Knowledgebase

possible crane fly larvae problem??? #924160

Asked February 02, 2026, 8:21 PM EST

I'm starting a native plant meadow in my front yard. This fall and early winter there were starts of Roemer's fescue (seeded from more mature plants) and California poppies coming up all over. Now they have all disappeared . Could this be crane fly larvae predation? There are crane flies present in the summer in this location. I am not interested in using pesticides. Would diatomaceous earth be an alternative? What else could be eating these tiny starts? Thanks for your help!

Lane County Oregon

Expert Response

Joyce

Crain flies do not damage plants in this manner. They require a very moist environment to work in and survive in. Other potential pests include grasshoppers, rodents, and rabbits.

I have a few questions for you that will help me pinpoint who is causing the damage.

  • Are the plant/seedling completely consumed or are there still parts of plants left?
  • Do you or have you seen any slime trails?
  • What other plants are close by, and have you found any damage to them?
  • How long has this plant damage been occurring?

Let me know if you have any additional questions. Thank you for contacting us at Ask Extension. Rich

An Ask Extension Expert Replied February 06, 2026, 12:07 PM EST
Hi Rich,

I found the tiny fescue and poppy sprouts in the third week of October. They persisted through November at least, I’m thinking maybe at least several weeks longer. Then I stopped checking on them until last week. 

The fescue and poppies were completely gone. Nearby, the new growth on several established achillea is also eaten. When I transplanted very small achillea starts last late winter/early spring some of those were completely eaten. Nearby older CA poppies from last summer are untouched. 

In this area, there are always many shallow holes scraped in the arborist wood chip mulch by some unseen critters foraging for ???

I do occasionally see slime trails but I’ve baited many times last year (beer, yeast, commercial pellets) I routinely caught one or (mostly) no slugs and the damage continued on the achillea.

Thank you so much for your time and help,
Joyce



On Feb 6, 2026, at 9:07 AM, Ask Extension wrote:

The Question Asker Replied February 07, 2026, 7:50 PM EST

Joyce

  • Crane flies need moist environments, damp soil, and decaying organic matter where their larvae live and feed, adults seek mates in grassy areas.
  • The larvae live in soil and feed on roots, thriving in wet conditions like irrigated lawns.

Your answers were most helpful. One thing your answers confirmed to me was that Crane Flies are not the cause of the plant damage. Whatever is chewing up the plants has ‘chewing mouth parts such as Grass hoppers, caterpillar, small rodents. These are the more likely pest eating your plants.

I have a suggestion for you that may catch who is eating your plants. Not sure you will catch anything this ‘winter’ period but if you put out pans like you to cook brownies in and fill them about half way with soapy water the pest may fall in the water and drown. You will have your pest.

Let me know if you have any additional questions. Thank you for contacting us at Ask Extension. Rich

An Ask Extension Expert Replied February 08, 2026, 1:40 PM EST
Thank you Rich!

On Feb 8, 2026, at 10:40 AM, Ask Extension wrote:

The Question Asker Replied February 08, 2026, 7:20 PM EST

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