Aphids as crop pests by Helmut van Emden, Richard Harrington PDF

By Helmut van Emden, Richard Harrington

Aphids characterize one of many world's significant insect pests, inflicting severe monetary harm to more than a few temperate and tropical plants. those diversity from grain plants and brassicas to potato, cotton, vegetable and fruit vegetation. This e-book offers a definitive reference quantity at the biology of aphids, their pest prestige, and the way to regulate them. It comprises nearly 30 particularly commissioned chapters from global specialists, largely from Europe and North the US. subject matters coated diversity from host choice and feeding to flow and dispersal, and from insecticide resistance to chemical, cultural and organic keep an eye on equipment. There also are numerous case research chapters, on built-in pest administration in particular crops.

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The name Myzus persicae, for example, identifies a set of populations that are closely related and share numerous attributes. But this must not be allowed to mask the heterogeneity that is also present, and which may in particular include populations that have diverged genetically to such an extent that they have evolved past the stage of being host races and achieved a degree of permanency, so that they can be regarded as incipient or sibling species (or subspecies) with particular attributes of their own.

In cold temperate regions, it is holocyclic, producing oviparae and males on various leguminous hosts. As in other members of the genus Acyrthosiphon, there is no true host alternation. The ancestral primary host was presumably a member of the Rosaceae, as in related genera, but this was probably lost long ago. Clones may produce either apterous or alate males, or both. At warmer latitudes, it overwinters without a sexual phase. In Europe and Central Asia, A. pisum seems to be a complex of races and subspecies with different host ranges and preferences (Müller, 1980, 1985).

2000a). However, the degree of isolation must have been sufficient to preserve the integrity of the tobacco-adapted genome for at least 15–20 years, and it would be unwise to regard this form simply as synonymous with M. persicae, as suggested by Clements et al. (2000a,b), as this would lose important information. The nomenclatural problem can perhaps now be resolved, because the tobacco aphid conforms to the broader criteria for the subspecies category proposed by Müller (1986), and defined earlier in this chapter.

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