Optimal agro-practices to control PVY in potatoes
Sławomir Wróbel
s.wrobel@ihar.edu.plZakład Nasiennictwa i Ochrony Ziemniaka w Boninie, IHAR Radzików (Poland)
Abstract
The effects of pre-sprouting of seed potatoes, weekly treatment with mineral oil and haulm destruction upon the incidence of Potato virus Y (PVY) infection in potato crops were evaluated. Different haulm destruction methods: mechanical, chemical, and combined, were applied. Two mid early cultivars showing different levels of resistance to PVY: Balbina (6.5) and Mila (5.5), were assessed in the years 2000–2002 in Bonin (zachodniopomorskie province). Tuber infection with PVY was examined in winter time, using double antibody sandwich (DAS) ELISA. No effects of pre-sprouting of seed potatoes on potato plants infectibility with PVY were observed. In contrast, treatments with mineral oil reduced the incidence of tuber infection by approximately 50%. The combined method of haulm destruction reduced tuber infection with PVY more effectively (50% and 70% in cvs Mila and Balbina, respectively) than did a chemical or mechanical method (40–65%). Treatment of potato plants with mineral oil followed by haulm destruction using the combined method decreased additionally PVY infection. Depending on the year of study, the infection rate was diminished by 68–79% in cv. Mila, and by 80–84% in cv. Balbina. Based on the results presented in this paper, as well as on those obtained in earlier investigations, an optimal system was determined to be used in seed potato production for cultivars susceptible to PVY. It includes: obligatory weekly treatments of plants with mineral oil; early haulm destruction using a combined (mechanical + chemical) method. The relatively high effectiveness of mechanical haulm destruction in reducing PVY infection indicates the usefulness of this method in seed potato production in ecological systems.
Keywords:
PVY, mineral oil, potato, pre-sproutingReferences
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Authors
Sławomir Wróbels.wrobel@ihar.edu.pl
Zakład Nasiennictwa i Ochrony Ziemniaka w Boninie, IHAR Radzików Poland
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