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FIELD TESTS FOR MEDICAGO RESISTANCE AGAINST THE POTATO LEAFHOPPER (HOMOPTERA: CICADELLIDAE)12

Published online by Cambridge University Press:  31 May 2012

B. J. Fiori  and
D. D. Dolan
B. J. Fiori
Affiliation:
U.S. Department of Agriculture, Agricultural Research Northeast Regional Plant Introduction Station, New York State Agricultural Experiment Station, Geneva, New York 14456
D. D. Dolan
Affiliation:
U.S. Department of Agriculture, Agricultural Research Northeast Regional Plant Introduction Station, New York State Agricultural Experiment Station, Geneva, New York 14456
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Abstract

A collection of 70 Medicago introductions were field tested for resistance against potato leafhopper, Empoasca fabae (Harris), damage. All M. sativa L. ssp. sativa and most ssp. mixtures were susceptible. All ssp. falcata (L.) Arcangeli, one ssp. mixture sativa and caerulea (Lessing ex Ledebour) Schmalhausen, ssp. × varia (Martyn) Arcangeli and M. pironae Vis were resistant receiving one-half or less damage than the standard cultivars during four seasons of testing. Resistant introductions were slower in regrowth, attained less height, had smaller leaflets, thinner, tougher stems, and more prostrate growth than standard cultivars. Results suggest most observed resistance is due to avoidance of tough stems for oviposition.

Résumé

Un groupe de 70 lignées introduites de Medicago ont été testées sur le terrain pour leur résistance au dommage par la cicadelle de la pomme de terre, Empoasca fabae (Harris). Toutes les M. sativa L. ssp. sativa et la plupart des mélanges étaient susceptibles. Toutes les ssp. falcata (L.) Arcangeli, un mélange ssp. sativa et caerulea (Lessing ex Ledebour) Schmalhausen, la ssp. × varia (Martyn) Arcangeli et M. pironae Vis étaient résistantes, ayant souffert la moitié ou moins du dommage causé aux cultivars standards en 4 ans d’essais. Les lignées résistantes avaient une vitesse de repousse réduite, atteignaient une hauteur moindre, avaient des folioles plus petites, des tiges plus minces et plus dures, et une stature plus affaissée que les cultivars standards. Les résultats semblent indiquer que la résistance observée est causée par l’absence de ponte dans les tiges coriaces.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 12 , December 1981 , pp. 1049 - 1053
Copyright
Copyright © Entomological Society of Canada 1981

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