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Pest Activity -- April 22
Pest Activity
> April22
Welcome to the Woody Ornamental Pest Scouting Report for Western Pennsylvania
brought to you by Penn State Cooperative Extension. This message will
be updated weekly with growing degree day counts and insect activity
through the end of June. If you would like an email notifying you of the posting of the latest report on the web, send your request to mcm2@psu.edu.
As of month date,
the following growing degree days with a base temperature of 50 degrees
have accumulated.
| Uniontown |
*** |
Mercer |
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| New Stanton |
151 |
Franklin |
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| Pittsburgh |
168 |
Meadville |
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| Wexford |
*** |
Erie |
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| Butler |
133 |
Harbor Creek |
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Pest Activity
Boxwood Psyllid
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Boxwood psyllids were active in Pittsburgh this past week and their feeding has started to cause the characteristic cupping of the terminals on the new growth on both common boxwood, Buxus sempervirens, littleleaf boxwood, Buxus microphylla, and the hybrids, Buxus microphylla var. koreana x Buxus sempervirens. A
soil drench of imidacloprid at this time can likely
eliminate the prospect of having leafminer damage for the next season by killing the next generation of leafmining larvae as they hatch in another month. Be sure to pull back any mulch around the bases of the boxwoods to be treated since pouring the imidacloprid mix onto the mulch will result in the pesticide being bound to the mulch and not taken up by the roots.
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Fact
Sheet
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Eastern Tent Caterpillar
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Tents in Allegheny County are 3-4 inched across and can still be managed by physical removal or with the use of an insecticide labeled for their control in Pennsylvania.
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Fact
Sheet
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European Sawfly
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European pine sawfly larvae just started to hatch in Pittsburgh late this week. Preferred host plants are Mugo, Scotch, Red, Japanese Red and Austrian Pines.
Soaps and oils do a great job, as do most of the over-the-counter pesticides that contain one of the common pyrethroids (e.g., bifenthrin, cyfluthrin, deltamethrin, andlambda-cyhalothrin). |
Fact
Sheet
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Hemlock Rust Mite
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This eriophyid mite is also active at this time.
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Fact
Sheet
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Honeylocust Plant Bug
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Honeylocust plant bug nymphs were actively feeding on the new growth of honeylocust this week in Allegheny and Westmoreland counties. This pest along with honeylocust spider mite and mimosa webwom can give a honeylocust a tattered look through most of the season.
The cultivar 'Sunburst' is especially susceptible to damage from this pest. Dr. Dave Shetlar at Ohio State, recommends only spraying if you have at least 6 nymphs per leaf.
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Fact
Sheet
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Spruce Spider Mites
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Spruce spider mites have hatched and are active on hemlock in Pittsburgh at this time.
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Fact
Sheet
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Imported Willow Leaf Beetle
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Adults of the imported willow leaf beetle were found feeding on Salix abla , White Willow this past week in Pittsburgh and Sewickley this past week. Control measures are generally reserved for heavy infestation on high value trees.
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Fact Sheet
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Hawthorn Leafminer
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The adults of hawthorn leafminer were just beginning activity in Pittsburgh this week. The larval stage of this pest is responsible for the brown splotches on hawthorn leaves evident later in the spring and summer. Crataegus crusgalli, Cockspur Hawthorn is especially susceptible to damage from this leafmining pest.
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The next scouting report will be on April 29.
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