The effectiveness of Dithane and Bravo in controlling potato early blight in Bonin and Stare Olesno in 1997–2006
Jerzy Osowski
j.osowski@ihar.edu.plInstytut Hodowli i Aklimatyzacji Roślin, Zakład Nasiennictwa i Ochrony Ziemniaka, Bonin (Poland)
Abstract
Field experiments aimed to assess the effectiveness of fungicides Dithane M-45 80 WP (mancozeb) and Bravo 500 SC (chlorothalonil) in controlling potato early blight were carried out in Bonin and Stare Olesno in the years 1997–2006. The higher incidence of the disease was recorded in Stare Olesno (south-west region of Poland). No differences in biological effectiveness of the fungicides were found. The application of Dithane and Bravo in Bonin, as compared to that in Stare Olesno, resulted in lengthening of the period of potato yield accumulation (delayed destruction of 50% of foliage) by 3 days and 5 days, respectively. The increase in the average tuber yield by 20.5% and 20.3%, respectively, was recorded.
Keywords:
chlorothalonil, chemical control, early blight, mancozebReferences
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Authors
Jerzy Osowskij.osowski@ihar.edu.pl
Instytut Hodowli i Aklimatyzacji Roślin, Zakład Nasiennictwa i Ochrony Ziemniaka, Bonin Poland
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