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Microbial control of the fruit tree leafroller,Archips argyrospila [Lep.: Tortricidae] in California

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Abstract

Field populations of larvae of the fruit tree leafrollerArchips argyrospila (Wlk). were practically eliminated following spray application ofBacillus thuringiensis Berliner serotype III at 192 and 80×106 I.U. per litre on the host trees,Cercis occidentalis. Spray applications of lower rates ofB. thurienginsis serotype III at 18.9 and 32.1×106 I.U. per litre and mist application ofB. thuringiensis serotype 1 at 8.0 and 16.0×106 I.U. per litre gave partial control of populations ofA. argyrospila larvae. A granulosis typeBaculovirus, applied by hand sprayer at 1.4×109 granules/ml produced approximately 50% reduction of 5th instarA. argyrospila larvae onC. occidentalis trees. It was concluded thatB. thuringiensis and the granulosis typeBaculovirus are promising control agents forA. argyrospila larvae.

Résumé

Des populations naturelles de la tordeuse des arbres fruitiersArchips argyrospila (Wlk). ont été pratiquement éliminées à la suite de pulvérisations deBacillus thuringiensis Berliner, sérotype III à raison de 192 et 80.106 unités internationales par litre sur les arbres hôtes,Cercis occidentalis Torr. Des traitements à plus faibles doses deB. thuringiensis, sérotype III (18,9 et 32,1.106 unités internationales par litre) et l'application par atomiseur deB. thuringiensis sérotype 1 à 8 et 16.106 unités internationales par litre ont abouti à des résultats partiels. Une granulose àBaculovirus appliquée au pulvérisateur à main à la dose de 1,4.109 granules par ml a provoqué environ 50% de mortalité des larves du 5e stade sur les arbres. II apparaît done queB. thuringiensis et la granulose sont des agents valables pour la lutte contre les larves deA. argyrospila.

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Authors and Affiliations

  1. Department of Entomological Sciences, University of California, 94720, Berkeley, California, U.S.A.

    D. E. Pinnock & J. E. Milstead

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  1. D. E. Pinnock
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  2. J. E. Milstead
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Pinnock, D.E., Milstead, J.E. Microbial control of the fruit tree leafroller,Archips argyrospila [Lep.: Tortricidae] in California. Entomophaga 23, 203–206 (1978). https://doi.org/10.1007/BF02371729

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