Ash Plant Bug

Tropidosteptes amoenus

The ash plant bugTropidosteptes amoenus, is found throughout the United States on ash and may occasionally feed on nearby plants if ash becomes heavily infested and defoliated. Plant bugs generally do not seriously injure vigorously growing trees, although they can detract from their appearance. Young, recently transplanted, and stressed trees are most likely to be damaged.

Download Ash Plant Bug Fact Sheet

Treatment Strategy

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

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Ash 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. Transtect™ should be applied in the spring to control first and second generation ash plant bug feeding.

Application Type – Soil drench

DIY Product/Equipment Needed:

•  Transtect

•  Measuring or diameter tape

• Soil drench kit

•  Bucket or watering can

Ash Plant Bug Treatment Option 2

Optrol™ is applied to the soil and has a long residual (1 year), however it usually will take 30 – 60 days for the product to reach the leaves. Professional arborists often apply Optrol™ in the fall of the year for control over the whole next season. Early spring application is also very effective.

Application Type – Soil drench

DIY Product/Equipment Needed:

Optrol™

•  Measuring or diameter tape

• Soil drench kit

•  Bucket or watering can

NOTE: Our Soil Drench Kit with Optrol Quart is a great choice for this option.

Ash 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 drift and contact with beneficial insects. They are, however, still used on smaller plants that can be easily treated with a hand sprayer. These products typically have a residual of 10 – 14 days, so begin applications once ash plant bug symptoms appear in the spring. Follow up sprays are often needed to control second generation plant bugs.

Application Type – Foliar spray

DIY Product/Equipment Needed:

•  Up-Star Gold

•  Hand pump sprayer with wand

•  Gloves

•  Safety glasses

Ash Plant Bug DIY Kit

For Ash Plant Bug Treatment Option 1

Application Type – Soil drench

DIY Product/Equipment Needed:

•  Transtect

•  Measuring or diameter tape

• Soil drench kit

•  Bucket or watering can


For Ash Plant Bug Treatment Option 2

Application Type – Soil drench

DIY Product/Equipment Needed:

Optrol™

•  Measuring or diameter tape

• Soil drench kit

•  Bucket or watering can


For Ash Plant Bug Treatment Option 3

Application Type – Foliar spray 

DIY Product/Equipment Needed:

•  Up-Star Gold

•  Hand pump sprayer with wand

•  Gloves

•  Safety glasses

How Is It Spread?

• Ash plant bug eggs overwinter on twigs and branches

• Eggs hatch at bud break in the spring

• First generation bugs feed for three to four weeks

• They mate and lay eggs that hatch in seven to ten days

• Second generation ash plant bugs feed from July through August

• Eggs laid in July and August hatch the following spring

Susceptible Trees

Ash trees, such as American mountain ash and green ash trees.

Symptoms

• Yellowish white spots “stippling” on leaves

• Large brown areas on leaves

• Leaf drop and deformation of leaves

• Small black spots on the bottom side of the leaf

• Active black and red nymphs in May and July

Lookalikes

Aphids

Related/Similar Problems

Aphids

Timing

Spring or Fall

Urgency

Moderate

Risk of Spreading

Moderate

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