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Tarnished Plant Bug

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Tarnished Plant Bug (TPB), Lygus lineolaris

Overview

  • TPB adults are 1/4 inch long, somewhat flattened and brown in color, with black, white, or yellow markings, including a clear-yellowish triangle on each wing tip.
  • Adults overwinter in protected areas within and around orchards. They are first active on warm early spring days and become abundant from green tip through petal fall. Adults feed by inserting their mouthparts into developing fruit buds. Orchards with an abundance of legumes or flowering plants in the ground cover often have high TPB populations.
  • TPB feeding up to tight cluster usually results in undeveloped buds that fail to set fruit. Buds damaged by feeding after tight cluster may survive but will be scarred. As the apple develops, damage often appears as deep, sunken areas, conical in shape, with associated light corky russetting, often confined to fruit calyx.

Monitoring

  • Suggested action threshold: 2 to 3 bleeding sites per 10-terminal sample.

Control

  • If needed apply insecticide tight cluster to pink bud stage. Insecticide choices include Beleaf, Avaunt, or a synthetic pyrethroid such as Warrior, Asana, Baythroid, Danitol, or Pounce. Use of a synthetic pyrethroid may lead to outbreak of European red mites since these insecticides are harmful to beneficial mites.