Honeylocust plant bug

Honeylocust plant bug, Blepharidopterus (Diaphnocoris) chlorionis, is a relatively new pest in Oregon. It's presence in Oregon was confirmed in 2008. It has likely escaped detection for several years due to the cryptic coloration of the nymphs and adults which allow them to blend into the green of the foliage and stems. At this time they have been found in landscape settings. They may become a pest in nursery production but current management of honeylocust pod gall midge may also be managing this new pest.

There is one generation of this insect which overwinters as eggs. Activity begins with bud expansion of honeylocust when the nymphs hatch (eclose) and begin to feed on new growth. This feeding can cause stippling and growth distortion. Adults can be found about a month after nymphs appear and they also feed on new growth.

Damage
Heavy feeding can cause defioliation and in severe cases, can cause defoliation. Research by Herms et. al. found that defoliation was consistently highest on the cultivated variety, 'Moraine'. Older landscape trees often handle the feeding damage with only cosmetic damage. Younger nursery stock may show the distorted leaflet damage for much of the season.

Chemical control timing is focused on the newly expanding buds. Nymphs in the early season can be dislodged with high pressure water sprays. Horticultural oils and insecticidal soap are also used against the young nymphs. For additional chemical control information, check the Chemical Control of Nursery Pests section of the PNW Insect Management Handbook.

Web resources:

Penn State Cooperative Extension Entomological Notes: Honeylocust plant bug

Kyle, J. and J. Hahn. Ash and Honeylocust plant bug. University of Minnesota Pests of Trees and Shrubs. <26 April 2016>

References:

Herms et al. 1987. Impact of Honeylocust Plant Bug (Heteroptera: Miridae) on Ornamental Honeylocust and Associated Adult Buprestids. Environmental Entomology, Volume 16, Number 4, August 1987 , pp. 996-1000(5).

 

Orginal publication: 7-1-2008
Latest update: 4-26-2016

Author: R.L. Rosetta, Extension Nursery Integrated Pest Management, Department of Horticulture, Oregon State University

Honeylocust plant bug adult

Honeylocust plant bug adult

Honeylocust plant bug damage

Honeylocust plant bug damage

Honeylocust plant bug damage

Honeylocust plant bug damage

Honeylocust plant bug adult

Honeylocust plant bug adult

Honeylocust plant bug nymph

Honeylocust plant bug nymph