Persistence Behaviour of Cu-oxychloride 37.5% WDG in Potato

Potato suffers from different pathological maladies out of which late blight is one of the major. Cu-oxychloride controls it successfully. Copper when applied in the form of fungicide accumulated in surface layers of soil and became toxic to susceptible plants. The present field study on potato (variety- Kufri Jyoti) during December 2007 to March 2008 was made to understand the dissipation pattern as well as residual fate of Cu-oxychloride in potato leaf and field soil when it is applied simultaneously in the form of a formulation Cu-oxychloride 37.5% WDG following a single application @ 1125 g. a.i. ha⁻¹ (T₁) and @ 2250 g. a.i. ha⁻¹ (T₂) along with untreated control (T₃). The half life values of Cu-oxychloride in potato leaf and field soil sample were found to be in the range of 16.72 to 17.71 days and 20.06 to 25.08 days respectively.