Abstract
Both aphid-resistant and aphid-susceptible alfalfa varieties, Medicago sativa L., were more attractive to the tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), in cages containing spotted alfalfa aphids, Therioaphis maculata (Buckton), than in cages lacking aphids. However, plant bug increase on the aphid-resistant variety 'Kanza' was only 17.6%, compared with 123.2% for the aphid-susceptible variety 'Alfa.' In the absence of aphids, attractiveness of the 2 varieties was similar. Rate of tarnished plant bug mortality was markedly lower in cages containing aphids than it was in control cages. Tarnished plant bugs were observed feeding on pea aphids ( Acyrthosiphon pisum (Harris), and spotted alfalfa aphids. When caged on an aphid-susceptible alfalfaclone, adult plant bugs apparently destroyed an average of 2.4 spotted alfalfa aphid and 2.1 pea aphid nymphs per day. Alfalfa sprayed with a 10% sucrose solution attracted significantly more (72%) bugs than did unsprayed alfalfa. Bug increases from spraying were 33 and .143% for 'KSl0' and Alfa, respectively.
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