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Q.Are Different Beneficial Nematodes Required For Killing Different Pests?

Zone Ashland, OR - zone 8? 2000 ft elev, 25" rain/yr, mostly in winter; hot dry summers; some freezes | Anonymous added on April 7, 2021 | Answered

My biggest problem is earwigs, a huge infestation, way too much for putting out dishes of liquid to trap them. But we also have at times problems with cutworms and aphids. Which nematodes are best for earwigs? Is it best to use more than one kind for earwigs major infestation? Are there some that are very effective for earwigs as well as for cutworms and aphids, or maybe we should first address the worst problem — the earwigs — and then do more localized, limited applications for the other two where they seem to cause problems.

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Certified GKH Gardening Expert
Answered on April 8, 2021

Beneficial nematodes attack a wide range of host insects that are soil borne such as grubs, cutworms, beetles, and fungus gnats. They do not work on pests in the leaf canopy such as aphids. To work on earwigs, you have to catch them in the larval stage.

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