A fluffy white, waxy substance will often develop on the bark and branches of apple trees,ornamental malus trees, pyracantha and cotoneaster in summer. Seen around old prune sites/splits in older bark in Spring. Later feeding on young branches causes soft, knobbly swollen galls. These galls are prone to splitting in frosty conditions - which may become susceptible to fungal diseases ie Apple Canker.
Product Solution: Early signs in spring spray with Provado Ultimate Bug Killer ready to use or Provado Ultimate Fruit and Vegetable Bug Killer Ready To Use/ Concentrate. Pruned sites could be treated with Arbrex Seal and Heal.