Horticulture
Department
PACIFIC NORTHWEST NURSERY IPM
Insects
hidden treasure
Photo: IPM images/Clemson
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PACIFIC NORTHWEST NURSERY IPM Insects
hidden treasure |
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alder
flea beetle |
Boxwood leafminer The boxwood leafminer, Monarthropalpusi flavus (Schank), is a key pest of boxwood. There is one generation a year with the larvae overwintering in the mined tissue of the leaves. The larvae resume feeding in the spring. The adult emergence in the Pacific Northwest occurs in late April through May and is associated with the timing of bloom of weigela, Weigela florida, and ranges from 300 to 650 degree days. Adults emerge, mate, and the female lays eggs deep into the tissue on the underside of the boxwood leaves. The eggs hatch in about three weeks and the larvae begin to feed causing the mining damage. The Below are some useful links for further information on this insect. Oregon State University boxwood leafminer fact sheet with regional information Penn State's Woody Ornamental IPM: Boxwood leafminer fact sheet. Both html and pdf versions are available. Includes images, information on resistant varieties, and management. North Carolina State University Extension: Boxwood leafminer fact sheet. This publication has nice images of the adult leafminer and useful chemical management information. G. d’Eustachio and M.J. Raupp's article in the
Journal of Arboriculture, APPLICATION
OF SYSTEMIC INSECTICIDES M.J. Raupp, I.H. Mars, G. d'Eustachio have also published useful info on boxwood leafminer in ISHS Acta Horticulturae 630, INTEGRATED APPROACHES FOR MANAGING THE BOXWOOD LEAFMINER, MONARTHROPALPUS FLAVUS. The abstract details additional work with particular emphasis on resistant cultivars. S. Gill, P. Shrewsbury, both from the University of
Maryland and J. Lutz, Joanne’s IPM, Inc. have also posted their work
looking at chemical management of boxwood leafminer, Evaluation
of Systemic Insecticides Imidacloprid and Thiamethoxam For Control of
Boxwood leafminer |
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| Website editor: Robin Rosetta |
