Onion seed-Maggot

Includes

Bean seed maggot (Delia florilega)
Onion maggot (Delia antiqua)
Seedcorn maggot (Delia platura)

Pest description and crop damage Adult is a fly with a gray body and black legs, less than 0.25 inch long. Larvae are legless, blunt, white maggots that feed on seeds and reduce onion stands. They sometimes damage bulbs of mature plants.

Management-chemical control

  • azadirachtin (Neemix 4.5) at 10 to 12 fl oz/a (0.031 to 0.037 lb ai/a). PHI 0 days. REI 4 hr. In most cases, apply at high rate. Effective on larval or immature stages only. This botanical pesticide acts slowly. Spray early and check for effect. Repeat in 7 to 10 days as needed. Some formulations are OMRI-listed for organic production.