Key Features
- Yellow leaf spots
- Dead leaf spots
- Yellow spots w/ green center
Symptoms
Symptoms are dependent upon the host species infected (and over 350 plants are reported hosts). Mottling (mixed yellow and green leaf sections) is the most common symptoms, though, yellow streaks, ring spots or lines are common on some hosts. Yellow spots progress to dead spots on some hosts. Some plants will persist with regular symptom development without ill-effect. Others will slowly decline, die over winter and fail to return the following spring.
Biology
This virus is spread (vectored) by the stubby root nematodes (Trichodorus and Paratrichodorus) and cuttings from infected plants. Unlike the tobacco mosaic virus, this disease cannot be spread when infected plants touch each other.
Management Recommendations
Because of the wide host range of the virus, and ubiquitousness of the native stubby root nematodes, infected plants should be removed and destroyed. The best approach to managing this disease is to avoid introducing it into your landscape.
Effective Pesticides
Pesticides are neither available nor recommended for managing this disease.
Resources
