MATURE BOSTON IVY - Knowledgebase Question

EAST SYRACUSE, Ne
Question by JDEEGAN8
July 1, 2009
HI - IN JUNE THIS YEAR, I NOTICED BROWN SPOTS ON AN OTHERWISE VERY HEALTHY BOSTON IVY. I HAVE HEARD ONE CAN SPRAY A MIXTURE OF DISH SOAP AND WATER TO KILL WHATEVER IS CAUSING THE DAMAGE. IS THAT TRUE AND IF SO, WHAT RATIO OF WATER AND SOAP WOULD BE EFFECTIVE? IF THAT WILL NOT WORK, PLEASE ADVISE.

THANK YOU


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Answer from NGA
July 1, 2009

0

The fungus Guignardia bidwellii f. sp. parthenocissi causes distinct, angular, tan, spots to form on Boston ivy leaves in the spring and summer. A dark brown halo or margin along the edge of the spot is usually present. Within the tan areas, small black dots (fungal fruiting structures where new spores develop) can be observed soon after the spot reaches full size. You can maximize plant vigor by fertilizing and watering, however, watering should be done early in the day to give the foliage a chance to dry before nighttime. It is also helpful to pick and remove affected leaves as soon as they develop. Although not usually necessary, applications of fungicides can be made when new growth emerges in the spring. Among the compounds registered for use are mancozeb and copper compounds. Consult the label for dosage rates and safety precautions. Soapy water will not control this fungal disease. Good luck with your ivy.

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