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Photo by David Almquist on, used with permission.
Camphor Shoot Borer (Cnestus mutilatus) - Articles Articles
Camphor shoot borers are an introduced species of ambrosia beetle that attack small-diameter branches and trunks of stressed, weakened, and dying trees. They also accidentally bore holes into plastic gasoline containers, hoses, and tanks. More
Steatoda grossa female. Photo by Steven Jacobs, Penn State Extension
False Black Widow Spider - Articles Articles

False Black Widow Spider

Steve Jacobs

The false black widow is found in the coastal states of the Atlantic, Gulf, and Pacific regions. It is a common spider in homes and other structures. More
Parasteatoda tepidariorum female. Photo by Steven Jacobs, Penn State Extension
Common House Spider - Articles Articles

Common House Spider

Steve Jacobs

Parasteatoda tepidariorum is widely distributed throughout the world. It commonly constructs webs in the corners of walls and windows in houses and barns. More
Eris militaris. Photo by Lynette Elliott,, photo# 457511
Bronze Jumper - Articles Articles

Bronze Jumper

Steve Jacobs

This spider is found throughout most of the continental United States and Canada. More
Cheiracanthium inclusum male. Photo by Steven Jacobs, Penn State Extension
Agrarian Sac Spider and Longlegged Sac Spider - Articles Articles
Sac spiders are found on foliage; under leaf litter, stones, and boards; on buildings under windowsills and siding; and in wall and ceiling corners in homes. More
Phidippus audax showing green chelicerae. Photo by Ryan Kaldari, WikiMedia
Bold Jumper Spider - Articles Articles

Bold Jumper Spider

Steve Jacobs

The jumping spiders are small, compact hunting spiders. Phidippus audax is the most common jumping spider seen in and around Pennsylvania homes. More
Paraphidippus aurantius female. Photo by Isa Betancourt,, photo# 1031635
Emerald Jumper - Articles Articles

Emerald Jumper

Steve Jacobs

This colorful spider had not been recorded previously in Pennsylvania. However, it has been identified in Delaware, Maryland, Virginia, and ten other states. More
Araneus saevus male. Photo by Steven Jacobs, Penn State Extension
Fierce Orbweaver - Articles Articles

Fierce Orbweaver

Steve Jacobs

Araneus saevus is found from Canada into the northern United States. It can be seen in forested areas and suburbia with mature landscape plantings. More
Trachelas tranquillus female. Photo by Steven Jacobs, Penn State Extension
Broad-Faced Sac Spider - Articles Articles

Broad-Faced Sac Spider

Steve Jacobs

Trachelas tranquillus can be found on foliage; under leaf litter, stones, and boards; and on buildings under the windowsills and siding. More
Argiope aurantia on web showing stabilimentum. Photo by Deisy Mendoza, WikiMedia
Yellow Garden Spider - Articles Articles

Yellow Garden Spider

Steve Jacobs

Yellow garden spiders are seen in gardens, tall weeds, and sunny areas with bushes and other supporting structures on which they build their large orb webs. More
Araneus diadematus female. Photo by Steven Jacobs, Penn State Extension
Cross Orbweaver Spider - Articles Articles

Cross Orbweaver Spider

Steve Jacobs

The cross orbweaver was probably introduced from Europe. This showy orbweaver is commonly encountered next to buildings with exterior lighting. More
Tegenaria domestica male. Photo by Steven Jacobs, Penn State Extension
Barn Funnel Weaver Spider - Articles Articles
This funnel weaver is found throughout most of the United States, most notably in sheds and barns, in the crevices of doors, and under rocks and boards. More
Whitney Cranshaw, Colorado State University.
Banded Garden Spider - Articles Articles

Banded Garden Spider

Steve Jacobs

Banded garden spiders inhabit similar locations as yellow garden spiders, but are not as common in Pennsylvania. More
Joseph Berger,
Hacklemesh Weaver Spiders - Articles Articles
Amaurobius and Callobius species of spiders are found in damp locations under bark, leaf litter, and stones, as well as in woodpiles and other protected areas. More
Tigrosa aspersa. Photo by Jim Eckert,, photo #1540834
Wolf Spiders - Articles Articles

Wolf Spiders

Steve Jacobs

Wolf spiders are large hunting spiders. Two notable species, Hogna carolinensis and H. aspersa, are occasionally encountered in Pennsylvania homes. More
Herpyllus ecclesiasticus. Photo by Joseph Berger, Bugwood
Parson Spider - Articles Articles

Parson Spider

Steve Jacobs

Stealthy ground spiders hunt at night and hide under leaves, boards, and stones during the day. The most commonly encountered of these is the parson spider. More
Photo: Holly Raguza, Pennsylvania Department of Agriculture
How You Can Comply with the Spotted Lanternfly Quarantine Regulations - Articles Articles
Some tips to help you avoid spreading Spotted Lanternfly (SLF) and be in compliance with the Pennsylvania Department of Agriculture (PDA) regulations. More
Spotted Lanternfly: What to Look For
Spotted Lanternfly: What to Look For - Articles Articles
Spotted Lanternfly, Lycorma delicatula, is a new threat to Pennsylvania and the United States, and experts are still learning how to combat it. More
The Chinese chestnut tree in full bloom can be very attractive. Photo: Tom Butzler, Penn State
Trees in the Landscape: The Stinkers - Articles Articles
We place trees and shrubs in the landscape for a variety of reasons; fall color, flowers, shade, winter interest, and fruiting characteristics. And let’s not forget the smell. More
The original laboratory of S. W. Frost (entomologist) and R. C. Walton (plant pathologist) in the former Arendtsville Hotel, 1918-1922. Photo: Penn State Archives
Early History of the Arendtsville Fruit Laboratory - Articles Articles
In the letter below, Dr. Frost describes the challenges faced by the first scientists who started the Arendtsville Fruit Lab, which went on to become the Fruit Research and Extension Center. More
Choosing a Qualified Pest Management or Lawn Care Company
Choosing a Qualified Pest Management or Lawn Care Company - Articles Articles
When you discover a pest problem in or around your home, such as the spotted lanternfly, the first step is to identify the pest. More
Photo 1. Blueberry blossom showing the characteristic flowers of this plant. Note that the flowers are closed, bell-shaped and pendant. Photo credit: Nicole Castle, contributed to Plant Village.
Who Pollinates Pennsylvania Blueberry Plants? - Articles Articles

Who Pollinates Pennsylvania Blueberry Plants?

Margarita López-Uribe, Ph.D., Shelby Fleischer, Ph.D., Kristal Watrous, Nolan Amon

Blueberries (genus Vaccinium) are a high-value crop in Pennsylvania and the United States, with an estimated value of at least $825 million to the US economy in 2014. More
Close-up of fringetree flowers which have some fragrance to them. Photo: Mike Masiuk, Penn State
Spring Floral Display: Chionanthus Virginicus, White Fringetree - Articles Articles
Although the common name, white fringetree, alludes to a tree, it is often treated as a large shrub in the landscape, reaching a range of anywhere from 12 to 20 feet. More
Mulching Landscape Trees
Mulching Landscape Trees - Articles Articles

Mulching Landscape Trees

David R. Jackson

Mulches are materials placed over the soil surface to enhance landscape beauty, improve soil conditions, protect plants from foot traffic and lawn equipment, and suppress weeds. More
Spotted lanternflies captured on a sticky band. Photo: Emelie Swackhamer, Penn State
Spotted Lanternfly Management: Placing Sticky Bands on Trees - Articles Articles
This article summarizes one method of capturing and killing spotted lanternfly (SLF): placing sticky bands on trees. More
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