Honeylocust Plant Bug

Diaphnocoris chlorionis

Honey locust plant bug, Diaphnocoris chlorionis, is a common insect that infests locust trees. They injure the tree by feeding on the sap, which results in distorted and deformed leaves. Often the tree will appear very thin and its tiny leaflets will be shriveled.

Download Honeylocust Plant Bug Fact Sheet

Treatment Strategy

Repeated defoliation can reduce the energy reserves and make affected trees more susceptible to other insect and disease attacks. Soil-applied systemic insecticides such as Optrol ™ and Transtect™ are applied to the soil at the base of the tree and are taken up by the root system and work from the inside of the plant.  A contact insecticide such as Up-Star® Gold can be sprayed and is very effective as long as even coverage of the foliage is achieved.

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Honeylocust Plant Bug Treatment Option 1

Transtect is applied to the soil and will work quickly – usually in about 7 days. One treatment lasts the entire season, but should be applied just as leaves are emerging to control feeding nymphs.

Application Method – Soil drench

DIY Equipment/Product Needed:

• Transtect

• DBH tape or measuring tape

• Gloves

• Soil drench: Watering can, shovel or soil drench kit

 

Honeylocust Plant Bug Treatment Option 2

Optrol ™ is applied to the soil and has a long residual (1 year). However, it usually takes 30 – 60 days for the product to reach the leaves. Professional arborists often apply Optrol ™ in the fall of the year for control the entire next season. Application in the spring – just as buds are swelling – can also very effective.

Application Method – Soil drench

DIY Equipment/Product Needed:

 • Optrol ™

• DBH tape or measuring tape

• Gloves

• Soil drench: Watering can, shovel or soil drench kit

Honeylocust Plant Bug Treatment Option 3

Spray products such as Up-Star® Gold are not used very often anymore for larger trees as there are issues with wind drift and contact with beneficial insects. They are, however, still used on smaller plants that are easily treated with a hand sprayer. These products typically have a residual of 10 – 14 days, so applications should be done once leaves have fully emerged. Often a second application is necessary two weeks later to control any insects that remain.

Application Method – Foliar spray

DIY Equipment/Product Needed:

• Up-Star® Gold

• Pump up sprayer with wand

• Gloves

• Safety glasses

Honeylocust Plant Bug DIY Kit

Option 1

Application Method – Soil drench

DIY Equipment/Product Needed:

• Transtect

• DBH tape or measuring tape

• Gloves

• Soil drench: Watering can, shovel or soil drench kit

Option 2

Application Method – Soil drench

DIY Equipment/Product Needed:

 • Optrol ™

• DBH tape or measuring tape

• Gloves

• Soil drench: Watering can, shovel or soil drench kit

Option 3

Application Method – Foliar spray

DIY Equipment/Product Needed:

• Up-Star® Gold

• Pump up sprayer with wand

• Gloves

• Safety glasses

How Is It Spread?

• Eggs overwinter in twigs and branches.

• Eggs hatch shortly after the buds open in the spring.

• Nymphs feed for the next 3-4 weeks until they mature.

• Adults mate and lay eggs which will hatch next spring.

Susceptible Trees

All varieties of honeylocusts and black locusts are susceptible to honeylocust plant bug attacks.

Symptoms

• Yellowish-white leaf stippling on upper surfaces that eventually turns brown.

• Leaf rolling, distortion, and chlorosis.

• Thin canopy; often parts of the tree will look defoliated with heavier infestations.

Chlorotic spots turn brown, and entire leaf dries and drops.

• Severe infestations may lead to complete defoliation, but death rarely occurs.

Lookalikes

Honeyloucst spider mites

Related/Similar Problems

Honeylocust spider mite

Timing

Spring or Fall

Urgency

Low

Risk of Spreading

Low

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