Delaware horticulture - Delaware

Garden Calendar - Philadelphia Inquirer

17.04.09

Tomorrow

Volunteer to deadhead, weed and prune roses; 9 a.m. Free; bring gloves, clippers, water, bug spray. Glen Foerd on the Delaware, 5001 Grant Ave.; 215-632-5330, www.glenfoerd.org .

The Culinary Gardener Seminar on growing herbs; 11 a.m. to noon. Free. Smith & Hawken, Promenade at Sagemore, 500 Rte. 73 S., Marlton; 856-355-3990.

The Wonders of Lavender Talk by Jane Irvin-Klotz; 1 p.m. (barn), part of "Rural Life in 1900" event, 11 a.m. to 4 p.m., with demonstrations of life 100 years ago, children's activities, lavender plants and local produce for sale, tours of mansion. Free. Pennypacker Mills, Route 73 (Skippack Pike) and Haldeman Road, Schwenksville. Information: 610-287-9349.

Roses and Their Names Talk by rosarian and garden writer Stephen Scanniello at the Del-Chester Rose Society meeting; 2 p.m. Free. Westtown Township Building, 1039 Wilmington Pike (Route 202), West Chester. Information: 610-692-5631, www.mhuss.com/dcrs

Source: Philadelphia Inquirer, PA

Landscape - Scale Insects: White Prunicola Scale

This is the eleventh in a series on scale insects in the landscape. This post is on the White Prunicola Scale. Information is from the University of Maryland.

White Prunicola Scale (Pseudaulacaspis prunicola), Family Diaspididae

Plants Damaged: This scale is commonly found on Prunus species but can also be seen on magnolia, ligustrum, rhododendron, forsythia, boxwood, and lilac.

Damage Symptoms: Dieback of twigs and yellowing of foliage

Life Cycle: Crawlers are present in May. A second generation occurs in July and a third in September. Crawlers appear about 2 weeks earlier than white peach scale. Crawlers are out in early May to June. Second generation crawlers are out from mid-July to mid-August. The third generation crawlers are out in September.

Monitoring: Both male and female crawlers are salmon colored.

Control: When crawlers are out, Distance mixed with 1% horticultural oil gives excellent control.

Information from "Scales Commonly Encountered in Maryland Landscapes and Nurseries" by Stanton Gill, Extension Specialist in IPM for Nurseries and Greenhouses,and Suzanne Klick and Shannon Wadkins, Technicians, Central Maryland Research and Education Center University of Maryland Cooperative Extension.

Source: University of Delaware Cooperative Extension, Kent Co., Commercial Horticulture Information