Abstract
The effect of populin extract from black poplar (Populus nigra) on seven different late blight strains was tested under laboratory and field conditions. The growth rate of hyphae was found to be significantly lower in vitro after 3 and 4 v/v% populin applications. Stain M16 was resistant to populin treatment under lab conditions, however. Both 5% and 10% concentration populin reduced the M16 strain’s severity on potato leaves under field conditions and proved to be even more effective than conventionally used fungicides Infinito 687 Sc and Valis M. Higher infection intensity at the 1% level was observed after 24 h using Valis M, and the same trend toward 10% infection remained after 48 and 72 h as well. Low, almost-no-infection intensity was detected after populin 5% and 10% treatment under an open field condition. Altogether, it can be concluded that populin extract can be a low-cost option for growers and an environmentally friendly approach in late blight control.
Highlights
Late blight caused by Phytophthora infestans (Mont.) de Bary is one of the most severe and economically important diseases of the Solanaceae family worldwide [1]
Because potatoes represent one of the most economically important vegetables, and because late blight resistance against conventional fungicides has already been demonstrated, we considered that populin may have a similar effect on late blight in potatoes
All data were first averaged and log10 transformed, PCA covariance analyses were run using Community Analysis Package 4 in Considering the average growth rate of P. infestans hyphae under lab conditions in the control, the most intensive growth was detected for strain NY34, reaching the maximum area of 55 mm on the 5th day
Summary
Late blight caused by Phytophthora infestans (Mont.) de Bary is one of the most severe and economically important diseases of the Solanaceae family worldwide [1]. It was responsible for the disastrous Irish potato famine in the 1850s, during which millions of people, especially children, starved and even died. Millions more were forced to emigrate [2]. The entire host plant can be severely infested very quickly [2,3]. In the past few decades, the disease has re-emerged in several parts of the world as a more aggressive pathogen of potato and tomato [4,5].
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