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Cottony Camellia Scale Diagnostic Guide

Pulvinaria floceifera

Cottony camellia scale (Pulvinaria floccifera) is a soft scale causing mostly aesthetic damage, though it can weaken plants making them susceptible to other insects/diseases. Cottony ovisacs make this scale relatively easy to identify along with copious amounts of honeydew.

Trees at Risk

Common hosts of the cottony camellia scale include: camellia, holly, yew, euonymous, maple, mulberry, hydrangea, rhododendron, and English ivy.

Yew

Maple

Holly

Mulberry

Euonymous

Camellia

Signs of Damage

  • Light green leaves.
  • The insect is 1/8 inch long, oval, yellowish tan, with a brown margin.
  • Forms cottony ovisac.
  • Often on the underside of foliage.
  • Sooty mold is often associated with CCS.
Cottony Camella Scale

Patrick Anderson, RTSA

Physical Appearance

  • Scales are cream to tan and elongate oval and relatively flat body.
  • Young females have a dark stripe down the middle and mottling at the sides.
  • Older scales are dark brown.
  • Eggs are laid in an ovisac produced beneath and behind the female.
  • Ovisacs are two or more times longer than the scales and are relatively flat, white, and fluffy.

Biology

  • Cottony ovisacs are laid in May.
  • Crawlers hatch in late May/June.
  • Female insect overwinters as instars.
  • Females mature in spring and lay eggs.
  • One generation per year.

Treatment Strategy

This is not an overly difficult insect to control. It is capable of laying up to 1,000 eggs at a time though, so monitoring is important. Large populations of scales are more difficult to control.

Other Treatment Practices

Maintain plant health and monitor closely for this insect.

  • Soil Application using Xytect 2F

    Dosage: 0.1-0.4 oz./inch DBH
    Timing: Any time the ground is not frozen
    Re-Treatment: Annually
    Xytect 2F
    Xytect 2F
    $69.60
  • Foliar Spray using Xytect 2F

    Dosage: 1.5 oz./100 gallons water
    Timing: At crawler emergence late May/June
    Re-Treatment: Annually as needed
    Xytect 2F
    Xytect 2F
    $69.60
  • Soil Application using Xytect 75WSP 22 packets

    Dosage: 1 packet/24-48 inches DBH
    Timing: Any time the ground is not frozen
    Re-Treatment: Annually
    Xytect 75WSP 22 packets
    Xytect 75WSP 22 packets
    $148.00
  • Foliar Spray using Xytect 75WSP 22 packets

    Dosage: 1 packet/300 gallons water
    Timing: At crawler emergence late May/June
    Re-Treatment: Annually as needed
    Xytect 75WSP 22 packets
    Xytect 75WSP 22 packets
    $148.00
  • Soil Application using Transtect

    Dosage: 1 packet/5-17 inches DBH, or 10-17 feet shrub height
    Timing: Early spring - summer
    Re-Treatment: Annually
    Transtect
    Transtect
    $326.00
  • Foliar Spray using Transtect

    Dosage: 1 packet/25-50 gallons water
    Timing: At crawler emergence late May/June
    Re-Treatment: Annually as needed
    Transtect
    Transtect
    $326.00
  • Foliar Spray using RTSA Horticultural Oil

    Notes: Combined with Distance
    Dosage: 0.25-1.0 gallons/100 gallon water
    Timing: Apply during dormant season or at crawler emergence in May/June
    RTSA Horticultural Oil
    RTSA Horticultural Oil
    $39.00
  • Foliar Spray using Distance

    Notes: Combined with RTSA Horticultural Oil
    Dosage: 8-12 oz./ 100 gallon water
    Timing: Apply during dormant season or at crawler emergence in May/June
    Distance
    Distance
    $269.00

Treatment Expectations

Good results should be possible with the above treatments.

A Diagnostic Guide is designed to help you identify a pest issue and management solutions. Always refer to product label for all rates and approved uses. Some images courtesy forestryimages.org. Use of the images does not imply endorsement of treatments by forestryimages.org

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