Abstract: Abstract Treatment of soil infested with Pratylenchus penetrans using the nematicides phenamiphos, aldicarb, or carbofuran before bulb planting resulted in reduced nematode populations and improved plant growth 10 months after treatment. Phenamiphos was considered to have the greatest potential for long-term control because of its known persistent effects. Treatment of the soil with the fungicide metalaxyl to control Pythium sp. did not result in improved plant growth.