THE NATURE OF BULB NEMATODE (DITYLENCHUS DIPSACI) POPULATIONS IN "SUPREME", "PRINCE ALBERT", AND "IMPERATOR" IRIS BULBS, AND THEIR CONTROL BY THERMAL TREATMENT

1 June 1938

journal article
Published by Canadian Science Publishing in Canadian Journal of Research

Vol. 16c (6) , 230-233
https://doi.org/10.1139/cjr38c-022

Abstract

"Supreme" and "Prince Albert", representing a Dutch tingitana hybrid and an English iris, are much more susceptible to nematode infestation than "Imperator", a Dutch iris, as judged by the number of nematodes per unit volume of invaded tissue, viz.: 596, 108, and 13 respectively. Infestation in "Prince Albert" tends to be confined to the basal plate. Rapid multiplication of the nematodes within the bulb tissue occurs in "Supreme" and "Prince Albert." On the other hand, little multiplication occurs within "Imperator" bulb tissue.The populations within iris bulb tissue consist largely of young larvae in contrast with a high pre-adult population in narcissi. The low population of the heat-resistant pre-adults accounts for the fact that the nematode population in "Supreme" bulbs can be destroyed by a 60-minute immersion at 110° F., whereas a three-hour immersion is required to destroy the nematodes in narcissi.

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