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Persistence behaviour of fungicide mixture (benalaxyl-M 4% + mancozeb 65%) WP in grapes.

Bulletin of environmental contamination and toxicology (2012-10-12)
Chiranjit Kundu, Arnab Goon, Anjan Bhattacharyya
ABSTRACT

Benalaxyl-M [methyl N-phenylacetyl-N-2, 6-xylyl-DL-alaninate] is a newly introduced phenyl-amide fungicide whereas Mancozeb is one of the member of ethylenebisdiothiocarbamate (EBDC) fungicide. Benalaxyl-M in combination with Mancozeb effectively controls downy mildew of grapes. A two season field trial was conducted under West Bengal climatic condition during 2009-2010 to evaluate the dissipation pattern of fungicide mixture (Benalaxyl-M 4 % + Mancozeb 65 %) WP in grapes at two application rates (2,750 g and 5,500 g ha(-1)). The quantitative analysis was performed using liquid chromatography-mass spectrometry (LC-MS/MS) and UV-Vis spectrophotometer for Benalaxyl-M and Mancozeb residues respectively. Following the first order kinetics the fungicide Benalaxyl-M dissipates in grapes with half-life (T(1/2)) value ranges between 2.59 and 2.79 days irrespective of seasons and doses. The dissipation pattern of Mancozeb also follows first order kinetics with half-life (T(1/2)) value ranges between 3.86 and 4.93 days irrespective of seasons and doses.

MATERIALS
Product Number
Brand
Product Description

Supelco
Zineb, PESTANAL®, analytical standard
Supelco
Mancozeb, PESTANAL®, analytical standard
Supelco
Maneb, PESTANAL®, analytical standard
Supelco
Benalaxyl, PESTANAL®, analytical standard
Supelco
Benalaxyl-M, PESTANAL®, analytical standard