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Spear Development in Ditylenchus Destructor Thorne 1 )

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Development of a micro-observation chamber has made possible direct observation of spear formation in specimens of Ditylenchus destructor at magnifications up to 1025 X. The spear originates from a primordial region distinguishable by its transparency and the presence of three cutinized rings around the old spear shaft early in molt. The spear apex develops progressively from the upper ring and the basal portion forms first within the lower rings and develops posteriorly. The spear apparently is built up from materials produced within the primordium.

Affiliations: 1: Department of Plant Pathology and Physiology, University of Minnesota, St. Paul, Minnesota; 2: Department of Plant Pathology, University of Wisconsin, Madison, Wisconsin, U.S.A.


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