Searles Copper Oxychloride is an effective broad-spectrum protectant fungicide with low risk of resistance development, due to the copper mechanisms of multiple action. Copper is actively accumulated in the fungal spores, inhibiting germination, even at very low concentrations. It is particularly effective against blight, scab, freckle, and bacterial speck to name a few. Active Constituent: 500g/kg Copper (Cu) present as Copper Oxychloride