Plant Pathology Department, G.B. Pant University of Agriculture & Technology, Pantnagar.
* Present address Plant Quarantine Unit, ICRISAT, Patancheru PO, PIN - 502 324, (A.P.).
Degradation and persistence of a systemic fungicide Brestanol (Triphenyl - tinchloride) known to be effective against Cercospora leaf spot of sugarbeet, was studied in sugarbeet seedlings. Thin layer chromatograms developed with 0.05% sodium fluorescein in methanol was found to be a reliable method for degradation and persistence studies. No degradation of Brestanol occurred in sugarbeet seedlings at 24 hours after treatment, however, it was converted into an entirely different compound with Rf value 0.2, 6 days after spraying. Brestanol sprayed at the rate of 450 ppm was detected at the quantity of 1.125 μg, 4 days after spraying.
