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Scouting Watch

May 11, 2005

Bridal wreath spirea or Vanhoutte spirea (Spiraea x vanhouttei) is blooming in southern and central Illinois. This is a major phenology plant in Don Ortonís book Coincide, available from the publisher, Labor of Love Conservatory, 468 S. President, Suite 103, Carol Stream, IL 80188-2894; (630)668-8597. When a phenological event predicts that a pest is susceptible to control, one needs to scout to verify that the pest is indeed present and in a susceptible stage before using a control measure. Following are the most common pests that are in susceptible treatment stages during Vanhoutte spirea bloom.

Full bloom

Birch leafminer young larvae

Elm leaf beetle young larvae

European pine sawfly feeding larvae

Gypsy moth feeding larvae

Pine needle scale crawlers (first generation)

Full to late bloom

Lilac (ash) borer newly hatched larvae

Oystershell scale crawlers (brown race)

Finishing bloom

Bronze birch borer newly hatched larvae

Most blossoms brown, still a few white

Flat-headed appletree borer larval hatch

Peach tree borer newly hatched larvae

Viburnum borer newly hatched larvae

Bloom finished

Oystershell scale crawlers (gray race)

Author: Phil Nixon


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