When to Manage Scale Insects on Trees and Shrubs
Always evaluate the need to treat before applying any pesticide, organic or synthetic. Plus, needlessly applying chemicals can harm the good insects that help manage garden pests.
This strategy applies to scale insects as well. Their hard-shell coverings can hang on branches for many seasons after they’ve died. Use a sewing needle to flip over the waxy coating and a hand lens for a closer look. Living scale are plump and round and often bleed when uncovered.
Check at least 25 scale insects. Multiple the number of live scale insects found in every 25 checked by 4 to calculate the percentage of live insects.
If the percent of live scale is low, a dormant oil spray applied to plants when dormant or insecticidal soap when the crawlers are active will usually provide sufficient control.
A bit more information: Consider testing scale on several parts of the plant. This provides a more accurate assessment of the live population. Treating only when necessary allows the natural enemies to help keep these pest populations under control.
Related
Categories
Upcoming
Events & Webinars
Mar. 18, 2026
FREE WEBINAR:
Patio, Deck and Balcony Gardens
Register here
March 21 & 28, 2026
REALTORS Home & Garden Show
West Allis, WI
More information
March 24, 2026
SC Johnson Golden Rondelle Theater
Community Program
Racine, WI
More information
March 26, 2026
FREE WEBINAR:
Getting Started Growing Vegetable and Flower Gardens
Register here
April 1, 2026
FREE WEBINAR:
Growing a Bountiful Harvest
Register here
April 9, 2026
FREE WEBINAR:
7 Steps to Managing Water on Your Property
Register here
April 11, 2026
A Day in the Garden
Fond du Lac, WI
Register here
April 18, 2026
3rd Annual Spring Rally
Oshkosh, WI
Register here
April 19, 2026
Ebert's Greenhouse Village
Ixonia, WI
April 23, 2026
Iowa State University
More information
April 25, 2026
Pasquesi Home & Gardens
Lake Bluff, IL
April 26, 2026
Ebert's Greenhouse Village
Ixonia, WI
May 2, 2026
Ebert's Greenhouse Village
Ixonia, WI
May 6, 2026
FREE WEBINAR:
Adding Native Plants
to Any Size Gardening Space
Register here
May 9, 2026
Ebert's Greenhouse Village
Ixonia, WI
May 10, 2026
Ebert's Greenhouse Village
Ixonia, WI
May 16, 2026
Ebert's Greenhouse Village
Ixonia, WI
May 17, 2026
Ebert's Greenhouse Village
Ixonia, WI
May 21, 2026
FREE WEBINAR:
Planting & Care of Your Rain Garden
Register here
June 3, 2026
FREE WEBINAR:
Managing Your Landscape
with Pollinators in Mind
Register here
Sept. 3, 2026
FREE WEBINAR:
Tree Planting and Care
Register here
Sept. 12, 2026
Knowledge in Bloom Conference
Milwaukee, WI
Register here
Sept. 17, 2026
FREE WEBINAR:
Fall Landscape Care and Planting
Register here
WATCH ON-DEMAND WEBINARS
Learn More
Book an Appearance
Sign up for Melinda's free e-newsletter for a chance to win a Birds & Blooms' Ultimate Gardening Guide!
ENTER NOW
