By Jessica Jensen, K-State Research and Extension news service


Manhattan, KS— Homeowners looking out into a nicely landscaped yard may wonder whether now is the time to spray for bagworms. The answer is yes.


“Bagworms overwinter as eggs and young larvae usually hatch and emerge during mid- to late- May,” said Ward Upham, Kansas State University horticulture expert.


Bagworms are commonly found in shrubs, cedar, pine and spruce trees to name a few. Many people will begin to see damage during late-July to early-August, but controlling bagworms that are that size can be difficult. “They are much easier to kill while small,” Upham said.


“Now would be a good time to use control measures (because) earlier sprays may miss those who emerge from the bag later than normal,” Upham said.


Before spraying, homeowners should check for miniature versions of the mature bagworms and make sure they are alive because predators and parasites can potentially control this pest.


Upham lists the most common insecticides and brand names used for bagworms:





“Thorough spray coverage of foliage is essential for good control with any of these products,” Upham said.


Upham and his colleagues in K-State’s Department of Horticulture and Natural Resources produce a weekly Horticulture Newsletter with tips for maintaining home landscapes. The newsletter is available to view online or can be delivered by email each week.


Interested persons can also send their garden- and yard-related questions to Upham at, or contact your local K-State Research and Extension office.


Product names used in this article are for identification purposes only, and not intended to be an endorsement or criticism of any specific product.