Insecticides with different action on control of grape berry moths [Vitis vinifera L. - Piedmont]
2000
Lembo, S. | Morando, A. | Morando, D. | Ravizza, G. (VitEn, Calosso, Asti (Italy))
Efficacy tests against grape berry moths (Lobesia botrana 80-85% and Eupoecilia ambiguella) were carried out on a Chardonnay Casarsa growing method vineyard, in Piedmont, in the area of Monferrato during the years 1998 and 1999. In 1998, with 69% grapes of the untreated spot injured, all the products tested succeeded in reducing the damages in a significant percentage, yet showing outstanding differences in efficacy. The best results were obtained with the phosphoric esters, with the biological preparation and grow regulators, while the summer oil and in particular pyrethrum controlled a lesser number of larvae. In contrast, in 1999, due to a very strong attack (98.7% bunches injured on the untreated spot with 7.5 berries with holes for each bunch), the action of the products tested, even if relevant, was less effective, leaving way to the grape berry moths that damaged from 53 to 90% bunches. The cause of the failure is due to both the aggressive action and diffusion of the larvae and the growing method of the vineyard, where the thick vegetation, caused by the absence of any summer pruning, prevented the insecticide suspension, even if given with particular care, from reaching the bunches
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