Light infestations are of little consequence, but heavy attacks are best dealt with in early to mid-summer when the more vulnerable newly-hatched scales are present.
- Spray ornamental plants with systemic insecticides thiacloprid (e.g. Provado Ultimate Bug Killer) or acetamiprid (Bug Clear Ultra). Contact insecticides such as deltamethrin (e.g. Bayer Provado Ultimate Fruit & Vegetable Bug Killer) or lambda-cyhalothrin (e.g. Westland Resolva Bug Killer). These pesticides can be used on some fruits affected by brown scale, including plum, raspberry and black currant, check the label before purchase.
- Other treatments for outdoor ornamental plants and fruit trees/bushes include plant oils/extracts (e.g. Vitax Organic 2 in 1 Pest and Disease Control or Bug Clear for Fruit & Veg), or fatty acids (e.g. Bayer Organic Pest Control or Doff Greenfly and Blackfly Killer)
- The best time for summer spraying is in early July when the more vulnerable newly hatched scale nymphs are present
- For scales on deciduous edible fruits, a plant oil winter wash (e.g. Growing Success Winter Tree Wash or Vitax Winter Tree Wash) can be used. This is used against the overwintering scale nymphs in December-January when the plants are fully dormant
- With grape vines, peel away the loose outer bark to expose the scales and other sheltering pests before treatment
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)