What causes spots on hydrangea leaves?

Fungal Leaf Spots on Hydrangea Leaves There are two types of fungal diseases can infect hydrangeas – cercospora leaf spot and anthracnose. Anthracnose is caused by the fungus Colletotrichum gloeosporioides. This produces large brown spots with lighter brown or tan centers in the spots.Click to see full answer. In this manner, how do you treat spots on hydrangea leaves? Leaf spots To control leaf spot, avoid watering your hydrangeas from overhead, and again, remove and destroy diseased plant parts. If summer rains make the problem worse, try a fungicide such as Immunox (always follow label directions).Subsequently, question is, what to spray on hydrangeas for bugs? If the problem isn’t severe, prune off and destroy the affected leaves. Otherwise, use a rust specific organic fungicide such as Neem Oil 3n1. To prevent many diseases, use a soaker hose or spray nozzle to water the roots of plants. And water in the morning, so any water on the leaves has a chance to dry. Likewise, what causes black spots on hydrangea leaves? Black spotting can originate from a number of fungal diseases, such as ANTHRACNOSE And CERCOSPORA leaf spot: Cercospora leaf spot (Cercospora hydrangea) begins as brown or purple spots that develop centers of gray and halos of the brown and purple on the leaves at or near the base of the plant.What causes red spots on leaves?Red leaf spot is a disease that occurs on creeping bentgrass during warm and wet weather in the spring, summer, or fall. Red leaf spot is a ‘Helminthosporium’ disease, which is a complex of diseases caused by fungi that produce large, cigar-shaped spores.

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