The affected area is at first yellowish but becomes brown and brittle. If not controlled, the plants are stunted. Leafhoppers are controlled with Diazinon dust or sprays of Orthene, rotenone, methoxychlor, or Sevin. Thrips cause the under surfaces of petals to turn white and wither. Thrips are controlled with Sevin or rotenone.
Mites cause paling of the leaves.
Applications of rotenone will control mites. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension. Reprinting cannot be used to endorse or advertise a commercial product or company.