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Entomophaga

, Volume 33, Issue 1, pp 87–99 | Cite as

The effects of foliar fungicides on beneficial arthropods in wheat fields

  • N. W. Sotherton
  • S. J. Moreby
Article

Abstract

Large scale replicated field trials were carried out over a 2 year period to quantify the insecticidal properties of 3 foliar fungicides commonly used in wheat fields. Pyrazophos significantly reduced the numbers of many groups of the natural enemies of cereal aphids and the insects known to be vital in the diet of gamebird chicks for up to 4 weeks after spraying. No such reductions were found after the use of either triadimefon or propiconazole.

Aphid numbers on plots sprayed with pyrazophos were twice the numbers found on unsprayed plots either 6 weeks after spraying in 1985 or on unsprayed plots and plots sprayed with the other fungicides 20 days after treatment in 1984. In 1985, this necessitated the additional use of an aphicide only on those plots previously sprayed with pyrazophos. The removal of chick food insects following the use of pyrazophos was considered to be sufficient to reduce survival rates of wild gamebird chicks.

Key-Words

propiconazole pyrazophos triadimefon resurgence beneficials chick-food 

Résumé

Des essais multiples de grande envergure furent menés sur le terrain pendant 2 ans afin de quantifier les propriétés insecticides de 3 fongicides foliaires utilisés couramment dans les champs de blé. Le pyrazophos réduisit de manière significative l'abondance de plusieurs groupes d'ennemis naturels des pucerons des céréales, ainsi que celle d'insectes reconnus comme indispensables dans le régime alimentaire des poussins de gallinacées sauvages, jusqu'à 4 semaines après le traitement. Ni le triadiméfon, ni le propiconazole ne produisirent des réductions semblables.

Le nombre de pucerons sur les parcelles traitées au pyrazophos était le double du nombre des pucerons présents sur les parcelles non traitées 6 semaines après traitement en 1985, et le double aussi de celui des pucerons présents sur parcelles non traitées et parcelles traitées aux autres fongicides 20 jours après traitement en 1984. En 1985, l'utilisation supplémentaire d'un pesticide sélectif pour pucerons ne fut nécessaire que sur les parcelles traitées auparavant au pyrazophos. Après l'utilisation du pyrazophos, la diminution du nombre d'insectes servant de nourriture aux poussins de gallinacées sauvages fut considérée comme suffisante pour abaisser le taux de survie des poussins.

Mots Clés

Propiconazole pyrazophos triadiméfon recrudescence insectes utiles nourriture de poussin 

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Copyright information

© Lavoisier Abonnements 1988

Authors and Affiliations

  • N. W. Sotherton
    • 1
  • S. J. Moreby
    • 1
  1. 1.The Cereals and Gamebirds Research ProjectThe Game ConservancyFordinbridgeUK

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