population dynamics of alfalfa aphids and their natural enemies, isfahan, iran
نویسندگان
چکیده
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.
منابع مشابه
A survey of alfalfa aphids and their natural enemies in Isfahan, Iran, and the effect of alfalfa strip-harvesting on their populations
در طی دو سال (1384-1383) نمونه‌برداری از جمعیت شته‌های یونجه و دشمنان طبیعی آن‌ها در اصفهان، در مجموع 4 گونه شته و 58 گونه از دشمنان طبیعی آن‌ها شامل 45 گونه شکارگر، 11 گونه پارازیتوئید و 2 گونه کنه‌ی پارازیت جمع‌آوری و شناسایی شد. علاوه بر این، 5 گونه هیپرپارازیتوئید نیز جمع‌آوری گردید. در هر روز نمونه‌برداری، شش نمونه هر کدام شامل 20 بار تور‌زدن به وسیله‌ی یک تور حشره‌گیری با قطر 38 سانتی‌مت...
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عنوان ژورنال:
journal of agricultural science and technologyناشر: tarbiat modares university
ISSN 1680-7073
دوره 11
شماره Supplementary Issue 2010
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