Anthracnose

Pest: Anthracnose (Apiognomonia sp., Colletotrichum sp., Discula sp., Glomerella sp., Gnomonia sp., Marssonina sp., Stegophora sp.)

Pest Type: Infectious disease, fungi

Major Identifying Features: Dark lesions on various plant parts

Life Cycle: Anthracnose fungi occur on leaves and twigs, overwinter in infected twigs or dead leaf litter, in spring fungi spores spread via rain or sprinkler water to new growth where they germinate

Pest Rating: Moderate

Management Rating: Difficult

Host/Season/Outbreak Information: Prolonged spring rains after new growth appears, anthracnose fungi need water in order to disseminate and infect, they don’t spread in dry conditions

Damage Information: Cause dark, sunken lesions on mostly young leaves, stems, flowers, fruits, infects many deciduous and evergreen trees and shrubs (sometimes fruits, vegetables, and turf), anthracnose can attack and kill twigs, branches, and trunks, doesn’t harm plants if it doesn’t occur periodically

Management Options:

Prevention by choosing plants that are resistant to anthracnose, cultural control by pruning and burying infested twigs, mechanical control by raking leaves and pruning during winter, removing invested branches and twigs, controlling irrigation, chemical control with some systemic fungicides (WARNING ON THE USE OF CHEMICALS)

Sources:

http://www.ipm.ucanr.edu

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