Q.Tips Of Mandeville Be Leaves Black.
The tips of my Mandeville leaves are turning brown/black and spreading. Also all the new growth and flower buds are withering and dying. There are webs on the plant. I sprayed with Neem oil. Which seemed to work, before the week was up it started attacking the new growth. Should I just continue to treat with Neem oil?
Certified GKH Gardening Expert
Yes, follow label instructions but it usually takes more than one application. If that doesn't seem to work, try an insecticidal soap.