What Diseases And Problems Are Hydrangeas Prone To?


6 Answers

Aisha Profile
Aisha answered
It probably is a caterpillar or a cricket. If you find caterpillar worms on the leaves, you can get rid of them by spraying or dusting with Bacillus Thruingensis. If you find no worms, it might probably be because of snails and slugs so you can use the same to treat the ground under the leaves.
Azhar Mehmood Profile
Azhar Mehmood answered
Hydrangeas are affected by diseases and insects under certain growing conditions though Hydrangea species being found in the landscape areas are relatively pest free. Powdery mildew is the major disease found in bigleaf Hydrangea as this is a common disease of plants being grown in shade and under high humit conditions. In this disease leaves of a plant are covered with a light gray colored powdery-looking substance.
In late summer and early if leaves develop brown to gray lesions surrounded by pruple holes then it's a sign or indication that leaves are being attacked by several fungal leaf organisms. Though plants are rarely killed by this disease but they look very unattractive due to severe infestation.
Root rots normally attack Oakleaf Hydrangeas. Armillaria is the most common root rot. The plants noramlly die of this root rot. The plants will not recover when watered if look wilted.
Rust is the common disease of Smooth Hydrangea. In this disease small organge spots appear on the back side of leaves. These spots release orange dust if back sides of leaves are rubbed. These orange dust contains the spores of the fungus. This disease rarely kills plant and usually attack plants near the end of growing season.
Anonymous Profile
Anonymous answered
Tdrangea has a web coveing the beautiful blooms and little white powdery substance on top and under the leavs  I have cut off the blooms and now it looks like hell  I have sprayed it twice with dish detergent and water  what happened  b
Julii Brainard Profile
Julii Brainard answered
Mites and aphids.

Root rot if over-watered or poorly drained.

Japanese beetles and deer feed on hydrangeas.

Bacterial blight can cause flowers and leaves to wilt. This is a problem in very hot and very wet locations. The actual culprit organism is Pseudomonas solanacearum. There is no treatment for this; hydrangeas are just not suitable for certain climates.

Grey leaf spots may appear on hydrangeas due to funghi. In a severe form this leds to powdery mildew, which must be treated with fungicides. A milder problem are from another fungus, Rust spots appearing on leaf undersides. These eventually cause leaves to curl up and die, thankfully usually near the end of the growing season.

All fungal problems are more likely when a plant has too much sun and too much water on the leaves (better to apply water only to roots).

Botrytis cinerea can cause blight in dense flower clusters after a frost or a prolonged rainy period.

Big yellow spots on leaves indicate an iron deficiency in the soil.

Too cold conditions may cause the plant to never flower (blooms killed by frost).

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