance risk of C. acutatum to fludioxonil was low to medium, and thus resistance management should be considered. More... »

PAGES

639-651

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10658-017-1309-3

DOI

http://dx.doi.org/10.1007/s10658-017-1309-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1090915398


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