Honeylocust trees in the Wichita area are browning due to mimosa webworm. Damage is caused by the larvae, which mat leaves together with webbing and use them as a nest. These nests are normally found on the tips of branches and appear as brown areas from a distance. Closer inspection reveals the white webbing. Mature larvae are 0.5 inches long, light green to dark brown and sport five longitudinal white stripes.
The adults are silvery gray moths with small black spots on the wings. Mimosa webworm can severely defoliate trees. However, if the damage occurs late (such as now), healthy trees are not significantly harmed. Also, it’s late enough in the season that spraying will not help the trees. If mimosa webworm is a yearly problem on your honeylocusts, apply an insecticide such as BT
(Dipel or Thuricide) or spinosad. Spinosad is found in Natural Guard Spinosad, Captain Jack's Deadbug Brew, Bonide Colorado Potato Beetle Beater and Monterey Garden Insect Spray. Both of these products are organic controls. Traditional controls that contain cyfluthrin or bifenthrin are also effective. However, any of these products must be applied earlier in the year when you first notice webbing. (Ward Upham)
The adults are silvery gray moths with small black spots on the wings. Mimosa webworm can severely defoliate trees. However, if the damage occurs late (such as now), healthy trees are not significantly harmed. Also, it’s late enough in the season that spraying will not help the trees. If mimosa webworm is a yearly problem on your honeylocusts, apply an insecticide such as BT
(Dipel or Thuricide) or spinosad. Spinosad is found in Natural Guard Spinosad, Captain Jack's Deadbug Brew, Bonide Colorado Potato Beetle Beater and Monterey Garden Insect Spray. Both of these products are organic controls. Traditional controls that contain cyfluthrin or bifenthrin are also effective. However, any of these products must be applied earlier in the year when you first notice webbing. (Ward Upham)
RSS Feed
