Plant Protect. Sci., 2002, 38(11):684-687 | DOI: 10.17221/10590-PPS

Practical experience with antiresistance strategies in the fungicides control of potato late blight

P. Doležal, E. Hausvater, V. Táborský
1 Potato Research Institute, 580 01 Havlíčkův Brod, Czech Republic
2 Department of Plant Protection, Czech University of Agriculture Prague, 165 21 Prague-Suchdol, Czech Republic E-mail: dolezal@vub.hb.cz

Pathogens with rapid reproductive cycles, producing large number wind-spread dispersed infection propagules like sporangiospores, are more likely to pose problems of resistance than slowly reproducing pathogens, which are dispersed over only short distances. Phytophthora infestans, is highly adaptable pathogen capable of exerting high disease pressure on crop, and develop resistance to phenylamid fungicide methalaxyl in the potato crop in Europe (1981-1984). Metalaxyl was then reintroduced for use in mixtures coformulated with multisite compounds, and the proportion of resistance strains "subpopulations" rose again, and albeit to a level lower than at the outset. The use of metalaxyl on seed crops, with the possibility of resistance being carried over the next season. Current recommendations are to use alternative multiside fungicides on potato crops. Our results illustrate the importance of understanding pathogen epidemiology in the management of fungicide resistance.

Keywords: chemical control; Phytophthora infestans; cost, benefits

Published: December 31, 2002  Show citation

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Doležal P, Hausvater E, Táborský V. Practical experience with antiresistance strategies in the fungicides control of potato late blight. Plant Protect. Sci. 2002;38(SI 2 - 6th Conf EFPP):684-687. doi: 10.17221/10590-PPS.
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