نتایج جستجو برای: natural enemy

تعداد نتایج: 485279  

Journal: :Japanese Journal of Applied Entomology and Zoology 2001

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2003
Kerry M Oliver Jacob A Russell Nancy A Moran Martha S Hunter

Symbiotic relationships between animals and microorganisms are common in nature, yet the factors controlling the abundance and distributions of symbionts are mostly unknown. Aphids have an obligate association with the bacterium Buchnera aphidicola (the primary symbiont) that has been shown to contribute directly to aphid fitness. In addition, aphids sometimes harbor other vertically transmitte...

2012
Yuya Fukano Tetsukazu Yahara

The evolution of increased competitive ability hypothesis (EICA) predicts that when alien plants are free from their natural enemies they evolve lower allocation to defense in order to achieve a higher growth rate. If this hypothesis is true, the converse implication would be that the defense against herbivory could be restored if a natural enemy also becomes present in the introduced range. We...

2005

A fundamental shift in performance often needs a radical change in the way an organisation is managed.Today’s NHS faces significant challenges, not least the need to maximise the use of the available resources and to demonstrate sound financial management. Recent developments such as payment by results and the introduction of a national tariff have only added to the pressure.To exacerbate this,...

Journal: :BMJ 2004

Journal: :American Journal of Islam and Society 2004

2011
Pascal D. Leroy Ahmed Sabri Stéphanie Heuskin Philippe Thonart Georges Lognay François J. Verheggen Frédéric Francis Yves Brostaux Gary W. Felton Eric Haubruge

Aphids are one of the most serious pests of crops worldwide, causing major yield and economic losses. To control aphids, natural enemies could be an option but their efficacy is sometimes limited by their dispersal in natural environment. Here we report the first isolation of a bacterium from the pea aphid Acyrthosiphon pisum honeydew, Staphylococcus sciuri, which acts as a kairomone enhancing ...

Journal: :Journal of economic entomology 2014
J L Woods D G James J C Lee D B Walsh D H Gent

The temporal development of biological control of arthropod pests in perennial cropping systems is largely unreported. In this study, the development of biological control of twospotted spider mite, Tetranychus urticae Koch, and hop aphid, Phorodon humuli (Schrank), in a new planting of hop in Oregon is described over a period of 9 yr (2005-2013). Both the abundance and diversity of natural ene...

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