Plant Bugs (Tarnished)
Lygus lineolaris
Sap-Sucking Insects Moderate Risk 5-6 mm
📖 Description
Tarnished plant bugs are among the most common and economically damaging plant bugs in North America. They feed on over 300 plant species, attacking buds, flowers, and developing fruit. Their toxic saliva kills cells at the feeding site, causing characteristic deformities known as cat-facing on strawberries and tomatoes. The damage is often mistaken for disease, but the distinctive pattern of deformed, scarred fruit with feeding punctures is diagnostic. Adults are strong fliers and readily move between wild host plants and cultivated crops.
⚠️ Symptoms to watch for
- Cat-facing deformities on fruits like strawberries and tomatoes
- Dark-colored feeding punctures on buds and young fruit
- Bud drop and failed flower development
- Stunted or deformed new growth
- Small dark spots on leaves where feeding occurred
- Sunken
- discolored areas on mature fruit
🩹 Treatment
- Hand-pick adults and nymphs from plants (organic)
- Use white sticky traps to monitor and capture adults (organic)
- Apply insecticidal soap to nymphs (organic)
- Keep weeds controlled to reduce habitat (organic)
- Apply permethrin or cyfluthrin spray (chemical)
- Use systemic acephate for persistent infestations (chemical)
🌿 Organic treatments
- Hand-pick adults and nymphs from plants
- Use white sticky traps to monitor and capture adults
- Apply insecticidal soap to nymphs
- Keep weeds controlled to reduce habitat
🧪 Chemical treatments
- Apply permethrin or cyfluthrin spray
- Use systemic acephate for persistent infestations
🛡️ Prevention
- Remove weeds and plant debris near crops in fall
- Use floating row covers during critical growth periods
- Avoid planting susceptible crops near weedy areas
- Till garden soil in fall to expose overwintering adults
- Plant early-maturing varieties to escape peak damage periods
🪴 Affected plants
- Strawberries
- Tomatoes
- Peppers
- Beans
- Cotton
- Fruit Trees
- Alfalfa
- Carrots
🦋 Natural predators
- Spiders
- Assassin Bugs
- Damsel Bugs
🌱 Host plants
- Fragaria spp.
- Malus domestica
- Pyrus communis
🔄 Lifecycle
- Adults overwinter in leaf litter and plant debris.
- They emerge in early spring and feed on buds of fruit trees and early crops.
- Females lay 30-100 eggs by inserting them into plant tissue.
- Eggs hatch in 7-10 days.
- Nymphs develop through 5 instars over 3-4 weeks.
- Adults live 3-4 weeks.
- There are 2-3 generations per year, with peak damage from the first generation in spring.
📅 Season
- Spring to Fall (peak damage in spring and early summer)
🔎 Appearance
- Small, oval, flattened bugs with distinctive tri-colored pattern: greenish-brown body with yellow and dark brown markings.
- They have a characteristic yellow triangle or 'V' shape on the back behind the head.
- Active and quick to fly when disturbed.
💥 Damage level
- Moderate
🔁 Reproduction rate
- Moderate
🗺️ Geographic regions
- North America
- Europe
- Asia
Have an Insect to Identify?
Upload or take a photo of an insect on your plant and our AI will identify it and recommend treatments.
📷 Diagnose from Image