نتایج جستجو برای: trichogramma embryophagum
تعداد نتایج: 765 فیلتر نتایج به سال:
امروزه با گسترش مشکلات ناشی از اجرای روش های مبارزه شیمیایی روش های مدیریت آفات به ویژه مبارزه بیولوژیک از جایگاه خاص و ویژه ای برخوردار شده اند. بر همین اساس در این تحقیق تلاش گردیده است نقش موثر یکی از عوامل کنترل بیولوژیک (زنبور ترایکوگراما Trichogramma علیه کرم ساقه خوار برنج، Chilo suppressalis) در مقایسه با ضایعات ناشی از مصرف بی رویه سموم در استان های شمالی کشور مورد بررسی و تجزیه و تحلی...
Parasitoids learn olfactory and visual cues that are associated with their hosts, and use these cues to forage more efficiently. Classical conditioning theory predicts that encounters with high-quality hosts will lead to better learning of host-associated cues than encounters with low-quality hosts. We tested this prediction in a two-phase laboratory experiment with the parasitoid Trichogramma ...
Pyrrolizidine alkaloid (PA), sequestered by the moth Utetheisa ornatrix from its larval food plant, is transmitted by both males and females to the eggs. Males confer PA on the female by seminal infusion, and females pass this gift, together with PA that they themselves procured as larvae, to the eggs. Here we show that PA protects the eggs against parasitization by the chalcidoid wasp, Trichog...
Experiments were conducted to determine whether Trichogramma platneri Nagarkatti manifested a somatic-gametic trade-off and whether it was affected by host availability and host size. Large wasps produced on Trichoplusia ni Hübner and limited to five or 15 T. ni eggs daily, produced a similar number of progeny as wasps offered hosts from emergence. Similar results were obtained when they were d...
Abstract Effects of egg retention on movement and dispersal activity of Trichogramma principium (Hymenoptera, Trichogrammatidae) females were investigated under laboratory conditions. Individual females were observed during one minute in the absence of hosts. Movement activity and dispersal rate were estimated by the length of the track and by the distance from the start point, respectively. Be...
Natural enemies respond to herbivore-induced plant volatiles (HIPVs), but an often overlooked aspect is that there may be genotypic variation in these 'indirect' plant defence traits within plant species. We found that egg deposition by stemborer moths (Chilo partellus) on maize landrace varieties caused emission of HIPVs that attract parasitic wasps. Notably, however, the oviposition-induced r...
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