Effects of single and combined infection of arrowleaf clover trifolium vesiculosum with bean yellow mosaic virus and a phytophthora sp on reproduction and colonization by pea aphids homoptera aphididae
Ellsbury, M.M.; Pratt, R.G.; Knight, W.E.
Environmental Entomology 14(3): 356-359
ISSN/ISBN: 0046-225X Accession: 005325287
Reproduction and colonizing behavior of pea aphids, Acyrthosiphon pisum (Harris), were studied on reproductive arrowleaf clover, T. vesiculosum Savi, using 4 treatments: healthy, infected with bean yellow mosaic virus (BYMV), infected with a Phytophthora sp. that caused root rot, or infected with both BYMV and the Phytophthora sp. Reproduction of aphids in no-choice experiments was significantly lower on plants in the 2 treatments with the root rot disease than on healthy or BYMV-infected plants. The highest level of reproduction was observed on healthy plants. Aphid colonization also was lower on fungus-infected plants whether BYMV was present or not. Results of these studies suggest that a complex relationship exists between aphid vectors, virus disease and fungal root disease in arrowleaf clover. Presence of fungal root rot disease may influence reproduction and movement of alate aphids and epidemiology of aphid-transmitted viruses during both fall and spring periods of alate aphid activity, when plants are in vegetative or reproductive stages, respectively.