Lacebugs on Elm Trees
Our Elm trees (3) were treated for Lacebugs on 8/11/17. The tree care company used a soil injection insecticide. My question is whether we will need to re-treat the trees again this Spring or Summer? Or, after the treatment, what is the likelihood they will return this summer? Thank you for your help. PK
Harris County Texas
It depends on several factors.
1) What insecticide was used and how long it remains active in the plant.
2) The growing conditions will also affect the population. With the freeze we had in January, the bugs that were overwintering around the tree may have been negatively affected (which is what you want).
3) Monitor the trees late spring/early summer to see if there are any signs of damage. No two seasons are the same from year to year.
Here are some additional resources. https://www.extension.umn.edu/garden/insects/find/lace-bugs-on-minnesota-trees-and-shrubs/ https://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG95%20La...
Thanks for the question.