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Comparisons of Invasion and Development of Globodera Spp. and European Potato Cyst-Nematode Pathotypes in Roots of Resistant Solanum Sg. Leptostemonum Spp

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Populations of Globodera species from the Americas and potato cyst-nematodes G. pallida pathotype Pa2 and G. rostochiensis pathotype Rol from Europe were compared by their relative abilities to invade and develop in roots of eight wild Latin American Solanum sg. Leptostemonum spp. resistant to Globodera and in susceptible S. prinophyllum from Australia. All resistant plants were invaded by second stage juveniles. G. tabacum, a G. rostochiensis population from Bolivia, G. solanacearum and G. virginiae in that order had the greatest invasion rates and development into the third and fourth stages. G. rostochiensis Ro1 and G. pallida Pa2 invaded less numerously and few developed to the third stage. In all combinations fourth stage juveniles were mostly males. Only in Ro1 and Pa2 did males fail to reach adulthood in any plant species. S. quitoense and S. sisymbriifolium, which differentiate Globodera populations and appear to have specific resistance, were most heavily invaded, allowed greatest development of juveniles and produced most adult males. In strongly resistant S. torvum and S. viarum, which appear to have nonspecific resistance, and in S. hirtum juveniles invaded less numerously and rarely developed beyond the early third stage.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts AL5 2JQ, U.K.


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