Stem Canker of gardenia

Disease Information

Stem Canker  

Symptoms and damage

In general, cankers are dark, oval or elongated stem lesions that may be sunken with a raised edge. With time, the canker may develop into a gall (a swollen area resulting from infection). Cankers are most often found on stems (especially near soil level) of a gardenia; however, leaves and roots are also susceptible. They are caused by the fungus, Phomopsisgardeniae, which gains access to the plant through wounds. The fungus remains localized near the canker and with high humidity will produce spores that are easily spread by rain or overhead irrigation. The fungus survives the winter within the canker.


The most important aspect of controlling this disease is to prevent injury to the gardenia. Infected stems should be pruned out, taking care to disinfect pruners in a 10% bleach solution (1 part bleach to 9 parts water) or 70% alcohol solution between cuts. Avoid stressing an affected gardenia further by over- or under-fertilizing, or over- or under-watering. Irrigate at the base of the plant to minimize moisture on plant surfaces as well as spread of spores. Affected plants that are growing poorly should be removed and destroyed. Any new gardenias should be planted in a different location. In a home landscape, fungicides are generally not practical or effective control options.

Fungicides for Gardenia Disease Control (Chlorothalonil- (Horticultural oil1,2)-( Myclobutanil)- (Neem oil)- (Propiconazole)-( Sulfur2)-( Thiophanate-methyl) .




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