Degradation of spinosad in vinification grapes
Abstract
Lobesia botrana is a pest that attacks mainly the cultivation of the vine in Argentina, therefore it is essential to carry out controls to avoid losses in production. However, the use of insecticides can generate residues in the grape. In order to achieve an innocuous end product, suitable for consumption and competent in national and international markets, without exceeding the tolerances required, it is necessary to know the dissipation of insecticides in a field. The objective of the present work analyzed the dynamics of the degradation of the insecticide spinosad. The trial carried out at the Experimental Agricultural Station INTA Mendoza in 2016, on a vineyard plot of Cabernet Sauvignon. Spinosad 48% SC was applied with a Stilh 420 SR pneumatic backpack at a dose of 15 ml hl-1. Samples were taken at 0, 7, 14, 21 and 28 days after application (DAA). An extraction technique based on the Luke method was used for the extraction of the pesticides from the grape and subsequently analyzed in an MS-MS Waters liquid chromatograph. The results showed that the degradation model responds to a negative exponential model with an R2 of 0.92. The initial deposit was below the Maximum Residue Limit of spinosad for Argentina (0.5mg kg-1). In conclusion spinosad had a rapid degradation, allowing reaching non-quantifiable or detectable levels of residues after 14 days of application.
Issue: GiESCO 2017
Type: Extended abstract
Authors
1 INTA Estación Experimental Mendoza- San Martín 3853, Luján de Cuyo, Mendoza, Argentina
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Keywords
Lobesia botrana, pesticide residues, vine, spinosad, degradation