Knowledgebase

Red and black insects #800010

Asked July 08, 2022, 8:54 AM EDT

Can you help me identify these red and black insects that are everywhere in my vegetable garden? Are they beneficial or harmful? Thank you

St. Clair County Michigan

Expert Response

Hello Angela,

That is a boxelder bug nymph, Leptocoris trivittatus (Hemiptera: Rhopalidae).

Boxelder bugs nymphs are bright red in color and are quite nomadic this time of year. During the summer they feed on the flowers and seedpods of female boxelder trees and to a lesser degree on silver maple and other trees and shrubs.

Boxelder bugs invade our homes and other structures in the fall of the year looking for dry, protected sites in which to spend the winter. It is not necessary to control boxelder bug nymphs this early in the summer to keep them from invading homes in the fall. These are just the first generation nymphs. They will mature into adults and lay eggs in July. These eggs develop into the second generation adults that invade our homes in October.

Their numbers can be temporary reduced by spraying a persistent insecticide in areas where the nymphs are seen in high numbers. Products such as permethrin (sold under a variety of brand names), cyfluthrin (sold as Bayer Advanced Vegetable and Garden Spray) or bifenthrin (sold as Ortho Bug-B-Gon or Home Defense Max) can be used to reduce their numbers. Be sure to read and follow all directions on the pesticide label. Spraying the outsides of homes will, no doubt, involve spraying above one’s head. Be sure to wear protective clothing such as a wide-brimmed hat and raincoat. Eye goggles are a must.

Regards,

Howard

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Howard Russell, Entomologist Replied July 08, 2022, 1:57 PM EDT
Hello Howard,
Thank you for your quick and helpful response. My vegetable garden is organic, are there any alternatives to insecticide that would help get rid of them? 
Thank you, 


Angela
On Fri, Jul 8, 2022 at 1:57 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied July 08, 2022, 3:46 PM EDT

Hi Angela,

There is no need to get rid of them in your garden.  They are just roaming around and only feed on boxelder trees.


Howard

Howard Russell, Entomologist Replied July 08, 2022, 5:27 PM EDT
Thank you for your help!

On Fri, Jul 8, 2022 at 5:27 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied July 08, 2022, 5:41 PM EDT

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