(Diaphnocoris chlorionis) - Affecting
If your honeylocust trees look like these
on the left in June, don't feel bad. Most Cheyenne
honeylocust trees look like this every spring. The trees will
push out another set of leaves about a month later, as seen in
the photo on the right of same trees.
Photos: Cheyenne Urban Forestry
Damage on the leaves. Honeylocust plant bug
E. Bradford Walker Photo:
honeylocust plant bug is very small, half the size of a grain
of rice. The insect overwinters in the egg stage.
The eggs hatch at the time the trees break bud, (new leaf growth),
usually late April through early May. The feeding occurs
for about one month. At the end of May to early June, the
adults are present for two to three weeks. During this time
they mate and lay eggs for the next year's generation. There
is only one generation per year.
feeding of the honeylocust plant bug during spring leaf emergence
causes the tree to use limited food storage to develop a new set
of leaves, usually late June to early July. Spring defoliation
of the tree year-after-year severely weakens the tree, causing
limb die-back, sometimes to the point of tree death.
trees can be sprayed at bud-break, or soon after bud-break, to
help control the insect. OR Merit® a brand name systemic insecticide
containing Imidacloprid can be injected with water into the root
zone of the tree. The insecticide is taken up by the roots
and spreads throughout the tree, killing many types of insects
feeding on the tree. The honeylocust leafhopper, cottony
maple scale, and aphids
can also be controlled using an Imidacloprid product. An
application of Imidacloprid can be effective for a year or more.
It should be applied to the root zone while the tree is
in full leaf. An application in mid to late summer should
still be effective at bud-break the following spring. The
application of Imidacloprid should be left to commercial pesticide
State University Cooperative Extension
possible, take a couple of digital photos of your tree or shrub
and include them with your questions. One photo should be a close
up of the problem area. The second photo should be of the entire
tree if possible.