Friend or foe?

Asked June 5, 2019, 9:21 AM EDT

Can you tell what I'm dealing with here? I saw some green beetles on a horseradish plant by my grapes and now I think the larvae are eating my grape leaves. Is there a non chemical solution for my 3 vines?

Wayne County Michigan

3 Responses

Hello,

Beetle larvae typically look like grubs and live in the soil, or sometimes inside stems of plants. The pictures are a little blurry on my screen but, these appear to be caterpillars. Caterpillars are the immature form of moths and butterflies.

Caterpillars on edible plants can be controlled by knocking them off into soapy water, then discarding the water after they have been killed. Bt sprays are effective against caterpillars-

http://www.entomology.wisc.edu/mbcn/fea207.html

You can use any insecticide labeled as safe for use on grapes. Please read the label and be sure the product is safe to use on edibles-https://pender.ces.ncsu.edu/2013/09/controlling-caterpillars-in-vegetable-gardens/

For a fee, MSU Plant and Pest Diagnostic lab can identify fresh whole insect samples packaged in white vinegar in a water-tight vial or small jar. See their website for details- https://pestid.msu.edu

Or, if you can get a clear closeup of a couple, perhaps on a plain sheet of paper, I can refer this to an entomologist.

I hope this has been helpful. Thanks for using our service.


Thanks Laura.