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EFFECTS OF APPLICATION DATE ON THE PERSISTENCE OF CLOFENTEZINE RESIDUES: IMPLICATIONS FOR MANAGEMENT OF RESISTANCE IN THE EUROPEAN RED MITE

Published online by Cambridge University Press:  31 May 2012

D.B. Marshall ,
D.J. Pree ,
B.D. McGarvey  and
H.M.A. Thistlewood
D.B. Marshall
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
D.J. Pree
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
B.D. McGarvey
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
H.M.A. Thistlewood
Affiliation:
Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0
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Abstract

The effects of timing of applications on the persistence of chemical and biologically active residues of clofentezine were tested on apple foliage during two seasons. Residues from prebloom and petal fall applications were less persistent than those in mid-season. Early season applications were toxic to European red mite for 7–21 days but mid-season applications were toxic for as long as 50–62 days. Chemical residue losses were also faster in the early season. Persistence of chemical residues was related to the rate of leaf growth and expansion. In 1991, foliage area expanded 244% per week during the prebloom period, 23% per week at petal fall, and 10% per week in July (mid-season).In a field test, applications of clofentezine at petal fall reduced European red mite populations within 7 days and mite numbers remained below economic thresholds for 6 weeks.

Résumé

L’influence de la date d’application du clofentezine sur la persistance des effets chimiques et biologiques du produit a été testée durant deux saisons sur des feuilles de pommier. Les résidus d’une application effectuée avant la floraison ou durant la tombée des pétales sont moins persistants que les résidus d’une application effectuée à la mi-saison. Après une application hâtive, le produit reste toxique pour le tétranyque durant une période de 7–21 jours, alors qu’il reste toxique durant 50–62 jours après une application à la mi-saison. Les résidus chimiques disparaissent également plus rapidement après une application tôt dans la saison. La persistance des résidus est reliée à la vitesse de croissance et d’ouverture des feuilles. En 1991, la surface du feuillage a augmenté de 244% par semaine avant la floraison, de 23% par semaine au moment de la tombée des pétales et de 10% par semaine en juillet (mi-saison).Au cours d’un test sur le terrain, des applications de clofentezine au moment de la tombée des pétales ont entraîné une réduction des populations de Tétranyques rouges du pommier après moins de 7 jours et le nombre d’acariens est demeuré sous le seuil de production de dommages économiques pour 6 semaines.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 4 , August 1994 , pp. 937 - 947
Copyright
Copyright © Entomological Society of Canada 1994

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