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Emergence of Larvae From New Cysts of the Potato-Root Eelworm, Heterodera Rostochiensis

Emergence of Larvae From New Cysts of the Potato-Root Eelworm, Heterodera Rostochiensis EMERGENCE OF LARVAE FROM NEW CYSTS OF THE POTATO-ROOT EELWORM, HETERODERA ROSTOCHIENSIS BY C. ELLENBY and L. SMITH Department of Zoology, University of Newcastle upon Tyne, England New brown and still yellow cysts of the potato-root eelworm were picked off the host plant at the same time. Both yellow-harvested and brown-harvested cysts were at once stimulated with a solution of a hatching concentrate. A high rate of emergence occurred from the yellow-harvested cysts but the rate was low from the cysts harvested when already brown. Since the yellow cysts turned brown after harvesting, the only apparent difference between the categories was their age. It is concluded therefore that the lack of response from the brown-harvested cysts indicates that a true dormancy develops during cyst maturation. This view is consistent with previous work with new brown cysts. Although the stimulatory effect of root diffusates on hatching was first des- cribed, for the beet eelworm, in 1922 (Baunacke) and for the potato root eelworm a few years later (Triffitt, 1930), their mode of action is still obscure. Evidence from this laboratory (Ellenby & Gilbert, 1957, 1960) suggested that the hatching factor of the potato root eelworm had affinities with cardiac http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

Emergence of Larvae From New Cysts of the Potato-Root Eelworm, Heterodera Rostochiensis

Ellenby, C.; Smith, L.
Nematologica , Volume 13 (2): 6 – Jan 1, 1967
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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2596
eISSN
1875-2926
DOI
10.1163/187529267X00139
Publisher site
See Article on Publisher Site

Abstract

EMERGENCE OF LARVAE FROM NEW CYSTS OF THE POTATO-ROOT EELWORM, HETERODERA ROSTOCHIENSIS BY C. ELLENBY and L. SMITH Department of Zoology, University of Newcastle upon Tyne, England New brown and still yellow cysts of the potato-root eelworm were picked off the host plant at the same time. Both yellow-harvested and brown-harvested cysts were at once stimulated with a solution of a hatching concentrate. A high rate of emergence occurred from the yellow-harvested cysts but the rate was low from the cysts harvested when already brown. Since the yellow cysts turned brown after harvesting, the only apparent difference between the categories was their age. It is concluded therefore that the lack of response from the brown-harvested cysts indicates that a true dormancy develops during cyst maturation. This view is consistent with previous work with new brown cysts. Although the stimulatory effect of root diffusates on hatching was first des- cribed, for the beet eelworm, in 1922 (Baunacke) and for the potato root eelworm a few years later (Triffitt, 1930), their mode of action is still obscure. Evidence from this laboratory (Ellenby & Gilbert, 1957, 1960) suggested that the hatching factor of the potato root eelworm had affinities with cardiac

Journal

Nematologica – Brill

Published: Jan 1, 1967

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