Leaf Spot

Symptoms of leaf spot disease are spots on the leaves/foliage. The spots are mostly brownish in colour, but sometimes can be tan or black. Rings or margins may also be present around the spots. Overtime the spots may combine and form big patches. Spots that are angular and located around the leaf vein are generally referred to as anthracnose. Leaves may also turn yellow and drop prematurely.

Chemical Control: Spray Thiram or Mancozide once a week.

Organic Control: Spray with a baking soda solution (a tablespoon of baking soda, 2 1/2 tablespoons of vegetable oil, a teaspoon of liquid soap, not detergent, to one gallon of water) or Neem Oil twice a week.

 

 

 

 

 

 

 

 

 

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Image sourced from https://www.extension.umn.edu/

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Mildew

Mildew is a thin, black or white growth produced on many surfaces by molds. Molds, on the other hand are simple plants. Molds develop mildew in hot and humid conditions. They grow usually during summer period especially in enclosed spaces. As they grow, they leave a musty odor. They are parasitic pathogens that infect leaves and fruits of plants.

Chemical Control: Carbendazim or Metalaxyl once every week.

Organic Control: Potassium bicarbonate fungicide, Vinegar (4 tbs of vinegar with 1 gallon of water) or Neem Oil on affected leaves every 3 days.

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Image sourced from https://www.http://amienvironmental.com/

Rust

Rust is a fungal infection that appears powdery and is yellow orange or brownish in colour. There are different types that affect specific plants. They spread by means of dust-like spores. Rust is encouraged by a humid, moist atmosphere and grows on the surface of leaves and sometimes stems. It is also a parasite that takes in nutrition from the plant. Rust can weaken plants and may result in total loss of leaves
and occasionally causes death of plants.

 

Chemical Control: Spray Proplcanazole or Triadimefon once every 2 weeks.

Organic Control: Spray copper sprays or apply sulfur powders and repeat every 7-10 days.

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Image sourced from http://www.sciencemag.org/

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Leaf Blight

Blight includes the presence of lines of *pycnidia on infected material. It can be found on the leaves (near the nodes), stem sections, seeds and even scattered on pods/fruit of the plant.

Chemical Control: Dithane 945 or Captan once every 2 weeks.

Organic Control: Apply copper-based fungicides and repeat every 7-10 days.

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*Pycnidia: An asexual fruiting body produced by mitosporic fungi

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Image sourced from http://www.sciencemag.org/

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