Volume 11, Issue 5 (2009)                   JAST 2009, 11(5): 505-520 | Back to browse issues page

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Rakhshani H, Ebadi R, Mohammadi A A. Population Dynamics of Alfalfa Aphids and Their Natural Enemies, Isfahan, Iran. JAST 2009; 11 (5) :505-520
URL: http://jast.modares.ac.ir/article-23-371-en.html
1- Department of Plant Protection, College of Agriculture, Isfahan University of Technology, P. O. Box: 84156, Isfahan, Islamic Republic of Iran
2- Department of Plant Protection, College of Agriculture, Isfahan University of Technology, P. O. Box: 84156, Isfahan, Islamic Republic of Iran.
3- of Plant Breeding, College of Agriculture, Isfahan University of Technology, P. O. Box: 84156, Isfahan, Islamic Republic of Iran.
Abstract:   (9024 Views)
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 occurrence of alfalfa aphids and their natural enemies in different regions were varied, but aphid natural enemy populations were more or less coincident with aphid populations. Populations of aphids were mainly affected by alfalfa harvesting, ambient temperature, and coccinellid predators. Hemipterous predators in contrast with coccinellids, had little effect on aphid populations. Parasitoids seem to be effective on low populations of alfalfa aphids. Air humidity and rainfall had no effect on populations of alfalfa aphids.
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Received: 2010/01/23 | Accepted: 2010/01/23 | Published: 2010/01/23

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