fascicolo / issue 1 - CRA-PAV

Petria 20 (1), 1-72 (2010) – Atti Convegno - Ancona, 26 Febbraio/February 2010metallic Cu 2+ , WP formulation). The reference product was applied at a rate of 70 g/hlof metallic Cu 2+ . In Trial 2, Ramsol F2 was compared to a tank-mix of sulphur (Tiovit,80%, WP) and copper oxychloride (Cuprocaffaro, 50%, WP), which were applied atrates of 36 g a.i./hl and 150 g a.i./hl, respectively.The trial designs were randomized complete blocks with 4 replicates. The plotsize was 4 x 6 m, with 5 plants/plot. The plots were sprayed several times usinga Maruyama MS knapsack motorpump. The assessments were carried out on the 3central plants of each plot. At the end of the application cycles, disease incidenceand severity were evaluated on leaves and bunches. The data were transformed withan ARCSIN formula, and the effectiveness (Abbott, as % of control) was analyzedstatistically using Duncan’s mean separation test. For both of the trials, 7-day sprayinterval was followed. In the first trial, the applications covered a period from 12 Mayto 3 September; in the second trial, from 11 May to 3 August.In the first trial, due to the high temperatures recorded during the trial period,artificial inoculations were carried out with 1.5 x 10 5 spores/ml of P. viticola, followedby controlled irrigation with a misting system. The pressure of the infection wasrecorded as relevant starting from the end of June, and it reached its maximum levelsat the end of August, when in the untreated plots it was assessed as 44% for infectedleaves and 30.6% for infected bunches. The products tested showed significant activity,differing from the the untreated control. Both experimental measures (percentages ofeffectiveness of 56.1% and 54.5%, respectively) did not differ statistically from thereference compounds (effectiveness, 70.1%).In the second trial, the first symptoms of the target disease were recorded on thecrop at the end of June. Considering the incidence of the fungal disease in the untreatedcontrol of 23.0% of infected leaves, the tank-mix of sulphur and copper oxychlorideobtained statistical better outcomes (effectiveness, 98.0%). The test product RamsolF2 (effectiveness, 74.1%) showed significant and agronomically acceptable activity,even if the applied Cu+S amount was 4 times lower than the reference compound. Nophytotoxicity symptoms were ascribable to the activities of the products under testduring the course of both trials.The trials showed the possibility of controlling downy mildew on grapevineusing copper-based formulations, with a relevant reduction in copper concentrationper ha, in accordance with the requirements of the European legislation.Key words: Copper, Crop protection, Vitis vinifera.54