Use acephate to control black vine weevil. Lace bugs cause leaf yellowing. Brown specks on the undersides of leaves are insect excrement. Sunny sites may lead to higher lace bug populations. Use sprays of acephate.
Mites cause leaf discoloration.
Scales may be found on branches and stems of unhealthy- looking plants. Use dormant oil in spring. Sprays of Sevin control crawlers. The preferred method of control involves regular inspection for early detection of the infestation then spraying with dormant oil. Visuals associated with this text.