Home Farm Equipment Sap beetles in corn grain?!

Sap beetles in corn grain?!

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I’ve yet one more bizarre insect state of affairs so as to add to what seems like an already complete record of points for 2021. Final week, a farmer in central Iowa introduced a grain pattern into an ISU county extension workplace that was filled with small, black beetles. These beetles had survived by way of the mix and had been nonetheless current when he transferred the grain to a grain dryer.

Chelsea Llewellyn.

Sap beetles collected from a pattern of grain.

Entomologists on campus have recognized this pattern as sap beetles (Carpophilus genus), a comparatively widespread pest discovered in subject corn, candy corn, and different crops. The commonest species to see round Iowa proper now’s fourspotted sap beetle. Most frequently, the beetles are secondary pests in corn, feeding on injured kernels on the tip. My normal commentary this summer season was that sap beetle populations appeared very excessive in each candy corn and subject corn.

Joyce Gross, UC Barkeley10-04-21 #2 sap_beetle_joyce_gross_uc_berkeley-400x267.jpeg

Fourspotted sap beetle.

Whereas we additionally don’t usually consider these bugs as saved grain pests, it’s potential that they might infest saved merchandise like saved grain in grain bins. On this farmer’s case, a small proportion of beetles survived after his low temperature (

Little or no info appears to exist concerning administration of sap beetles as a saved grain pest in corn. Edmond Bonjour, an Oklahoma State College extension entomologist and famous knowledgeable on pests of saved grain merchandise, referred me to 2 paperwork out there on the web, a resource from Purdue on the biology of sap beetles and a resource from North Carolina State University that gives some sensible administration recommendation for sap beetles in subject corn. The NC State publication notes that farmers can change mix settings to try to blow extra of the beetles and damaged kernels out of the mix however that insecticide remedy could also be crucial earlier than storing the grain in the bin.

We hope this was a one-off occasion for this explicit farmer and that it’s going to not be a extra widespread difficulty this fall as corn harvest continues. Moreover, as temperatures cool, we hope sap beetles will transfer from corn ears to extra protected areas to overwinter and get rid of concern for the pest making a house in any extra saved corn grain. Please attain out when you suppose you’re seeing sap beetles in corn grain and would love assist with identification or administration.

Supply: Iowa State College which is solely accountable for the knowledge supplied and is wholly owned by the supply. Informa Enterprise Media and all its subsidiaries are usually not accountable for any of the content material contained in this info asset. 

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