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Effects of wheat foliar fungicides on the aphid endoparasitoid Aphidius rhopalosiphi DeStefani-Perez (Hym., Aphidiidae) on glass plates and on plants


  • Jansen, J.P. (1999). Effects of wheat foliar fungicides on the aphid endoparasitoid Aphidius rhopalosiphi DeStefani-Perez (Hym., Aphidiidae) on glass plates and on plants. Journal of Applied Entomology, 123: (4), 217-223.
Type Journal Article
Year 1999
Title Effects of wheat foliar fungicides on the aphid endoparasitoid Aphidius rhopalosiphi DeStefani-Perez (Hym., Aphidiidae) on glass plates and on plants
Journal Journal of Applied Entomology
Label Jansen 1999 tap 507
Recnumber 145
Volume 123
Issue 4
Pages 217-223
Endnote Keywords fungicides|wheat|beneficial insects|carbendazim|chlorothalonil|cyproconazole|fenpropidin|fenpropimorph|flusilazole|formulations|hexaconazole|parasitism|parasitoids|pesticides|prochloraz|propiconazole|repellents|synergism|tebuconazole|control|triadimenol|t
Abstract The side-effects of several fungicides used in wheat to control disease at heading growth stage were assessed on the aphid parasitoid Aphidius rhopalosiphi by tests conducted in the laboratory on glass plates and in the greenhouse on young wheat plants. Very few formulations containing only one active ingredient (carbendazim, cyproconazole or epoxyconazole) or combinations of two (carbendazim + cyproconazole, carbendazim + hexaconazole) were harmless to A. rhopalosiphi in the glass-plate tests. There was no apparent synergism between fungicides tested in combinations. The parasitoid mortalities in tests carried out on plants were less and chlorothalonil, epoxyconazole, fenpropidin, fenpropimorph, flusilazole, flutriafol, prochloraz, tebuconazole, tridemorph and a number of combinations (carbendazim + flutriafol. chlorothalonil + cyproconazole, epoxyconazole + tridemorph. chlorothalonil + hexaconazole, chlorothalonil + flutriafol. cyproconazole + prochloraz, epoxyconazole + fenpropimorph, fenpropimorph + propiconazole, propiconazole + tridemorph. triadimenol + tridemorph) were harmless or only slightly harmful to the aphid parasitoid. Several combinations (carbendazim + epoxyconazole, carbendazim + fenpropimorph, carbendazim + flusilazole. carbendazim + tebuconazole, chlorothalonil + fenpropimorph, chlorothalonil + flusilazole, fenpropimorph + fenpropidin, fenpropimorph + prochloraz, fenpropidin + propiconazole, fenpropidin + tebuco nazole, tebuconazole - triadimenol) were toxic for wasps on plants. The parasitoid mortalities were less on plants than on glass plates but the wasps spent less time on treated leaves and in some cases parasitism of aphids was reduced to a large extent. These results suggest that in addition to study of the direct effects of pesticides on beneficial insects (mortalities, reduction of fertility) their effects on the behaviour of the insects should also be studied. Products that induced a repellent effect need further testing in field or semi-field conditions. However, many fungicide combinations that have little or no effect on A. rhopalosiphi can protect wheat against a wide range of diseases and the results obtained in this study indicate that an appropriate and effective protection of wheat at earing growth stage can be achieved with products that have no effects on aphid parasitoids.
Notes Cited Reference Count: 18 ref.Journal articleEnglish
Author address Agronomic Research Centre, Department of Biological Control and Plant Genetic Resources, Gembloux, Belgium.
Fichier TAP_507_-_Jansen,_1999,_J__Appl__Ent__123,_217-2231.pdf
Authors Jansen, J.P.