Hydrangea serrata Sticky Leaves - Causes & Fixes

Jump to cause: Aphid Infestation Scale Insects Whitefly Infestation

search Possible Causes

error

Aphid Infestation

Aphids are common pests for Hydrangea serrata that pierce the soft stems and leaf veins to suck sap, excreting a sugary substance known as honeydew. This sticky residue often attracts ants and can lead to the development of black sooty mold on the leaves.

Very Common

lightbulb

How to confirm: Inspect the undersides of the leaves and new growth for tiny, pear-shaped insects or clusters of eggs.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate the aphid population and stop the production of honeydew.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Wash the sticky residue off the leaves using a firm stream of water or a mild insecticidal soap to prevent sooty mold growth.

Bonide Captain Jack's Insecticidal Super Soap 32 oz

0.9 L • 1 pcs • Organic

$11

In Stock

3 Inspect the plant for ants, as they often protect aphids from natural predators to harvest the honeydew.

warning

Scale Insects

Scale insects attach themselves to the stems and leaf petioles of Mountain Hydrangeas, feeding on plant fluids and leaving behind a sticky honeydew coating. Unlike aphids, these pests often appear as small, immobile bumps or crusty patches.

Common

lightbulb

How to confirm: Check for small, hard, brown or white bumps firmly attached to the stems that do not move when disturbed.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the plant to kill the scale insects and remove the sticky honeydew coating.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Physically remove visible scale bumps from stems and leaves using a soft cloth or cotton swab dipped in rubbing alcohol.

3 Monitor the plant's moisture levels to ensure the plant remains healthy and resilient against further pest attacks.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

warning

Whitefly Infestation

Adult whiteflies inhabit the undersides of Hydrangea serrata leaves and excrete honeydew as they feed on plant juices. A sudden cloud of tiny white insects may emerge when the foliage is disturbed.

Common

lightbulb

How to confirm: Gently shake a branch over a white piece of paper to see if small, flying white insects appear.

build How to fix it

shopping_cart Recommended Products

1 Apply an organic insecticide spray to the undersides of the leaves to eliminate adult whiteflies and larvae.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Place yellow sticky traps near the foliage to capture flying adults and monitor the infestation level.