Wireworms, the larva of the Click beetle, can be serious pests and there is not much about control acceptable to organic gardeners other than soil solarization. The larva will be in the soil for two years, pupating the third year so it is not a good idea to plant susceptible crops where they are known to be present. Cultivation of the soil several times before planting has, sometimes, reduced populaitons of those larva.

Thanks, but I'm looking for ways to kill them off, even if I have to go non-organic. I would make this exception as I *know* they can be in the soil for years and I know not to plant susceptible crops there but I can't do that for years as my space is limited. I don't want to REDUCE their population, I want them all DEAD. I will ask in the non-organic forum, but would like more input from organic gardeners first.

Anyone else?

Beneficial Parasitic Nematodes.
They can be sprayed on the soil via a watering can, will then attack to larvae in the soil.
I have used them on my lawn, in the orchard and vegetable plot, works a treat.
No doubt there are USA suppliers.

Here is a link that might be useful: Canadian supplier

According to all of the information I've seen, the nematode results are spotty, at best. I'm not at all sure that I'd invest the money or time until better results are documented.

Champagne, you might want to check with your local extension office. I know that wire worms can be a real issue in the PNW, and I expect that they will have some up-to-date information.

Thank you everyone. I appreciate your thoughts and time!
Champagne

I found a handbook & have listed the link below:

Management - cultural and biological controls
Crop rotation is an important tool for wireworm control. Wireworms tend to increase rapidly among red and sweet clover and small grains (particularly barley and wheat). Birds feeding in recently plowed fields destroy many wireworms. However, in seriously infested fields this does not reduce the overall pest population below economic levels. To date, field tests of entomopathogenic nematodes in wireworm infested fields show they do not effectively control wireworms. There are no parasites or biological insecticides known to be effective in wireworm control, but research is ongoing in this area.

Management - chemical control: HOME USE
1. Organic oils such as clove oil, cinnamon and thyme oils.

Here is a link that might be useful: PNW Insect Management handbook page for Irish potatoes