Galls are formed on plant parts including fruit caused by feeding insects which inject chemicals that induce the plant to make abnormal growths. On foliage you may see raised structures, thickened/curled leaf margins, blisters, excessive growth of hairs or discoloured patches. Bud feeding gall mites cause swollen buds which later dry up or evolve into cauliflower like structures. Incidence of gall damage does not usually harm or damage plant growth and control is not necessary.
Gall forming pests include: Gall midges, gall mites, gall wasps
No chemical controls registered for use against these pests. Use cultural controls where problem is considered unsightly i.e. picking off the infested plant material at first signs of the attack.