Elm seed bugs, relatively new to Idaho since establishing near Boise in 2009, have been found throughout the state wherever elm trees grow. These insects, smaller than box elder bugs, are about 1/3 inch long with a dark, rusty-red and black coloration. Adults have a distinct upside-down black triangle on their back. Elm seed bugs are known for their busy habit of running around more than their cousins, the box elder bugs. During periods of extremely high temperatures, they may migrate indoors to seek cooler climates, emitting a foul odor when aggravated.
Although these bugs cause little damage to overall tree health, they can become a nuisance by congregating in large numbers on tree trunks, the ground, and nearby structures. As fall approaches, they start seeking overwintering habitats, often invading homes through cracks and crevices, windows, and doors with poor seals. Homeowners are advised to bug-proof their homes by weather-stripping doors, caulking around windows, and repairing torn screens.
To control infestations, products containing active ingredients like beta-cyfluthrin and permethrin can be used. It’s important to only use products labeled for the intended application site. Residents are encouraged to rake and destroy elm seeds to reduce nymph food sources and to physically remove bugs using a shop vacuum. If an infestation is suspected, taking proactive measures to prevent entry into homes can help mitigate the problem.
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