Featured Research

from universities, journals, and other organizations

Venomous Brown Widow Spiders Making Themselves Known In Louisiana

Date:
May 13, 2007
Source:
LSU Agricultural Center
Summary:
A dangerous spider is making itself known to Louisiana residents. The brown widow spider is becoming more common in the state of Louisiana, according to entomologists.

A brown widow spider.
Credit: Dr. Chris Carlton, Louisiana State Arthropod Museum

A dangerous spider is making itself known to Louisiana residents. The brown widow spider is becoming more common, according to entomologists with the LSU AgCenter.

Generally found in tropical areas, the brown widow spider is closely related to the black widow spider and is poisonous, according to LSU AgCenter entomologist Dr. Dennis Ring.

Experts say the spider ranges in color from gray or tan to dark brown and may reach 1 inch to 1 inches long. Like its better-known black widow cousin, the brown widow spider has a yellow-to-orange hourglass marking on the underside of its abdomen. It also has black and white marks on the top of the abdomen and often has dark bands on its legs. "Its venom is more toxic than the black widow’s," Ring said. "But it doesn’t put out as much venom in its bite."

Ring said the brown widow spider is most often found in areas that haven’t been disturbed, such as brush piles, wood piles and areas where hurricane debris has accumulated. They also can show up in crawl spaces, under chairs, in garbage can handles and under flower pots, eaves and porch railings.

"These spiders are shy and are less likely than black widows to bite humans," Ring said. "Nevertheless, they can bite when they come in contact with a person’s skin."

Ring suggests wearing gloves, long-sleeved shirts and long pants when working outdoors, especially in areas that don’t get a lot of human activity.

In addition to recognizing the spiders themselves, Ring points out that the egg sac of the brown widow is different from that of the black widow. The white-to-tan-colored egg sac of the brown widow is lumpy. The black widow’s egg sac is smooth. The egg sac can be found attached to the web and is about one-half inch in diameter.

The best remedy for controlling brown widow spiders is to remove areas where they may nest, according to Ring. The LSU AgCenter entomologist recommends picking up clutter and sealing cracks and crevices around doors and windows, as well as in driveways and sidewalks.

Ring added that brown widow spiders also can be controlled by using spray or powdered insecticides labeled for spiders.


Story Source:

The above story is based on materials provided by LSU Agricultural Center. Note: Materials may be edited for content and length.


Cite This Page:

LSU Agricultural Center. "Venomous Brown Widow Spiders Making Themselves Known In Louisiana." ScienceDaily. ScienceDaily, 13 May 2007. <www.sciencedaily.com/releases/2007/05/070510083028.htm>.
LSU Agricultural Center. (2007, May 13). Venomous Brown Widow Spiders Making Themselves Known In Louisiana. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2007/05/070510083028.htm
LSU Agricultural Center. "Venomous Brown Widow Spiders Making Themselves Known In Louisiana." ScienceDaily. www.sciencedaily.com/releases/2007/05/070510083028.htm (accessed July 30, 2014).

Share This




More Plants & Animals News

Wednesday, July 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Thousands Flocking to German Crop Circle

Raw: Thousands Flocking to German Crop Circle

AP (July 30, 2014) Thousands of people are trekking to a Bavarian farmer's field to check out a mysterious set of crop circles. (July 30) Video provided by AP
Powered by NewsLook.com
Concern Grows Over Worsening Ebola Crisis

Concern Grows Over Worsening Ebola Crisis

AFP (July 30, 2014) Pan-African airline ASKY has suspended all flights to and from the capitals of Liberia and Sierra Leone amid the worsening Ebola health crisis, which has so far caused 672 deaths in Guinea, Liberia and Sierra Leone. Duration: 00:43 Video provided by AFP
Powered by NewsLook.com
At Least 20 Chikungunya Cases in New Jersey

At Least 20 Chikungunya Cases in New Jersey

AP (July 30, 2014) At least 20 New Jersey residents have tested positive for chikungunya, a mosquito-borne virus that has spread through the Caribbean. (July 30) Video provided by AP
Powered by NewsLook.com
Raw: Otters Enjoy Water Slides at Japan Zoo

Raw: Otters Enjoy Water Slides at Japan Zoo

AP (July 30, 2014) River otters were hitting the water slides to beat the summer heatwave on Wednesday at Ichikawa City's Zoological and Botanical Garden. (July 30) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins