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SYMPTOMS OF SUSCEPTIBILITY AND RESISTANCE IN SEEDLINGS OF RED CLOVER ATTACKED BY THE STEM EELWORM DITYLENCHUS DIPSACI (KÜHN) FILIPJEV1) BY J. DIJKSTRA (Foundation for Agricultural Plant Breeding S.V.P., Wageningen) In certain regions of the Netherlands heavy damage to red clover (Trifolium pratense L.) is caused by the stem eelworm (Dit)Ilenchui' dipsaci (Kiihn) Filipjev). The disease spreads rapidly during the year after sowing, resulting in a low yield of the second cut. In breeding for resistance, FRANDSEN (I95I) and BINGEFORS (1952 and 1957) distinguished two groups of plants, those with swellings, which were called susceptible and those without which were presumed to be resistant. A detailed description of symptoms in resistant plants was not given, so that it may be assumed that they appeared normal. SEINHORST (1956) inoculated seedlings of red clover with stem eelworms derived from rye (Secale cereale L), onions (Alliuin cepa L.), mangolds (Beta vulgaris I..), potatoes (Solanum tuberosuiii L.) and red clover. GOODEY (1941 and 1950) inoculated with stem eel- worms from oats (Avena sativa L.). Eelworms from hosts other than red clover caused brown spots on the hypocotyl, the cotyledons and their petioles. The plants did not exhibit swellings such as occur in red
Nematologica – Brill
Published: Jan 1, 1957
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