Effect of soil applied systemic insecticides on yield of Norland potato

The effects of systemic phosphate insecticide applications in the fertilizer band at planting were studied on Norland variety potatoes grown on irrigated Plainfield sand for 3 years while the effects of systemic carbamate insecticides were studied for 2 years. Systemic carbamate and phosphate insecticides were studied on Norland variety potatoes grown on non-irrigated Parr silt loam for 2 years. A trend toward increased tuber yield over the untreated control when systemic carbamate insecticides were applied and decreased yield when systemic phosphate insecticides were applied on the irrigated Plainfield sand was evident. All systemic insecticide treatments yielded significantly more tubers than did the untreated conrol on the non-irrigated Parr silt loam.