07.24.20
corn rootworm beetle COUNTS
Week two of trapping is complete, with round three coming this Friday. Northern Dane County it still racking up some high numbers - so field experiencing some much silk clipping an insecticide application was required. As corn starts to reach brown silk, expect beetle counts to continue to drop. In fact, this week may have been our peak already. If pollination is less than 50% complete and silks are pruned back to less than 1/2 of an inch - consider spraying your fields ASAP!
Please call if you have any questions! - Jason (920) 382-5465
08.23.19
corn rootworm beetle COUNTS
Week 3 of corn rootworm beetle counts were variable based on location. Most counts dropped or remained at zero. However, a few locations actually increased. Beetles can move from field to field
Please call if you have any questions! - Jason (920) 382-5465
08.16.19
corn rootworm beetle COUNTS
Week 3 of corn rootworm beetle counts were variable based on location. Most counts dropped or remained at zero. However, a few locations actually increased. Beetles can move from field to field
Please call if you have any questions! - Jason (920) 382-5465
08.09.19
corn rootworm beetle COUNTS
Peak beetle counts have dropped across most of our area as we enter the tail end of pollination. We have observed significant silk clipping in fields with heavy beetle pressure - especially when coupled with the high number of Japanese Beetles we have seen this year. Keep an eye out for them as well, as not only will they clip silks, but will burrow in the top of the ear and feed on kernels. This can cause yield damage and open the ear up to other pathogens.
If you are seeing a fair amount of corn rootworm beetles in your field, it has been corn for several years, and it is going to be corn again this year - you may need to consider a spray application to prevent excessive pressure in 2020. We will discussing 2020 and beyond corn rootworm management strategies in our up coming field days!
Please call if you have any questions! - Jason (920) 382-5465
08.02.19
corn rootworm beetle COUNTS
We placed corn rootworm sticky traps in all of the fields we have WBC pheromone traps in this year to monitor beetle pressure. Unlike, WBC that have moths that fly in annually - corn rootworm lay eggs in fields and hatch and feed on corn roots the following season. Beetles then emerge from the soil and feed on corn silks and pollen, before they laying eggs again in the fall. Rotation and trait selection are going to be the most important factors for knowing how much pressure a field might have. Most of our counts below that are 12 or higher were long-term continuous corn on corn. In addition to feeding on roots, CRW can feed on silks and inhibit pollination. Treat corn fields if silks are clipped to 1/2-inch or less from the ear and pollination is less than 50% complete. This usually requires approximately 5 beetles per plant. Most fields are at or past this stage - but beetle bombing and controlling larva for next year may be needed.
Please call if you have any questions! - Jason (920) 382-5465
