Environmental Entomology (1983) 12, 1601-1605

Gary J. Brewer, Edgar L. Sorensen and Ernst K. Horber (1983)
Laboratory techniques to evaluate resistance of alfalfa clones to the alfalfa seed chalcid (Hymenoptera: Eurytomidae)
Environmental Entomology 12 (5), 1601-1605
Abstract: Varying infestation of alfalfa by the seed chalcid, Bruchophagus roddi Gussakovsky, is explained by antixenosis during oviposition. Our studies suggest that alfalfas with glandular-haired and tightly coiled pods are resistant. Oviposition resulted in seed damage even when larvae did not develop. Seed abortion was 33% in seed chalcid exposed and 16% in unexposed seed pods. The black or brown marks left on developing seeds by ovipositing females may be used in designing laboratory experiments to predict resistance in the field.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Bruchophagus roddi	Alfalfa/lucerne (Medicago sativa)