Aggressiveness of Phytophthora infestans populations in western Algeria
Paper Details
Aggressiveness of Phytophthora infestans populations in western Algeria
Abstract
The present work has shown that attacks of potato blight caused by P. infestans in western Algeria can be severe on foliage levels when infection is early and climatic conditions are favorable. Consequently, the impacts, severities and frequencies recorded in this region were remarkably high during the 2013-2016 crop years. The characterization of 56 potato isolates collected from different localities in western Algeria revealed a high variability in the P. infestans population. This variability resides essentially in the coexistence of the two sexual types A1 and A2 in the same plot or in different plots and by the emergence of metalaxyl-resistant isolates. For example, isolates collected from potatoes, those from the wilaya of Mascara and Ghelizane, those resistant to metalaxyl, and those of the A2 type have more biological and epidemiological characteristics than those of other isolates in terms of mycelial growth In vitro, the aggressiveness of the strains showed that the infection can be carried out 66h to 16°. The assessment of the level of sensitivity of 4 varieties of potatoes showed that the majority of these varieties possess sensitive foliages and tubers with moderate susceptibility to new local strains of P infestans.
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