Time of concern: Late April through June. Seed sprouting through emergence
Key characteristics: Adult flies are slender, 3/8 inch long, and grayish black in color. Maggots are yellowish white. Infested seeds and other plant parts are hollowed out. Damaged plants are weak and may not develop. Stand may be poor.
- Pests of the Northeastern United States: Seedcorn Maggot - Damage to Sweet Corn
- Pests of the Northeastern United States: Seedcorn Maggot (Delia platura) - Life Cycle
- Organic management of SCM in sweet corn, page 69 in Resource Guide for Organic Insect and Disease Management
No thresholds have been established.
|Resistant varieties||No resistant varieties are available.|
|Site selection||Root maggot adults prefer soil with decomposing organic matter. Incorporate crop or cover crop residues well before planting and allow 2-3 weeks between incorporation and planting. Do not spread manure directly before planting. Avoid low, wet areas. The threat of seedcorn maggot diminishes greatly if the crop is planted after the third week in June.|
|Seed selection/treatment||Buy treated seed or use an insecticide at planting.|
|Note(s)||Shallow planting and other means to speed up germination and emergence will reduce damage.|
|These are not currently viable management options.|
|Pesticides||Cornell Integrated Crop and Pest Management Guidelines for Commercial Vegetable Production|