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Rainfastness and Efficacy of Spray Deposits of Cypermethrin on Neonate Codling Moth Larvae, Cydia pomonella

Published online by Cambridge University Press:  19 September 2011

Kwame Afreh-Nuamah
Kwame Afreh-Nuamah
Affiliation:
International Pesticide Application Research Centre, Imperial College at Silwood Park, Ascot, Berkshire
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Abstract

Seedlings of apple variety, Yarlington mill, were sprayed with different sprays containing 0.1% cypermethrin, and were subjected for 15 min to 65.3 mm artificial rainfall. The effectiveness of deposits after rainfall were tested in the laboratory with neonate codling moth larvae.

Cypermethrin formulations sprayed with each nozzle were more persistent after artificial rain, when small droplets of volume median diameter (VMD = 30–70 μm) were applied by spinning discs (charged or uncharged) compared with larger droplets (VMD* = 90–160 μm) produced by air shear nozzle. No significant difference in effects was obtained between droplets by either charged or uncharged disc.

Résumé

Plantules du pomme variété Yarlington mill ont été pulvérisés par des pulvérisants différents contenant 0.1 pourcent de cypermethrin. Quelques plantules pulvérisés ont été choisies au hassard et exposées pendant 15 minutes à une pluie artificielle de 65.3 mm.

Des feuilles ont été prises au hassard de chaque groupe de plantule (avec et sans pluie) et les effets de retenu deposé ont été testé au laboratoire avec Cydia pomonella larve.

Formulations de cypermethrin pulvérisé par chaque bec ont été plus persistants aprés la pluie artificielle; quand des petites goutteiettes (VMD = 30–70 μm) ont été appliquées gouttelettes (VMD = 90–160) μm produites par bec air tondu.

Pas de difference significante n' a été obtenu entre gouttelettes par soit disque roulant.

Keywords

Rainfastnessspraycypermethrinartificial raincodling mothformulations
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 5 , October 1988 , pp. 583 - 585
Copyright
Copyright © ICIPE 1988

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References

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