Septoria leaf spot

Class: Fungi
Common Name: Septoria leaf spot
Scientific Name: Septoria spp.
Potential Host:

Tomato, cannabis, blueberry, persley, and many more


Tan to brown leaf spots, small black fruiting bodies may be visible inside the spot.

Who Am I?

Septoria leaf spot is caused by ascomycete pycnidia-producing fungi. These fungi can be seed-borne and are also transmitted using other infected plant material. It can also be spread by workers moving through wet foliage.

Control Measures

Avoid overhead irrigation and allow good air circulation. Both these measures can minimize the duration of leaf wetness which is a favorable condition for septoria leaf spot development.

Tebuconazole, azoxystrobin, boscalid + pyraclostrobin and mancozeb.

Copper-based fungicides

Bacillus subtilis

*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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