Phorate and Demeton for Control of the Pea Leaf Miner on Sugarbeets

Studies on the effect of phorate and demeton on the control of the pea leaf miner, Liriomyza langei Frick, on sugarbeets demonstrated a marked reduction in damage inflicted by these insects in all treated plots. Plants in phorate-treated plots showed very little evidence of injury, having only small numbers of feeding punctures and very few mines. Demeton-treated plots were intermediate in damage between the phorate and control plots. Phorate applied as a seed treatment was effective in preventing punctures and the formation of mines on sugarbeet seedlings for 30 days after planting.