Bacterial Xanthomon as leaf spot of hedera helix

Disease Information

Bacterial Xanthomonas leaf spot

(Xanthomonascampestrispv. hederae)

Symptoms

Brown to black circular to irregular spots often with yellow to red halo and a water-soaked margin found first on older leaves; stem and petiole cankers may also develop. W ith heavy infection, the young leaves can be malformed. Common on juvenile ivies and on adult forms when overhead irrigation is used; predominant in summer months.

Management

Reduce overhead irrigation; use drip irrigation to prevent spread of the pathogen through water splashes. Use only disease-free propagation material. Trim and dispose of infected plant material. Treat with copper hydroxide (Kocide , Blue ® Shield , Champ , Champion ), copper ® ® ® sulfate pentahydrate (Phyton ), or fosetyl ® aluminum (Aliette ) to reduce disease ® spread.



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