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1 June 2002 Influence of Alfalfa Cultivar on Suitability of Acyrthosiphon kondoi (Homoptera: Aphididae) for Survival and Development of Hippodamia convergens and Coccinella septempunctata (Coleoptera: Coccinellidae)
Kristopher L. Giles, Richard C. Berberet, Ali A. Zarrabi, Jack W. Dillwith
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Abstract

Hippodamia convergens Guérin-Méneville and Coccinella septempunctata L. (Coleoptera: Coccinellidae) larvae were supplied daily with 1, 2, 4, or 16 mg of Acyrthosiphon kondoi Shinji (Homoptera: Aphididae) reared on one of two susceptible (‘OK08’ or ‘CUF-101’) or one resistant (‘54H55’) alfalfa cultivar (Medicago sativa L.). Hippodamia convergens survived to the adult stage when supplied with ≥1 mg of A. kondoi per day from both susceptible and aphid-resistant cultivars, whereas C. septempunctata required ≥2 mg of A. kondoi per day (from each cultivar) for survival to the adult stage. For both H. convergens and C. septempunctata, no consistent differences in survivorship or developmental times were observed between predator larvae supplied with increasing daily levels of A. kondoi from susceptible (OKO8 or CUF-101) versus resistant (54H55) cultivars. Additionally, alfalfa cultivar had no indirect influence on adult weight of H. convergens or C. septempunctata. Results from our study suggest that the resistant alfalfa cultivar (54H55) would have little to no effect on the nutritional value of A. kondoi for ladybeetle predators.

Kristopher L. Giles, Richard C. Berberet, Ali A. Zarrabi, and Jack W. Dillwith "Influence of Alfalfa Cultivar on Suitability of Acyrthosiphon kondoi (Homoptera: Aphididae) for Survival and Development of Hippodamia convergens and Coccinella septempunctata (Coleoptera: Coccinellidae)," Journal of Economic Entomology 95(3), 552-557, (1 June 2002). https://doi.org/10.1603/0022-0493-95.3.552
Received: 9 July 2001; Accepted: 1 January 2002; Published: 1 June 2002
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