Persistence behaviour of fungicide mixture (benalaxyl-M 4% + mancozeb 65%) WP in grapes.
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.
Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur Nadia, 741252 West Bengal, India.
Chiranjit
C
Kundu
Arnab
A
Goon
Anjan
A
Bhattacharyya
D000409:Alanine / Q000031:analogs & derivatives* / Q000032:analysis; D005506:Food Contamination; D005659:Fungicides, Industrial / Q000032:analysis*; D006207:Half-Life; D007700:Kinetics; D008344:Maneb / Q000032:analysis*; D008956:Models, Chemical; D010573:Pesticide Residues / Q000032:analysis*; D018570:Risk Assessment; D027843:Vitis / Q000737:chemistry*; D015038:Zineb / Q000032:analysis*
D005659:Fungicides, Industrial; D010573:Pesticide Residues; D008344:Maneb; C052866:benalaxyl; D000409:Alanine; C013099:mancozeb; D015038:Zineb