Posted by JD Seller on August 30, 2015 at 07:32:29 from (208.126.198.123):
In Reply to: Now she did it! posted by Eldon (WA) on August 29, 2015 at 18:50:26:
Eldon you are really limited in controlling the earworms if you can't use pesticides.
Some have stated that rotation will help it does but in your case your fields are too close for it to really help much. Example: If you switch the ground that is in corn to onions the grubs will still hatch into moths. These moths fly long distance ( this can be miles and they do ride the air currents as well so it can fifty to a hundred miles) to lay eggs in the silks of corn. So moving the field a few hundred feed does little for control.
There are natural BT funguses that are approved for organic production that can be sprayed. Also varieties of corn with real tight husk help. Like Traditional farmer posted a little vegetable oil on the silks will help control them as well.
You will have to have a earworm control plan now that they are in your soil. I do not think your ground will freeze hard enough to control them. They will be back next year in greater numbers. Before the BT corns came around they could be major pests in field corn when we had the "right" weather and air flows from the south. The moths can and do ride the air currents north. I am really surprised you have not had them for 6-7 years. Maybe your where lucky in that there was not major fields of corn around you close????? I usually plant my sweet corn in the outside few rows of a regular field corn field. They seem to not bother these rows as much as the ones in the middle of the field but in some years I will still have as high as 25% ear damage. Like some have posted we usually just cut the top of the ear off and are able to use the bottom. I know this is not an option for you selling corn.
Like I said you need to plan now for next year as there are a few things to do yet this fall like tillage to help control them. They are not like the corn bore in that earworms winter in the soil not the fodder. So tillage is only a small control agent.
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