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Honeylocust Plant Bug Diagnostic Guide

Diaphnocoris chlorionis

Honeylocust plant bug, Diaphnocoris chlorionis, causes damage when the insect’s mouthparts penetrate the leaf cells and injects a toxic saliva while feeding. This toxic saliva, which helps with the uptake of plant cell contents and digestion, kills cells around the feeding site causing browning, leaf rolling, distortion, and chlorosis. Damage can weaken the tree, causing it to be more susceptible to attack by secondary insects and diseases. After the plant bugs are gone, the damaged leaves will remain on the plant for the rest of the season.

Honeylocust

Honeylocust

Signs of Damage

  • Yellowish-white leaf stippling on upper surfaces that eventually turns brown.
  • Leaf distortion and chlorosis.
  • Chlorotic spots turn brown, and the entire leaf dries and drops.
  • Severe infestations may lead to complete defoliation, but death rarely occurs.
Honeylocust Plant Bug Signs

Whitney Cranshaw, Colorado State University, Bugwood.org

Physical Appearance

  • Adults are pale green and about 3/16 inch long with four segmented antennae and a beak-shaped mouthpart.
  • The nymph looks just like the adult, but smaller.
  • Both adults and nymphs are very active and can be seen flying when tree branches are disturbed.
  • Eggs are light in color and nearly 1/8 inch in length.
Honeylocust Plant Bug Signs

Whitney Cranshaw, Colorado State University, Bugwood.org

Honeylocust Plant Bug Signs

Oregon State Uni. Bugwood.org

Biology

  • Just after bud break in early spring, young nymphs crawl into unfolding leaves and begin feeding.
  • Nymphs feed for 3-4 weeks before maturing.
  • Adults mate and lay eggs.
  • Eggs overwinter by becoming embedded in the bark.

Treatment Strategy

In early spring, newly emerging leaves should be examined for active nymphs, stippling, and distortion symptoms prior to treatment. If nymphs are present, insecticides should target young nymphs 7 to 10 days after bud break. If using contact sprays, be sure to cover the foliage and bark completely.

  • Soil Application using Xytect 2F

    Dosage: 6mL/inch DBH
    Timing: Late summer to early fall for next year protection
    Re-Treatment: Annually
    Xytect 2F
    Xytect 2F
    $69.60
  • Soil Application using Transtect

    Dosage: 1 packet/5-17 inches DBH
    Timing: Early spring
    Re-Treatment: Annually
    Transtect
    Transtect
    $326.00
  • Soil Application using Xytect 75WSP 22 packets

    Dosage: 1 packet/24- 48 inches DBH
    Timing: Late Summer to early fall for next year protection
    Re-Treatment: Annually
    Xytect 75WSP 22 packets
    Xytect 75WSP 22 packets
    $148.00
  • Soil Application using Transtect

    Dosage: 1 packet/5-17 inches DBH
    Timing: Early spring
    Re-Treatment: Annually
    Transtect
    Transtect
    $326.00
  • Systemic Bark Spray using Transtect

    Dosage: 6 packets/gallon water (1.5-2.0 oz./inch DBH) for trees < 24 inches DBH. 6-12 packers water (1.5-2.0 oz./inch DBH) for trees > 24 inches DBH.
    Timing: Early spring, can also be used as a ‘rescue’ treatment
    Re-Treatment: Annually
    Transtect
    Transtect
    $326.00
  • Soil Application using Lepitect

    Dosage: 1 packer/25-50 inches DBH
    Timing: Apply 1-3 weeks before insect feeding.
    Re-Treatment: Repeat application 30 days
    Lepitect
    Lepitect
    $59.20
  • Foliar Spray using Up-Star Gold

    Dosage: 21.7 oz/100 gallons water
    Timing: Apply 7-10 days after honeylocust leaves begin emerging and into early May (58-246 GDD)
    Re-Treatment: Repeat applications as needed every 14-21 days.
    Up-Star Gold
    Up-Star Gold
    $33.33
  • Tree Injection using Xytect 10%

    Dosage: 1 ml/ inch DBH for trees 2 to 10 inches DBH
    Timing: Early spring –ideally 1-3 weeks before pests are actively feeding
    Re-Treatment: Annually
    Xytect 10%
    Xytect 10%
    $453.96
  • Tree Injection using Xytect 10%

    Dosage: 1.5 ml/inch DBH for trees 10 to 36 inches DBH
    Timing: Early spring –ideally 1-3 weeks before pests are actively feeding
    Re-Treatment: Annually
    Xytect 10%
    Xytect 10%
    $453.96
  • Tree Injection using Xytect 10%

    Dosage: 2 ml/inch DBH for trees 36 inches DBH and above
    Timing: Early spring –ideally 1-3 weeks before pests are actively feeding
    Re-Treatment: Annually
    Xytect 10%
    Xytect 10%
    $453.96
  • Tree Injection using Xytect 10%

    Dosage: For heavier infestation and/or more resistant insects, use 1.5 ml or 2 ml rates on trees having a DBH of 2 inches and above.
    Timing: Early spring –ideally 1-3 weeks before pests are actively feeding
    Re-Treatment: Annually
    Xytect 10%
    Xytect 10%
    $453.96

Treatment Expectations

Treat with Xytect™ in late summer/fall for plant bugs. These insects are active early in the spring of the year. A spring soil treatment with Xytect™ will miss the window of opportunity for same-season control. Xytect™ treatments will also control honeylocust pod gall midge.

A Diagnostic Guide is designed to help you identify a pest issue and management solutions. Always refer to product label for all rates and approved uses. Some images courtesy forestryimages.org. Use of the images does not imply endorsement of treatments by forestryimages.org

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