نتایج جستجو برای: predator ratios affect mutual interference of c montrouzieri
تعداد نتایج: 21293166 فیلتر نتایج به سال:
In conservation biological control, we seek to make agricultural systems more hospitable to natural enemies, in an attempt to increase enemy abundance and diversity. However, it is unclear whether the effectiveness of biological control actually increases with growing natural enemy diversity, in communities including many species of generalist predators. Studies have shown that suppression of h...
we show that when both sources ( lepton flavor violation sources and cp-violating phases) are present, the electric dipole moment of the electron, $d_e$, receives a contribution from the phase of the trilinear $a$-term of staus, $phi_{a_ au}$. for $phi_{a_ au}=pi/2$, the value of $d_e$, depending on the ratios of the lfv mass elements, can range between zero and three orders of magnitude a...
this dissertation has six chapter and tree appendices. chapter 1 introduces the thesis proposal including description of problem, key questions, hypothesis, backgrounds and review of literature, research objectives, methodology and theoretical concepts (key terms) taken the literature and facilitate an understanding of national security, national interest and turkish- israeli relations concepts...
Earlier studies have shown that larvae of the green lacewing predator Chrysoperla carnea are negatively affected when preying on lepidopteran larvae that had been fed with transgenic maize expressing the cry1Ab gene from Bacillus thuringiensis. To test whether the observed effects were directly caused by the Cry1Ab toxin, we have developed a bioassay which allows us to feed high concentrations ...
BACKGROUND When the concentrations of 2 or more substances are measured separately, their molar ratios are subject to the additive imprecisions of the different assays. We hypothesized that the cumulative error for concentration ratios of peptides containing a common sequence might be minimized by measuring the peptides simultaneously with a "trefoil-type" immunoassay. METHODS As a model of t...
1. Theory suggests that the relationship between predator diversity and prey suppression should depend on variation in predator traits such as body size, which strongly influences the type and strength of species interactions. Prey species often face a range of different sized predators, and the composition of body sizes of predators can vary between communities and within communities across se...
کفشدوزک Muls. Cryptolaemus montrouzieri و کفشدوزک نقاب‌دار دولکه‌ای،Chilocorus bipustulatus (L.) از جمله شکارگرهای مهم شپشک‌های خانوادۀ Diaspididae و Eriococcidae در ایران می‌باشند. از جمله روش‌های شیمیایی مبارزه با شپشک‌ها استفاده از روغن‌های معدنی بوده که سازگاری بالاتری با محیط داشته و با سرعت نسـبتاً زیادی در محیط از بین رفته و خطر بـروز مقاومـت یـا طغیـان آفـات ثانویه در رابطه با این ترکیب...
abstract nowadays, the science of decision making has been paid to more attention due to the complexity of the problems of suppliers selection. as known, one of the efficient tools in economic and human resources development is the extension of communication networks in developing countries. so, the proper selection of suppliers of tc equipments is of concern very much. in this study, a ...
Aim . To study the possibility of using cryptolemus in an integrated system for combating Australian grooved worm conditions southern coast Crimea. Material and Methods The population Icerya purchasi Mackall on plants was determined during regular surveys agrobiocenoses by counting number pest individuals per unit area. biological effectiveness from unique scientific installation «State collect...
abstract governing was disorganized for years, when mongols attached to iran and it caused to clearing way for interference of mongols princes. dispatching of holaku to the west culminated in establishing iilkhanan government. holakus activities in destruction of abbaasis government and activities which shows his staying in iran, made force oulus juji to comparison against iilkhanis gover...
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