Abstract
Cydia pomonella (L.), a major pest of apples in Canadian orchards, is susceptible to a granulosis virus (CpGV). Orchard trials with different formulations of CpGV in Ontario, whereC. pomonella has two generations per year, indicated that as many as seven applications of virus would be needed to maintain the percentage of fruit with deep larval entries below 4%. In Nova Scotia, where there is only one generation ofC. pomonella per year, two applications of CpGV usually were needed although, in some cases, one sufficed. The protection of fruit conferred by CpGV equalled that by the organophosphate insecticides, azinphosmethyl or phosmet, in some tests. The advantages of a selective treatment, such as CpGV, over use of broad-spectrum insecticides are discussed.
Résumé
Cydia pomonella (L.), un ravageur important du pommier dans les vergers canadiens, est sensible au virus de la granulose. Des essais en vergers utilisant deux préparations de ce virus en Ontario, oùC. pomonella présente deux generations par année, indiquent qu'il faudrait jusqu'à sept pulvérisations pour maintenir à moins de 40% la proportion de fruits portant des infestations larvaires. En Nouvelle Ecosse, oùC. pomonella ne compte qu'une seule génération par an, deux pulvérisations furent nécessaires, quoique dans certains cas une seule a suffi. Dans certains essais, le niveau de protection des fruits égalait celui fourni par les esters phosphoriques, l'azinphos-méthyle ou le phosmet. On discute des avantages des traitements sélectifs tels que le virus de la granulose en comparaison avec l'emploi des insecticides de grande polyvalence.
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Jaques, R.P., Hardman, J.M., Laing, J.E. et al. Orchard trials in Canada on control ofCydia pomonella (Lep: Tortricidae) by granulosis virus. Entomophaga 39, 281–292 (1994). https://doi.org/10.1007/BF02373033
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DOI: https://doi.org/10.1007/BF02373033