Vinca major, Vinca minor
Canker and Dieback (fungus – Phomopsis livella): Shoot tips will turn dark brown-to-black and die back to the soil. Favored by rainy weather. Preventive spray of copper fungicide starting in spring on new growth will control the fungus.
Leaf Spot (fungus – Alternaria spp.): Brown circular-to-oval spots on leaves. Control with copper or other recommended fungicides.
Dodder (Parasitic plant – Cuscuta indecora): See section on Dodder.
Curly Top (virus): (See the section on Curly Top)
Aster Yellows (mycoplasma): Reported in Texas.
Consult the Chemical Control Supplement (B-1140A) for specific chemical control suggestions.