Control the insects which carry the virus. The spotted wilt virus causes mottled leaves and purplish spots on stems and leaves. The blossoms have discolored or bleached spots. Destroy infected plants and control the insects which carry the virus. Bud drop is caused by poor culture and is made worse by low phosphorous and potassium, high nitrogen, and inadequate light.
Powdery mildew covers the plant with a white, powdery growth.
Sprays of triforine of benomyl will control the problem. 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.