I think I have scale on my scabiosa pin cushion flowers
Wanted to know if I should spray with neem oil- I live in So California - zone 9
Certified GKH Gardening Expert
Neem oil will not be effective to control an existing scale infestation. It works best as a preventive, before and during the inmature "crawler" stage. Scale insect adults are protected from contact sprays. During an active infestation you neem to use a systemic insecticide.