Woody Ornamental Integrated Pest Management at Penn State
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Pest Activity -- April 20 , 2007

Pest Activity > April 20

Welcome to the Woody Ornamental Pest Scouting Report for Western Pennsylvania brought to you by Penn State Cooperative Extension. This report is updated weekly with growing degree day counts and insect activity through the end of June. If you would like an email copy of this report, send your request to mcm2@psu.edu.

As of April 18, the following growing degree days with a base temperature of 50 degrees have accumulated.

Uniontown
143
Pittsburgh
130
Wexford
113
Butler
112










Pest Activity

Boxwood Psyllid

Young nymphs of the Boxwood psyllid were found inside the cupped leaves of Boxwood in Pittsburgh this week.

Fact Sheet

Eastern Tent Caterpillar

Young eastern tent caterpillar were observed in the Wexford area this week. The tent was only 1 inch long and the caterpillars were 1/4 inch long.

Fact Sheet

Hemlock Rust Mite

Hemlock Rust Mite remain active in SW Pennsylvania at this time. This is the time to apply controls.

Click here for current list of miticides labeled for use in Pennsylvania.

Fact Sheet

Spruce Spider Mites

On Wednesday, while scouting for this pest in the City of Pittsburgh, I observed the first newly hatched nymph. The majority of the overwintering eggs have not hatched but this should change with the predicted warmer temperatures.

Fact Sheet

White Vine Weevil

The adult females have started laying eggs in Pittsburgh. NOW is the time to apply insecticidal sprays to the tops of white pines for control of this pest.

Click here for current list of insecticides labeled for use in Pennsylvania.

Fact Sheet

OTHER PESTS

Apple Scab

This foliar disease which is responsible for early defoliation of susceptible crabs can be avoided by growing resistant cultivars
Scab-resistant crabapples: Adams, Baskatong, Brandywine, Callaway, David, Dolgo, Donald Wyman, Malus floribunda, Henry Kohankie, Henningi, Jewelberry, Ormiston Roy, Professor Sprenger, Malus seiboldi var. zum cultivar Calocarpa, Silver Moon, Sugartyme, Malus tschonoski, Weeping Candy Apple, White Angel, and White Cascade have been observed in many locations to have only slight to moderate scab infections.

If you are respoponsible for maintaining a crab that is susceptible, research has shown excellent control by applying propiconazole + chlorothalonil as flower buds begin to show color (early pink) and again 3 weeks later.

 

 

Hemlock Wooly Adelgid

The shot on the left was taken in the Shadyside area of Pittsburgh this week. If there are any hemlocks on the property you are maintaining, please check them for this pest. In Allegheny County, we have confirmed cases in Fox Chapel and the Shadyside area of Pittsburgh.

Thanks to Steve Miller of Bartlett Tree for sharing this information.

Controls for Hemlock Wooly Adelgid

 

The next scouting report will be on April 27, 2007 .
 

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