نتایج جستجو برای: net reproductive rate r0 was 19814722

تعداد نتایج: 4454320  

2009
Carlos A. Blanco Maribel Portilla Craig A. Abel Henry Winters Rosie Ford Doug Streett

Soybean flour and wheat germ are the two most important protein components of wheat germ-based insect artificial diets. The effect of modifying the proportion of these two ingredients in a Noctuidae-specific diet was investigated utilizing the tobacco budworm Heliothis virescens (F.) (Lepidoptera: Noctuidae), with the goal of developing a suboptimal diet that, without drastically affecting this...

Journal: :Agronomy 2022

Hormesis for the intractable pests can be dreadful, but natural enemies of pests, it is a puissant strategy in optimizing their mass rearing. We report multigenerational stimulatory effects widely used insecticide, imidacloprid, on demographic traits an important egg parasitoid Trichogramma chilonis Ishii. The study investigated consequences sublethal (LC5), low lethal (LC30), and median (LC50)...

2005
James O. Lloyd-Smith Sebastian J. Schreiber Wayne M. Getz

It is common practice in disease modeling studies to characterize groups or subgroups using population-average parameters, most importantly the basic reproductive number, R0. This approach overlooks variation at the individual level, which is caused by many factors. In this paper we show evidence of significant individual-level variation in transmission patterns for several diseases, and discus...

Journal: :Anticancer research 2012
Christian Eichler Annette Hübbel Verena Zarghooni Anke Thomas Oleg Gluz Mariam Stoff-Khalili Mathias Warm

AIM The objective of this study was the investigation of a possible improvement of tumor resection rate, i.e. R0 vs. R1 resection when intraoperative ultrasound evaluation of tissue margins is used during breast-conserving surgery (BCS). PATIENTS AND METHODS A total of 250 cases were evaluated retrospectively. The impact of ultrasound analysis onto clean margin rates was evaluated. A subgroup...

Journal: :journal of crop protection 2015
mojdeh akandeh farhan kocheili mahmoud soufbaf arash rasekh

reproductive parameters and ovipositional preference of plutella xylostella were assessed on some mutant genotypes of canola (rgs 8-1, rgs 10-2, rgs 8-13, zar 9-9 and talaye 8-3) and their cultivars (rgs, zar, talaye) under greenhouse condition (21 ± 6 °c, 65 ± 10 rh and a photoperiod of 16l: 8d h). comparison of the reproductive parameters on rgs and its mutant genotypes revealed that mutant g...

Journal: :Horticulturae 2023

Interest in developing novel crop protectants has increased the recent decade due to harmful effects of synthetic pesticides on humans and environment. Diaphorina citri threatens citrus industry worldwide is primary vector phloem-limited bacterium (HLB). However, there no available cure for HLB. management mainly depends use insecticides, but their massive application leads resistance pest popu...

Journal: :Agronomy 2022

The brown planthopper (BPH), Nilaparvata lugens Stål (Hemiptera: Delphacidae) is one of the most destructive rice pests in Asia. microbial metabolite decoyinine (DCY) has been extracted from Streptomyces hygroscopicus. Recent studies have suggested that treating seeds with DCY could improve growth and yield rice. To further assess effects priming different varieties on seedling resistance again...

Journal: :Environmental entomology 2010
Hardev S Sandhu Gregg S Nuessly Susan E Webb Ronald H Cherry Robert A Gilbert

The lesser cornstalk borer, Elasmopalpus lignosellus (Zeller) (Lepidoptera: Pyralidae) is an important pest of sugarcane (a complex hybrid of Saccharum spp.) in southern Florida. Reproductive and life table parameters for E. lignosellus were examined at nine constant temperatures from 13 to 36 °C with sugarcane as the larval food source. The pre- and postoviposition periods decreased with incre...

2016
Qihua Huang Yu Jin Mark A. Lewis

One key issue for theory in stream ecology is how much stream flow can be changed while still maintaining an intact stream ecology, instream flow needs (IFNs); the study of determining IFNs is challenging due to the complex and dynamic nature of the interaction between the stream environment and the biological community. We develop a process-oriented benthic-drift model that links changes in th...

2014
Ling Pan Yi-Long Xi Hong-Yuan Cao Bin Peng Jin-Xia Wang

Predator–prey interactions play major and direct roles in the structuring of zooplankton communities. Asplanchna usually predates ciliates, rotifers, cladocerans and sometimes even copepods, its predation may drive not only the ecological, but also the evolutionary dynamics of prey populations. In the present study, the life-table demography and the population growth of Asplanchna brightwelli w...

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