HEAT ALERT! For deliveries during hot weather please have coolers with cold packs ready with a note--FedEx/UPS drop here. HEAT ALERT! For deliveries during hot weather please have coolers with cold packs ready with a note saying 'FedEx/UPS drop here' if not available to accept delivery.

Steinernema feltiae nematodes


TARGET PESTS: Fungus gnat larvae, Western Flower Thrips pupae and other insects in the Diptera order. 

FOR YOUR FILES: Beneficial Nematode Tech Sheet (PDF)

Applying Sierra Nematodes (PDF)

Sierra Nematode Targets (PDF)

Get more information on using beneficial nematodes here.

  • Steinernema feltiae will actively search through the substrate for prey. They work in cooler weather and will survive and infect hosts in temperatures as low as 50F. Controls fungus gnat larvae and Western Flower Thrips pupae. 
  • A complete life cycle takes 12 to 15 days at room temperature. Media temperatures should be above 50F but not more than 80F. Optimum media temperatures are between 60-70F. The nematodes enter the insect pest through body openings. Once inside they reproduce and release a symbiotic bacterium which is toxic to the host. The pests are killed within a few days and a second generation of infective juvenile nematodes exit the host and begin the cycle again. 
  • Entomopathogenic nematodes are supplied as infective juveniles, which are usually applied as a soil drench. Not all nematodes are alike. They specialize in which pests they attack and kill and are effective at different temperatures.
  • Beneficial nematodes come in two forms. Sponges that are pre-inoculated with infective juveniles in quantities of 1 million, 6 million and 24 million. Generally, in a greenhouse setting, apply these beneficial nematodes at a rate of 1 million per 1,000 sq. ft. The sponge product has a completely unique application rate as the bacterial level is much higher because they are produced in vivo.

    Trays that contain 50 million or 250 million. Release every 2-3 weeks at a rate of 50 million/1100 sq. ft. or every 4-6 weeks at a rate of 50 million/550 sq. ft.  Use 30-50 gallons of water/1000 sq. ft. for applications onto soil or growing media.

  • Apply nematodes with a sprayer, injector, hose end sprayer or even a watering can. Plug trays can be dipped in a nematode solution. If using an injector, set the dilution to 1:100. It is important to remove all filters or screens (50 mesh or finer) in any spray lines so that the nematodes can pass through unimpeded and undamaged. Keep spray pressure below 300 psi. For every square foot you will need .66 gallons of water as the carrier. Saturate soil or potting media to a depth of 2". See Nematode Tech Sheet for further information.

Orders for Greenhouse Blend Nematodes must be received by noon on Friday for shipment the following week.  If the deadline is past, please call us and we will help you find a solution ASAP. (360) 656-6680

See order deadlines and shipping information.

Learn about release instructions for beneficial insects.

Back to top