Keystone Tree Experts


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Since 1968

215-348-4444

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Cottony Scales

Cottony Scales

DESCRIPTION

Scale insects tap into plants and feed on plant sap, weakening and even killing plants over time. Cottony Scale insects produce cottony egg masses from which young crawlers emerge. These cottony masses can contains hundreds of eggs each. Cottony Scales include Cottony Camellia Scale (Hollies and verious other plants), Cottony Taxus Scale (Yews), Cottony Maple Scales (Silver Maple, Dogwood and others) and Azalea Bark Scale (Azalea, Andromeda and Rhododendron).

Cottony Scales

LIFE CYCLE

The scales are usually first noticed when the females produce an egg sac which appears to be an elongated ball of cotton. Each cottony mass contains up to 1,500 eggs. After the eggs hatch (usually in June) crawlers emerge and leave the “fluff”. The crawlers walk onto the leaves and twigs and produce large amounts of honeydew, a sugary liquid excreted by many sap-feeding insects. They eventually molt into scales. The male scales emerge as tiny winged gnat-like insects and move around in search of females. After mating, the males die and the female attaches herself to the plant permanently by inserting her mouthparts. In the spring, the female begins to produce copious amounts of honeydew and in May to early June, they begin to produce their ovisacs.

DAMAGE

Cottony Scales

The white egg sacs are what usually attracts attention to the plant. The developing scales can produce large amounts of honeydew. Honeydew is commonly mistaken for “tree sap” dripping on cars, sidewalks and lawn furniture lying under trees. If honeydew is allowed to remain, molds called “sooty fungus” grow on the material, turning the surface a gray-black color. This is a primary indicator of a soft scale problem.

These insects suck nutrients from the trees or shrubs and can weaken and stress the plant. Leaves may appear off-color and drop prematurely.

CONTROL

Timing is critical and should be done during the crawler stage. Preventative dormant oil sprays may be effective when populations are low. Other treatments are necessary with more severe infestations.

Insect & Disease Index

  • Aphids
  • Apple Scab
  • Bacterial Leaf Scorch
  • Bagworm
  • Birch Leafminer
  • Black Knot Disease
  • Boxwood Leafminer
  • Cankerworm
  • Cooley Spruce Gall Adelgid
  • Cottony Scales
  • Cytospora Canker of Spruce
  • Eastern Tent Caterpillar
  • Elongate Hemlock Scale
  • Emerald Ash Borer
  • European Pine Sawfly
  • Gypsy Moth
  • Hemlock Rust Mite
  • Hemlock Woolly Adelgid
  • Honeylocust Plant Bug
  • Japanese Beetles
  • Lace Bugs
  • Mimosa Webworm
  • Peachtree Borer
  • Procera Root Disease of White Pine
  • Rhabdocline Needlecast of Douglas Fir
  • Spruce Spider Mite
  • White Pine Weevil

Member:

Professional Grounds Management Society   Pennsylvania Landscape and Nursery Association   ISA Certified Arborists on staff

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Keystone Tree Experts
259 North West Street
Doylestown, PA 18901
215-348-4444

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