New Invasive Bug Species Found In Michigan

LANSING, MI — Michigan is one of three states where an invasive moth species has been discovered this year, according to state science officials.

Box tree moths have been identified in nurseries and greenhouses across the U.S., including Michigan, Connecticut and South Carolina, the U.S. Department of Agriculture recently reported. Michigan was the first state the invasive species was detected in, according to the Michigan Department of Agriculture and Rural Development.

"Boxwoods are commonly planted in North America as ornamentals with the largest plantings occurring in urban areas," said Robin Rosenbaum, Plant Health Section Manager of MDARD's Pesticide and Plant Pest Management Division. "In 2014, boxwood made up 15 percent of broadleaf evergreen sales in the United States with an estimated value of $126 million. Ensuring this pest is quickly contained is crucial to protecting the state's boxwood."

While the box tree moth is not considered a forest pest because boxwood isn't native to Michigan forests, officials are concerned because the species could cause significant defoliation and death of boxwood in the landscape if left unchecked.

State officials are advising people who have purchased boxwood plants within the last two months to inspect their plants closely for the invasive species. Signs of infestation include silky webbing and possibly caterpillars located deep inside the plants.

Box tree moth caterpillars are green and yellow with white, yellow and black stripes and black spots. The caterpillars feed only on boxwoods.

Anyone who sees signs of box tree activity can contact MDARD's nursery program at MDARD-NurseryCE@michigan.gov.