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Morphology and Biology of Hop Cyst Eelworm (Heterodera Humuli Filipjev 1934)

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Since 1957, all hop gardens in Belgium examined have been found to be infested by Heterodera humuli, with an average of 100 (5-390) cysts per 100 g of dry soil, each cyst containing about 16 (2-55) larvae, which is an average for the field population. Young mature females contain 229 (194-263) larvae and eggs. Many measurements gave good average dimensions of cysts (L: 480 μ X B: 371 μ), larvae (L = 425 μ), giant larvae (L = 560 u), eggs (L = 98 μ) and giant eggs (L = 139 μ). There was no correlation between the measurements of perineal patterns and those of the corresponding cysts. In the field, only two host plants were found: Humulus lupulus and Urtica dioica. Cysts on Urtica dioica were smaller (L = 419 μ X B = 338 μ) than those on Humulus lupulus. In a hatching trial with root diffusates of H. lupulus, Cannabis sativa, U. dioica, U. urens and Ficus sp., using soil extract and water as controls, only diffusate of H. lupulus had more effect on the hatching of larvae than water.

Affiliations: 1: Rijkslandbouwhogeschool, Gent, Belgium

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/content/journals/10.1163/187529263x00106
1963-01-01
2016-12-11

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