Онтогенез хмелевой цистообразующей нематоды Heterodera humuli Filipjev

Abstract

One generation a year is observed in Heterodera humuli F i l i p j e v, 1934. Hatch­ ing of invasion larvae from cysts begins in the 3d ten-day period of April or in the 1st ten-day period of May, mass hatching of the larvae occurs late in May and early in June. In this period there appear the first adult individuals, in the 3d ten-day period of June and the 1st ten-day period of July numerous white females are well noticeable on the root surface. Two months pass from the moment of the invasion larvae penetration into roots and up to the appearance of puberal individuals on the root surface and three months are required for the appearance of the first invasion larvae of a new generation. Morphometric data are given.