ISSN:
1570-7458
Keywords:
Diuraphis noxia
;
Diaeretiella rapae
;
Agropyron trachycaulum
;
host plant resistance
;
tritrophic interactions
;
biological control
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Interactions among three trophic levels of resistant and susceptible slenderwheat grasses, Elymus trachycaulum (Link) Goule ex Shinners ex. H.F. Lewis, Russian wheat aphid, Diuraphis noxia (Mordvilko), and a hymenopterous parasitoid were studied in the laboratory and greenhouse. These relationships were compared with a commercial susceptible wheat Triticum aestivum L. variety. Aphids reared on the resistant entries showed significantly lower weights and numbers. Significant reduction of parasitoid mummy weight and adult size was positively correlated with the effects on the aphids. Resistant entries also induced a longer prereproductive period for both the aphids and parasitoids. Numbers of aphids and aphid damage were significantly modified by the addition of parasitoids. Parasitism was higher on plants that did not have leaf rolling. These findings may indicate that antibiosis resistance studied here is not the most desirable because it decreases natural enemy vitality.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00341087
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