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Англо-русский сельскохозяйственный словарь. 2013.
Англо-русский сельскохозяйственный словарь. 2013.
Knopper gall — Knopper galls develop as a chemically induced distortion of growing acorns on Pedunculate Oak ( Quercus robur ) trees, caused by gall wasps which lay eggs within buds using their ovipositor. The gall thus produced can greatly reduce the fecundity … Wikipedia