Clavibacter Michiganensis Alert


Symptoms first manifest on lower foliage and include chlorosis, brown necrosis, and leaf tissue shriveling. With time, vascular tissue turns tan in color and eventually a red-brown.

Symptoms on Fruits: Small, round white to yellow spots with brown centers may develop on green fruits.

Who Am I?

Bacterial canker of tomato is a serious disease that favors high moisture conditions and warm temperatures. Outbreaks can cause significant damage to tomato plants.

Control Measures

Monitoring: Inspect the field regularly so that bacterial canker can be detected at an early stage.

Do not touch wet plants that are infected. Postpone any scheduled practice in the field until foliage is completely dry.

Sanitation: Sanitize all equipment that came into contact with infected plants.

Chemical management is concentrated around preventative spraying applications of copper hydroxide-based products.

*Names marked in red are considered to be highly poisonous to beneficial insects.

*Names marked in green are considered to be organic and IPM (integrated pest management) compatible.

Caution and careful notice should be taken when using any plant protection products (insecticides, fungicides, and herbicides). It is the grower’s sole responsibility to keep track of the legal uses and permissions with respect to the laws in their country and destination markets. Always read the instructions written on labels, and in a case of contradiction, work in accordance to the product label. Keep in mind that information written on the label usually applies to local markets. Pest control products intended for organic farming are generally considered to be less effective in comparison to conventional products. When dealing with organic, biologic, and to some extent a small number of conventional chemical products, a complete eradication of a pest or disease will often require several iterations of a specific treatment or combination of treatments.

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