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Further Observations on Cyst Colour Changes in Potato Cyst Eelworm Pathotypes
Author(s) -
Guile C. T.
Publication year - 1970
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1970.tb00968.x
Subject(s) - biology , heterodera , cyst , horticulture , pathology , medicine , ecology , nematode
SUMMARY Observations in 1967 and 1968 on developing cysts of potato cyst eelworm ( Heterodera rostochiensis Woll.) indicated that the colour change sequence in pathotype B differed markedly from that of pathotypes A and E (formerly called C) in passing through a short cream and then a prolonged creamy‐yellow phase before finally turning brown. The creamy‐yellow phase was not easily distinguished from the short pale yellow of pathotype A or the short pale creamy‐yellow of pathotype E, unless individual cultures were closely examined at regular intervals. Screening tests, however, suggested that pathotype B is probably rare or even absent in the East Midlands and parts of Wales and may be ignored when examining the roots of infested commercial potatoes for pathotypes A or E, the developing cysts of which can be readily distinguished by colour differences.