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Nematodes (Heterorhabditis bacteriophora nematodes)

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GMnematodes
Regular Price: $39.99
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These are live insects, and in order to increase survival rate during transit, they are required to be shipped Overnight, which adds on an additional $30 to the total. Orders are shipped within 4 to 6 business days from the order date.

Control Grubs and Gnats with Parasitic Nematodes

These nearly-microscopic non-segmented roundworms called nematodes live in the soil and spend their lives exploiting the larvae and/or pupae of over 200 organisms for their own gain. They are entomogenous (en-toh-MAH-jen-us), meaning they develop on or within an insect. (see how to apply, store, etc at very bottom of page)

Nematode Information:
  • Popular Prey: fungus gnat larvae and many more economically important critters (just about anything they can crawl in, except other nematodes)
  • Life-span: roughly 8 weeks all together — assuming the wax worm larva is the host used.
  • Optimal Living Conditions: soil temperatures between 79-83°F for Hb with a low end of 65°F and prefer the soil, soilless medium, rockwool or other substrate, etc., to be moderately moist
  • Usages: Greenhouses, fields, interiorscapes, orchards and gardens. I’ve seen the successful implementation of these species in just about every conceivable situation. This includes just about every conceivable media: soil/sod, peat-lite mixes, bark products, rockwool, etc
  • Nematodes are extremely sensitive to UV rays (sunlight) and it can make them sterile in only 7 minutes, then kill them. For this reason, they should be applied in the evening or nighttime or light rain
  • You can tell your nematodes are working if the grubs are 1) dead, 2) partially deteriorated — depending on how long after initial host entry they were discovered — and/or 3) tinged orange-red
  • This species of nematode will bear up to 200,000 young ‘uns beginning in as little as 9 days
  • They are very versatile and can be applied in many ways
  • Nematodes will not harm people or animals, not even earthworms — they’re kin.
  • Can be refrigerator stored up to 1 months!


  • Each order contains 5 mil. (in a plastic bag)

    How they work:
  • This nematode species physically enters the host (grub, maggot, larva) and kills from within (endoparasitism). Entry is gained via the host’s mouth, anus or spiracles (breathing holes located along the sides of an insect). The Hb nematode, with its well structured and muscular, beak-containing head also has the ability to enter through the host’s soft, side-wall tissue.
  • In the case of the Hb nematode, they simply search the soil, tracking down their host, slithering along the film of moisture surrounding the medium’s particulate matter, sampling as they go.
  • Once inside the host, the nematodes settle in, shed a protective cuticle, mature, and begin feeding, defecating and reproducing. In their fecal matter lives a symbiotic bacterium enjoying the perfect harmony of interdependency with the nematodes. The bacterium present in the fecal matter of Hb nematodes is Photohabdus luminescens, in the Sc’s is the bacterium strain Xenorhabdus nematophilus, in the Sf’s the bacterium is X. bovienii. All types poison the host’s blood (called septicemia), thus killing it. The nematodes don’t actually do the killing, they just make it all possible and we all reap the benefits (except the old grub that is).


  • Please note - there may be several days delay before these insects are shipped because it can take a few days to wrangle up the healthiest possible specimens. When they are shipped, they will be shipped overnight to minimize deaths in transit. The shipping label will show that they were sent as quickly as possible.

    Frequently Asked Questions (FAQ):

  • Question: How much area coverage (sq. ft. or acreage) does each single order cover?

    Answer: Up to 12,000 sq ft, single use application.

  • Question: How many applications (say, over the course of spring and summer) are typically needed to clear up a substantial infestation of grubs?

    Answer: For severe infestation you may need 2-3 applications in the spring, then 1-2 at the end of the summer, repeat annually. That said it varies a lot based on how bad, influx of adults, breeding areas, external pressure, and other inputs (i.e. milky spore).

  • Question: How large is the shipping/storage container? (In other words, how much of my refrigerator will be consumed with storage of the product?)

    Answer: Product size is smaller than a paperback book, and actually arrives in a box with the content in a bag

  • Question: Are nematodes harmed by applications of milky spore?

    Answer: Nope. Milky spore and nematodes get along just fine.

  • Question: I have heard that nematodes also are effective against ticks, is this true?

    Answer: I would guess that nematodes are NOT helpful against ticks... I never heard that, and biologically it seems impossible. Bummer, I know. That'd be great if it were true.

  • Question: Are grubs likely to be found in wooded areas adjacent to lawns, and if so is the treatment regimen the same as for lawns?

    Answer: Not likely, turf roots are good eats, whereas that may not be the case in wooded areas. That said, it's not impossible, do a little digging (literally) and you should find them if they are there.

    HOW TO STORE, APPLY, ETC

    Use- Easy! Suspend contents of a zip lock bag in 1-5 gal. clean cold water. Allow to soak 15 minutes. Mix well. Sieve if necessary. Agitate during spraying. Use coarse spray. Remove screens. Contains the same high quality Steinernema feltiae AU (active units; infective juveniles), but easier to spray in pressure or injector sprayers.

    Storage - The 5 million active unit (AU) sizes stores for 1 month in a refrigerator, 38F (4C) After opening use entire bag. AU’s may be unevenly distributed; may dry and die after opening.

    Treat these pests with SCANMASK – Prewater area to treat. Water in after application.

    Fungus gnats SCANMASK kills Sciarid larvae in containers @ 19,000 AU/ sq.ft. of surface area. Spray on the soil surface with watering. A 4" pot requires about 1,650 AU. A 1 million pack treats 52 sq.ft. or of affected area, about 602 4” pots. Double dosage for heavy infestation and consider pyrethrin spray to knock down adults. Expect fewer adults emerging within two weeks.

    Cutworms are controlled by 19,000 AU/ sq.ft., but keep moist to allow SCANMASK activity at the surface until the insects are killed. A 1 million pack treats 52 sq.ft. of affected area. Sod webworms are controlled by 19,000 AU/ sq.ft. As with cutworms, keep moist. 1 million pack treats 52 sq.ft. of affected area. Use the same application rate for white grubs, Black vine weevils require about 35,000AU/sq.ft. of drip zone around shrubs.

    A 9" pot requires about 15,463 AU. Applications are injected into soils with a fertilizer probe or mixed with potting soil. A 1 million pack treats 28 sq.ft. of affected area, 64 9”pots.

    Root maggots Apply 13,000AU/transplant for cole crops and root plants before planting. For severe infestations, topdress after a few days treat with an additional 13,000AU/plant in a drench. A 1 million pack treats 76 sq.ft. of affected area.

    Apply 19,000 AU /sq.ft. to control white grubs. SCANMASK is sprayed on premoistened lawns. Then water in. For established bushes and trees inject a water suspension of SCANMASK. 1 million treats 52 sq.ft. of grubby area.
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    Nematodes (Heterorhabditis bacteriophora nematodes)