نتایج جستجو برای: aphis gossipi
تعداد نتایج: 2036 فیلتر نتایج به سال:
یکی از ویژگی های مهم برای انتخاب دشمن طبیعی مناسب جهت استفاده در برنامههای کنترل بیولژیکی آفات، بررسی واکنش تابعی آن در تراکم های مختلف میزبان می باشد. از سوی دیگر کاربرد حشره کش ها روی جمعیت آفات ممکن است، روی واکنش های رفتاری از جمله واکنش تابعی و به دنبال آن روی کارایی دشمنان طبیعی تاثیر بگذارد. در این پژوهش، اثر دو حشره کش ایمیداکلوپرید و پیریمیکارب روی واکنش تابعی زنبور پارازیتوئ...
the toxicity of imidacloprid and pirimicarb for all stages of the melon aphid, aphis gossypii glover, were investigated under laboratory conditions (25 ± 1 oc, 65 ± 5% r.h. and a photoperiod of 16:8 (l: d) h.) using a leaf dipping method. these pesticides were very toxic for first instar nymphs of a. gossypii with lc50 values of 17 and 220.2 ppm for imidacloprid and pirimicarb, respectively. fo...
Five aphid species collected on Wrangel Island (Russia) are presented. One species, Aphis polaris sp. nov., feeding on Astragalus alpinus L. and Oxytropis sp., is described, and the fundatrix morph of two others, Pterocomma groenlandicum Hille Ris Lambers, 1952 and Metopolophium sabihae Prior, 1976., is described for the first time.
The soybean aphid, Aphis glycines, is a pest of soybean in Asia, and it has become a major pest of this crop in North America with large outbreaks that cause significant yield loss. Host-plant resistance is one management tactic being developed against soybean aphid in North America, and resistance may be manifested as antixenosis, antibiosis, or tolerance. In this study, choice tests were cond...
The focus of this study was on quantifying fitness attributes, such as spore density and viability, and determining the virulence level against aphid (Aphis gossypii) nymphs of isolates from the fungal species Beauveria bassiana and Metarhizium anisopliae. The fungal isolates were obtained from several insects, including Plutella xylostella, Hypothenemus hampei, Bronstispa longissima, A. gossyp...
The soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is an economically important pest of soybean, Glycine max (L.) Merrill, in the United States. Phenological information of A. glycines is limited; specifically, little is known about factors guiding migrating aphids and potential impacts of long distance flights on local population dynamics. Increasing our understanding of A. gl...
In the north central United States, populations of the exotic soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), are highly variable across space, complicating effective aphid management. In this study we examined relationships of plant nutrients, landscape structure, and natural enemies with soybean aphid abundance across Iowa, Michigan, Minnesota, and Wisconsin, representing the ...
In the north central United States, populations of the exotic soybean aphid, Aphis glycinesMatsumura (Hemiptera: Aphididae), are highly variable across space, complicating effective aphid management. In this study we examined relationships of plant nutrients, landscape structure, andnatural enemieswith soybeanaphid abundance across Iowa,Michigan,Minnesota, andWisconsin, representing the range o...
Lupin plants are frequently damaged by various herbivorous invertebrates. Significant among these are slugs and aphids, which sometimes attack the same plants. Relationships between aphids, slugs and food plant are very interesting. Grazing by these pests on young plants can lead to significant yield losses. There is evidence that the alkaloids present in some lupin plants may reduce grazing by...
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