Distribution of Eggs and Parasites of Lygus spp. (Hemiptera: Miridae), Nabis spp. (Hemiptera: Nabidae), and Spissistilus festinus (Say) (Homoptera: Membracidae) on Plant Stems

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Abstract
Near Tucson, Ariz., eggs of Lygus spp. (primarily L. hesperus Knight) and Nabis spp. were mostly deposited in the apical 30 cm of alfalfa stems, whereas those of the three-cornered alfalfa hopper, Spissistilus festinus (Say), were more evenly distributed. Oviposition by Lygus and Nabis in London rocket, Sisymbrium irio L., was similar to that on alfalfa when the plants were young and succulent, whereas on mature plants more eggs were found on the lower parts of the stems. The mymarid egg parasite, Anaphes ovijentatus (Crosby and Leonard), preferred Lygus. Of the Lygus eggs found in London rocket and alfalfa, 34 and 9%, respectively, were parasitized by A. ovijentatus. Parasitized Lygus eggs were most abundant 15 to 30 cm below the apex of alfalfa stems.

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