population dynamics of three main alfalfa aphids, namely: pea aphid, acyrthosiphon pisum (harris), spotted alfalfa aphid, therioaphis trifolii forma maculata (buckton), black alfalfa aphid, aphis craccivora koch, and their most abundant predators and parasitoids in three sites and in two subsequent years in isfahan, iran, were investigated. the results revealed that frequency and temporal occur...

Field assessments were conducted to examine the interplay between host plant and predation in complex agricultural mosaic on pea aphid clover and alfalfa races. In one experiment, we examined the relative fitness on clover race (CR) and alfalfa race (AR) pea aphids on broad bean, red clover and alfalfa alone. But because clover is typically grown in a more complex agricultural mosaic with alfal...

in the current study some information is presented about the distribution and associations between alfalfa aphids and their parasitoids in different regions in 11 provinces of iran, as well as an identification key to the parasitoids. the main aphids were therioaphis trifolii maculata (buckton) and acyrthosiphon pisum (harris) followed by aphis craccivora koch and acyrthosiphon kondoi shinji. t...

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The Egyptian alfalfa weevil (alfalfa weevil in some areas) during most years is the most severe insect pest of alfalfa in California. These pests feed on alfalfa leaflets and stems, reducing hay yields. Several insecticides provide acceptable control of this pest. Historically, product choice has been driven by efficacy on the pest, cost, presence of other pests, i.e., aphids, days before harve...

Integrated pest management in alfalfa continues to be challenged by changes in the pests, alfalfa production system, environmental conditions, and other undetermined factors. Many of the underlying principles of integrated pest management (IPM) were developed from research conducted in the alfalfa system in the 1960-80’s. However, as indicated by challenges in controlling alfalfa weevil larvae ...

during a two-year (2004-2005) survey of alfalfa aphids and their natural enemies in isfahan, a total of four aphid species and 58 species of their natural enemies comprised of 45 predatory species, 11 parasitoid species and two species of parasitic mites were collected and identified. moreover, five hyperparasitoid species were collected. on each sampling date, six 20-sweep samples were taken u...

We used multiple regression modeling to investigate the numerical response by the predatory insectsHippodamia convergensGuérin-Méneville,H. parenthesis (Say), and C. septempunctataL. (Coleoptera: Coccinellidae),Chrysoperla plorabunda (Fitch) (Neuroptera: Chrysopidae), and Nabis americoferus Carayon (Hemiptera: Nabidae) to aphids during 5 yr in three geographically separated alfalfa Þelds in eas...

Spring Autumn Summer FOLIAGE DAY FOLIAGE NIGHT GROUND NIGHT GROUND -DAY ALFALFA a r t i c l e i n f o