Pest Activity -- May 27

Pest Activity > May 27

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 May 25, the following growing degree days with a base temperature of 50 degrees have accumulated.

Uniontown	538	Mercer	375
New Stanton	410	Franklin	404
Pittsburgh	463	Meadville	258
		Erie	243
Butler	311	Harbor Creek	158

Pest Activity

Anthracnose

In many areas, the effects of earlier anthracnose infections on sycamore and London Plane are evident. From a distance, the tree looks sparsely foliated and closer examination reveals leaves with extensive areas of brown tissue. These leaves will soon be dropping to the ground. Since most sycamores and many London Planetrees are raised from seed, there is great genetic diversity in resistance to anthracnose. It is not uncommon to see two trees just 100 feet apart with varying degrees of anthracnose symptoms. In fact, that is the situation for the two trees pictured to the left, that are located in Way Park in Edgeworth, PA (images taken 5/25/05)

Azalea Lace Bug

	Nymphs are active at this time
Fact Sheet

Bagworm

	Young larvae have just started to feed on a wide variety of plants in Pittsburgh.
Fact Sheet

Eastern Tent Caterpillar

	Larvae are leaving the tents and looking for places to spin cocoons.
Fact Sheet

Fourlined Plant Bug

	Small red and black colored nymphs are busy feeding on a wide variety of herbaceous plants and a few woody plants (forsythia) at this time. The damage is characterized by the 1/16" circular black spots on leaves. Insecticidal soap and pyrethrins will control the young nymphs. Please check the label before using on a specific plant.
Fact Sheet

Pine Needle Scale

	Female scales examined on Mugo Pines in Pittsburgh this week had active crawlers beneath the white waxy covering. The crawlers have not started to migrate, but should do so next week if the seasonal temperatures continue.
Fact Sheet

The next scouting report will be on June 3 .