title: Persistence of trifloxystrobin and tebuconazole on grape leaves, grape berries and soil.
abstract: Following four foliar applications of Nativo 75 WG (trifloxystrobin 25% + tebuconazole 50%) on grapes @ 175 and 350 g/ha, resulting in active applications of trifloxystrobin @ 43.75 and 87.5 g a.i./ha and that of tebuconazole @ 87.5 and 175 g a.i./ha, the average initial deposits of trifloxystrobin were observed to be 7.76 and 15.53 mg/kg, respectively, at single and double the application rates. These residue levels dissipated to >85% after 10 days of its application at both the dosages. Similarly, the average initial deposits of tebuconazole were observed to be 13.84 and 26.55 mg/kg at single and double the application rate, respectively. These residue levels dissipated to >90% after 10 days of application at both the dosages. The half-life (t(1/2)) periods of trifloxystrobin on grape leaves were observed to be 2.92 and 3.48 days at single and double application rates, respectively, whereas these values were 2.68 and 3.96 days for tebuconazole. Ripe grape berries and soil samples collected at harvest which happened to be 34 days after the last application, did not show the presence of residues of trifloxystrobin and tebuconazole at their determination limit of 0.01 and 0.02 mg/kg, respectively.
authors.affiliation: Department of Entomology, Punjab Agricultural University, Ludhiana, Punjab, 141004, India. chitsibrar2002@rediffmail.com
authors.forename: Gagan
authors.initials: G
authors.lastname: Jyot
authors.forename: Parshotam Kumar
authors.initials: PK
authors.lastname: Arora
authors.forename: Sanjay Kumar
authors.initials: SK
authors.lastname: Sahoo
authors.forename: Balwinder
authors.initials: B
authors.lastname: Singh
authors.forename: Raminderjit Singh
authors.initials: RS
authors.lastname: Battu
mesh_terms: D000085:Acetates / Q000032:analysis*; D005659:Fungicides, Industrial / Q000032:analysis*; D006207:Half-Life; D007097:Imines / Q000032:analysis*; D008689:Methacrylates / Q000032:analysis; D018515:Plant Leaves / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D000073739:Strobilurins; D014230:Triazoles / Q000032:analysis*; D027843:Vitis / Q000737:chemistry*
chemical_list: D000085:Acetates; D005659:Fungicides, Industrial; D007097:Imines; D008689:Methacrylates; D012989:Soil Pollutants; D000073739:Strobilurins; D014230:Triazoles; C087114:tebuconazole; C467051:trifloxystrobin