AuthorKnowles, Tim C.
blue alfalfa aphid
spotted alfalfa aphid
MetadataShow full item record
AbstractThe alfalfa aphid discussed in this publication includes blue alfalfa aphid, pea aphid, and the spotted alfalfa aphid. This publication discusses the biology of these alfalfa aphids, the damages they cause, the resistant varieties and biological control, and their monitoring and treatments.
Series/Report no.University of Arizona Cooperative Extension Publication AZ1044
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Insecticidal effects on cowpea aphids and their parasitoids, blue alfalfa aphids, and alfalfa weevils in 2002Rethwisch, Michael D.; Hayden, Paula; Hayden, Ben; Griffin, Bradford J.; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2002-10)Twentynine insecticide treatments were applied on Feb. 7, 2002, to evaluate the effects of chemistry and rates on cowpea aphids and associated parasitic wasps. Data were also able to be collected on blue alfalfa aphids and alfalfa weevil larvae. At seven days post treatment fewest cowpea aphids were noted in plots treated with Furadan, the 3.84 oz./acre rate of WarriorT, and several of the higher rates of Lorsban 4E. Organophosphate insecticides had fewer cowpea aphids on the whole than did pyrethroid insecticides. All insecticide treatments had significantly fewer parasitic wasps than the untreated check, although these populations may correspond to aphid populations. All insecticide treatments had fewer blue alfalfa aphids early in the study, with very good control noted from the 3.84 oz./acre rate of WarriorT and the combination of 8 oz. of Lorsban 4E + 2 oz./acre of Baythroid 2. Treatments containing Baythroid 2 had the fewest blue alfalfa aphids at 44 days post treatment. Treatments which had at least 70% fewer weevils than the untreated check at 12 days post treatment included Furadan, all treatments that included any formulation of Baythroid, and the high rates of WarriorT and Pounce 3.2 EC, and the 0.088 rate of F1785 50DF.
Effect of Late Winter 1998 Furadan4F Alfalfa Stubble Treatment on Alfalfa Growth and Alfalfa Weevil, Aphid, and Threecornered Alfalfa Hopper PopulationsRethwisch, Michael D.; Kruse, Michael; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 1999-05)Furadan 4F was applied to alfalfa regrowth stubble following the first harvest of 1998 to examine treatment effects of alfalfa weevils, aphids, resultant plant growth, and threecornered alfalfa hoppers. Furadan 4F reduced larval numbers throughout the period that larvae were present (25 days after treatment). Little effect was noted for adult weevil numbers in field. Aphid numbers were also reduced by the treatment, and alfalfa stems in Furadan 4F plots were significantly taller at 21 days post treatment. Little, if any, effect from the Furadan 4F treatment was noted for adult threecornered alfalfa hopper populations during the five months following application.