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The Fenestralia of Heterodera Rostochiensis and H. Pallida

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For more content, see Nematology.

Potato cyst-eelworms from twelve isolates were reared on susceptible tomato 'Ailsa Craig' and on resistant (to H. rostochiellsis) Lycopersicon peruvianum. The fenestralia of almost 1800 cysts formed on these plants were critically examined under the light microscope. The number of perineal ridges on the cysts is related to the distance "B" of Granek (1955), and it cannot be used to separate the "H. rostochiensis group" (Green 1971) from other round-cyst Heteroderas. H. pallida has fewer ridges (usually less than 14) than H. rostochiensis (usually more than 14). The vulva and fenestralia of potato cyst-eelworms are described and compared. Because potato cyst-eelworms are introduced pests with great opportunities for inbreeding, their morphological and other characters should be used with caution for species/pathotype diagnosis.

Affiliations: 1: Glasshouse Crops Research Institute, Littlehampton, Sussex, England


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