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Effects of Temperature On Emergence of Juveniles and Root Invasion in Two Populations of Heterodera Lespedezae

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For more content, see Nematology.

Emergence of Heterodera lespedezae juveniles from cysts and their invasion of striate lespedeza (Les pedeza striata) roots at selected temperatures, from 15 to 35°C, were studied for populations from Illinois and North Carolina. Maximum emergence of juveniles from both populations occurred at 25°C. Striate lespedeza root leachate enhanced emergence from only yellow cysts of the North Carolina population incubated at 20 and 25°C. Cysts from the Illinois population did not respond to leachate; however, more juveniles emerged from yellow than from brown cysts incubated at 20 and 25°C. Juveniles from both populations invaded striate lespedeza roots at all temperatures but significantly more North Carolina juveniles penetrated roots at 30 and 35°C than did Illinois juveniles.

Affiliations: 1: ) Dept. of Plant Pathology, Oklahoma State University, Stillwater, OK 74078; 2: ) USDA, ARS, University of Illinois, Urbana, IL 61801; 3: ) Dept. of Plant Pathology, University of Illinois, Urbana, IL 61801


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