About This Publication

Authors
Pesticide safety: Penn State Pesticide Education Program
Insects and mites: Gregory A. Hoover, ornamental extension entomologist
Diseases: Gary W. Moorman, professor of plant pathology

The development and appearance of pests in Pennsylvania will vary
somewhat, depending on your location (e.g., north, south, elevation).
The treatment times are based on the best information we have now,
but they can vary from year to year. It is imperative that you monitor
pest activity each year.

This publication contains pesticide suggestions that are subject to change
at any time. These suggestions are provided only as a guide. Due to constantly
changing labels and product registration, some of the suggestions
given in this publication may no longer be legal by the time you read
them. Not all products have been evaluated for each pest listed. If any
information in these suggestions disagrees with the label, the suggestion
must be disregarded. The user of this information assumes all risks for
personal injury or property damage.

The authors and Penn State’s College of Agricultural Sciences assume
no liability resulting from the use of these pest control suggestions. It is
always the pesticide applicator’s responsibility, by law, to read and follow
current label directions for the specifi c pesticide being used.

Cover photographs courtesy of Gregory Hoover and Gary Moorman.
Adult viburnum leaf beetle with damaged viburnum foliage and elongate
hemlock scale on the lower needle surface of hemlock copyright Gregory
Hoover. Fire blight on hawthorn copyright Penn State Department of
Plant Pathology.

Penn State College of Agricultural Sciences research, extension, and resident education programs are funded in part by Pennsylvania counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture.

This publication is available from the Publications Distribution Center, The Pennsylvania State University, 112 Agricultural Administration Building, University Park, PA 16802. For information telephone 814-865-6713.

Where trade names appear, no discrimination is intended, and no endorsement by Penn State College of Agricultural Sciences is implied.

This publication is available in alternative media on request.

The Pennsylvania State University is committed to the policy that all persons shall have equal access to programs, facilities, admission, and employment without regard to personal characteristics not related to ability, performance, or qualifications as determined by University policy or by state or federal authorities. It is the policy of the University to maintain an academic and work environment free of discrimination, including harassment. The Pennsylvania State University prohibits discrimination and harassment against any person because of age, ancestry, color, disability or handicap, national origin, race, religious creed, sex, sexual orientation, or veteran status. Discrimination or harassment against faculty, staff, or students will not be tolerated at The Pennsylvania State University. Direct all inquiries regarding the nondiscrimination policy to the Affirmative Action Director, The Pennsylvania State University, 328 Boucke Building, University Park, PA 16802-5901, Tel 814-865-4700/V, 814-863-1150/TTY.

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