BeneficialRoot maggots
Nematodes for root maggots
Steinernema feltiae · nematode
Against root maggots
UMass reports that S. feltiae worked against cabbage maggot in trials even in soil at 50 °F. Cornell work found only 100,000 or more per plant prevented significant root loss, and a Belgian trial found spraying the plant trays placed the nematodes better than drenching the soil. Keep the soil moist. It is a supplement to row covers and timing, not a replacement.
Rate100,000–125,000 infective juveniles per transplant (UMass, from trials)
TimingOn the transplant tray before planting, or as a drench at planting; repeat if the fly arrives more than a week later
Temperature10–30 °C
macro · entomopathogenic nematode on root maggots
The pestRoot maggotsDelia spp. & Chamaepsila rosaeSeedlings and transplants that wilt and die; tunnelled roots, bulbs and carrotsFull pest profile →Before you order
Drenched into moist media against larvae in the root zone. How it works, how to tell it has established and the supplier list are on the full Steinernema feltiae profile.
Release calculator
How many do I need?
Area and infestation level in; quantity, cost and a weekly schedule out. Open the calculator →
Other controls for root maggots
- Rove beetlesWild predator · Nothing to release — conserve them
- Ground beetlesWild predator · Nothing to release — give them cover