نتایج جستجو برای: rhopalosiphum maidis
تعداد نتایج: 430 فیلتر نتایج به سال:
بیماریهای ویروسی غلات، دارای ناقل طبیعی، در استان چهارمحال و بختیاری اغلب باعث خسارت اقتصادی میشوند. گونههای Rhopalosiphum padi، Sipha elegans، Schizaphis graminum، Sitobion avenae، Rhopalosiphum maidis و Metopolophium dirhodum به ترتیب فراوانی جمعیت بهعنوان مهمترین ناقلین ویروسهای کوتولگی زرد جو و غلات در شهرکرد طی سالهای 87-1385 شناخته شدند. سروتیپ های barley yellow dwarf virus-PAV (PA...
Plants produce a wide variety of defensive metabolites to protect themselves against herbivores and pathogens. Non-protein amino acids, which are present in many plant species, can have a defensive function through their mis-incorporation during protein synthesis and/or inhibition of biosynthetic pathways in primary metabolism. 5-Hydroxynorvaline was identified in a targeted search for previous...
طی نمونهبرداریهایی که در سال زراعی 90-1389 از شتههای Rhopalosiphum maidis F. و Schizaphis graminum R. در مزارع گندم منطقه باجگاه، استان فارس، انجام شد، پراکنش فضایی و مدلهای نمونهگیری دنبالهای با دقت ثابت مورد مطالعه قرار گرفت. برای این منظور دو مزرعه دو هکتاری انتخاب و بهصورت هفتگی نمونهبرداری انجام شد. در هر تاریخ تعداد 200 بوته گندم بهطور تصادفی انتخاب و تعداد شتههای آنها شمارش ش...
ABSTRACT Thirteen aphid species were tested for their ability to transmit Pennsylvania isolates of Plum pox virus (PPV) collected in Columbia (PENN-3), Franklin (PENN-4), and York (PENN-7) Counties, PA. Four species, Aphis fabae, A. spiraecola, Brachycaudus persicae, and Myzus persicae, consistently transmitted PPV in preliminary transmission tests. Two species, Metopolophium dirhodum and Rhopa...
Development and reproductive potential of the Coccinella septempunctata L. (CSL) was conducted under laboratory conditions to determine its fecundity and longevity on natural and artificial diets. Tests were made on laboratory rearing materials and all development stages were carefully recorded. Success ratios in these experiments were a matter of logistic and synchronization of these life cycl...
Cakchiquel farmers in Patzún, Guatemala stated that pest populations have increased in corn crops since they abandoned organic fertilization and adopted synthetic fertilizers. Given the dearth of scientific information about the effects of fertilization practices on pests, a controlled experiment was performed to elucidate these interactions. Pests, their natural enemies, and nutritional status...
Eriopis connexa (Germar) (Coleoptera: Coccinellidae) occurs in several countries of South America and its mass rearing is important for biological control programmes. This work evaluated biological aspects of E. connexa larva fed on eggs of Anagasta kuehniella (Zeller) (Lepidoptera: Pyralidae) and Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) frozen for one day, fresh eggs of Dia...
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