Anthracnose Control

Anthracnose is caused by a group of specialized fungi that cause brown, tan, or black splotches on young leaves and can eventually defoliate trees and cause cankers and dieback in branches.

Since these fungi are specialized, each species that causes Anthracnose is only able to infect a small range of hosts. A species of fungi that attacks Elm trees won't attack an Oak tree that is nearby.

Wet and cool spring conditions are favorable for this pathogen. Avoid overhead watering. Fungal spores can survive winter in leaves, twigs, fruit, and buds. Remove plant debris to prevent overwintering. Trees that have experienced Anthracnose infections in previous years should be monitored for symptoms each spring and treated with fungicides accordingly. 

Controlling this pathogen comes down to preventative fungicidal sprays, cultural control, pruning, and environmental conditions and planting resistant cultivars.

Anthracnose leaf spots are caused by Colletotrichum and Gloeosporium. Many ornamental and vegetable greenhouse crops are susceptible, especially Cucurbits. Symptoms begin with small, brown spots on leaves and petals, eventually forming large areas of dead tissue. A diagnostic sign for anthracnose is the presence of pink to orange spores oozing from lesions.

Visit the Greenhouse Management page Look Close, is it Anthracnose? for detailed information on this disease.

Control options include Double Nickel, Guarda, Cease and Regalia 

Always review product labels prior to purchase to confirm your purchase is labeled for the specific pest, disease and/or crop you are treating. Accurate identification of pest and/or disease is essential to successful treatment, as are proper cultural and sanitation practices. Local extension offices can help identify pests and diseases. Additionally, feel free to send us images and we will do our best to assist you.
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