نتایج جستجو برای: شته sitobion avenae
تعداد نتایج: 1518 فیلتر نتایج به سال:
به منظور بررسی تراکم و پراکنش فضایی جمعیت دو شتهیsitobion avenae (f.) و schizaphis graminum (rondani) روی خوشههای گندم (triticum aestivum l.) و نیز طراحی یک برنامهی نمونهبرداری دنبالهای با دقت ثابت برای آنها، طی دو فصل زراعی 1385 و 1386 از پنج مزرعهی گندم پاییزه در اطراف گرگان، نمونهبرداری هفتگی به عمل آمد. با استفاده از شاخصها و مدلهای مختلف، پراکنش فضایی مراحل مختلف نشوونمایی شته...
Heterodera avenae is an important soil-borne pathogen that affects field crops worldwide. Chemical nematicides can be used to control the nematode, but they bring toxicity to the environment and human. Trichoderma longibrachiatum has been shown to have the ability to control H. avenae cysts, but detailed microscopic observations and bioassays are lacking. In this study, we used microscopic obse...
Exposure to carbofuran and fenamiphos for 72 hours reduced the numbers of active Aphelenchus avenae in aqueous suspension by > 75%. When nematicides were removed, many A. avenae exposed to carbofuran resumed normal movement but A. avenae treated with fenamiphos did not recover. Acetylcholinesterase (AChE) activity was suppressed by > 95% in nematodes treated with carbofuran or fenamiphos. Howev...
to identify the impacts of chemical control of weeds on wheat aphids community, a field experiment was conducted in a completely randomized design with two factors, each in three replicates in a 20-ha wheat field. the herbicide treatment used tribenuron methyl, a broadleaf–selective herbicide and the control treatment not treated with herbicide. all other agricultural practices were the same fo...
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