Control of Lobesia botrana in dessert grapes using different spraying techniques
2001
Val, L. | Torregrosa, A. | Molina, J.M. (Universidad Politecnica de Valencia (Spain). Dpt. Mecanizacion y Tecnologia Agraria)
In order to make localised pesticide applications to the racemes of high quality dessert grapes during late harvesting, hand held hydraulic guns of high flow rates are commonly used. This spraying technique has been used for a long time in spite of its drawbacks. At the production area of 'Valle del Vinalopo" (Valencia region, Spain), the feasibility of the use of this air-assisted sprayer with multiple oriented outlets has been studied. A comparison has been made between the biological efficiency of spraying techniques for both the controlling of the grape berry moth Lobesia botrana and for the distribution of different doses of microencapsulated parathion methyl. The treatments against Lobesia have been designed based on several aspects: application techniques (hand held guns versus air-assisted sprayers), volumes (1,300 vs 200 and 400 liter per ha) and quantity of pesticides applied by surface unit (4.4 vs 1.25 and 2.5 liter per ha). After the statistical analyses of the results, it can be found that it is very difficult to obtain the same level of control of the pest that was the achieved with traditional techniques. This can be explained by the lower quantity of both water and pesticide used in this test with the air-assisted sprayer. Comparing the performances of the air assisted sprayers; there are no significant differences in the efficacy between trials with 200 and 400 liter per ha. A positive correlation has been found between the quantity of pesticide distributed and the efficacy in pest control. The increase in the quantity of pesticide used reduced damages independent of the volume of water used.
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