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Morphometrics of Males and Larvae of Ten Heterodera Rostochiensis Populations and the Influence of Resistant Hosts

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Pathotype B and E larvae of H. rostochiensis differed from those of pathotype A in having longer stylets and greater distances between the median bulb and the excretory pore. Except for larvae from one pathotype E population, they also had longer bodies. A population from Bolivia had golden yellow cysts, and larvae and females resembling those of pathotype A, but produced many females on an ex andigena potato hybrid (i.e. behaviour expected of pathotypes B or E). Males from pathotype A populations had shorter stylets than those from B or E populations, but these differences were complicated by stylet length decreasing with a decrease in body length. Resistant hosts often decrease mean body and hence stylet length. Results indicate that in British populations two or more species are present.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts., England


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