Problem Identifier Unit Screen//v.w/ RR Template

Problem Identifier Unit Screen//v.w/ RR Template Seedcorn Maggot

Problem
Seeds don't sprout, or the seedlings are weak and don't develop leaves. Pearly white worms, ¼ inch long, are feeding in the seeds. The seeds are hollow.

Analysis
(Hylemya platura)

Seedcorn maggots feed on seeds and seedlings. They are attracted to large-seeded vegetables such as peas, beans, and corn. The maggots are most numerous in cool periods in the spring and fall, and in cold soil that is high in organic matter. The black, hairy adult flies are attracted to the organic matter, and lay eggs in the soil. The maggots that hatch from these eggs burrow into the seeds and eat the inner tissue, leaving a hollow shell. Rot fungi may enter a damaged seed and further destroy it. After 1 to 2 weeks, the maggots burrow deep into the soil and pupate. The adult flies that emerge feed on nectar and plant juices before laying more eggs. There are several generations a year. In warm-winter areas, these pests are active all year. In cold-winter areas, they survive the winter as pupae, emerging as adults in the early spring.

Solution
Treat seed with an insecticide powder that contains diazinon. Mix ¼ teaspoon of insecticide with each packet of seed. Shake off the excess, and plant the seeds 1 to 2 inches deep. Since adult flies are attracted to organic matter, don't add manure to the soil in the spring when planting beans, peas, or corn.

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