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The Effect of Weather on Frit Fly (Oscinella frit L.) and Its Predators

Margaret G. Jones
Journal of Applied Ecology
Vol. 6, No. 3 (Dec., 1969), pp. 425-441
DOI: 10.2307/2401509
Stable URL: http://www.jstor.org/stable/2401509
Page Count: 17
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The Effect of Weather on Frit Fly (Oscinella frit L.) and Its Predators
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Abstract

Weather at the critical times of oviposition, larval penetration and emergence determines the numbers of frit flies on oats. In unfavourable weather females shelter in spaces in the soil. Ground-living predators are also less active during cold, wet weather. Predation occurs only to a small extent on exposed stages of the life history. Small non-specific egg feeders such as Bembidion lampros, Trechus quadristriatus, Tachyporus spp., and the mite Pergamasus longicornis may eat frit fly eggs. All stages of the panicle generation may be preyed on by Anthocoris nemorum. Adult frit flies of all generations may be caught by dipterous predators normally present in the habitat. The commonest were Tachydromia spp. (Empidae), Scatophaga stercoraria (Cordyluridae) and Medeterus truncorum (Dolichopodidae). When the weather is good for oviposition of frit fly the combined activity of predators and parasites is not enough to protect late-sown oats. Spraying twice with parathion in the 2-3 leaf stage is effective; alternatively the sprays can be applied to the soil before the crop is sown.

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