Question
White & Brown Spots on
I have three verigated shrubs, two of which have slightly-raised white and brown spots all over the top and bottom of the leaves and stem. They are somewhat concentrated in areas of the plant (not all over - yet), and are about the size of plant lice but doen't appear to move. They do, however, easily fall off if rubbed with thumb. It appears to be some type of pest. What is it and how do I control it before it kills the shrubs?
AnswerHi It sounds like some type of scale.Due to the lack of pictures and the fact that there are hundreds of species of scales in the United States it's hard to tell. But if this is the problem here is a treatment.
Common Insecticides for Scale Insect Control Pesticide Options Timing/Remarks
paraffinic oil (Horticultural Oil)
insecticidal soap (Safer's Soap)
chlorpyrifos (Dursban)
carbaryl (Sevin)
acephate (Orthene)
malathion (Malathion) Spray after crawlers have hatched.
A second treatment 10 days later is sometimes necessary.
Read label to determine if product is labeled for host in question.
Hope this helps
