Effect of phytophagous organisms on the seed yield and germination power of cow parsnip (Heracleum sosnowskyi Manden)
1990
Jurek, M. (Instytut Hodowli i Aklimatyzacji Roslin, Krakow (Poland). Zaklad Roslin Pastewnych)
The occurrence frequency of turnished plant bugs, parsnip webworm and the intensity of powdery mildew were higher in the years of lower rainfall sums and higher temperatures in May-July. The damages caused by aphids and turnished plant bugs can be considerably limited by applying an insecticide after forming fruits
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