Spiders Spiders Everywhere Theres a new venomous spider

Spiders, Spiders Everywhere There’s a new venomous spider to watch out for!

http: //pep. wsu. edu/pdf/PLS 116_1. pdf Case Report #1 • • • 56 year old woman feels bite on thigh Nausea, migraine-like headache In few days, necrotic tissue sloughs off 2 weeks later she seeks medical attention Bleeding from nose, ears, etc. Information taken from an article written by Gordon Grice, September 2005, Bite of the Hobo Spider. Is it arachnophobia or are people dying? DISCOVER Vol. 26 No. 09.

Was it a spider that made her sick? Darwin Vest, toxinologist v The first to investigate the cause of the lesions. v He collected spiders from houses where humans had developed lesions or had symptoms similar to the woman who died. v He collected the venom and placed it on the backs of rabbits. The rabbits developed lesions just like those he had seen on humans. Hobo spiders could, in fact, cause necrotic lesions.

http: //pep. wsu. edu/pdf/PLS 116_1. pdf Prime Suspect • • • Hobo Spider Genus, species: Tegenaria agrestis Family: Agelenidae Nicknamed: “mat weaver” Common in Europe, entered US in the 1930 s, attached egg sacs to shipments

http: //pep. wsu. edu/pdf/PLS 116_1. pdf Hobo Spider Symptoms: Blistering wound ringed with yellow (moon in a halo of smog) Headaches Disturbed thinking (rare) Image of a finger with a wound caused by the Hobo spider…OUCH!! http: //egov. oregon. gov/ODA/PLANT/ippm_spider. shtml

http: //www. washington. edu/burkemuseum/spid ermyth/myths/insidewolf. html# Giant House Spider HELPFUL to humans The Hobo spider’s cousin Preys on the Hobo spider LARGE HAIRY SPIDER DOES NOT EQUAL WOLF SPIDER GHS commonly mistaken for a Wolf spider. Classification based on arrangement of eyes.

Yellow Sac Spider http: //lancaster. unl. edu/enviro/pest/Articles/Yellow. Sac Spiders. htm Symptoms: Stinging sensation Red sores with white pustules Bite may blister and break May feel mildly sick

Mexican Red Knee Tarantula http: //www. museum. vic. gov. au/spidersparlour/tarant 2. htm Symptoms: Venom is relatively harmless to humans. The bite is similar to a bee or wasp sting. If their hairs poke your skin, they can cause a rash, redness and itchiness. Allergic reactions are unusual.

http: //www. usq. edu. au/spider/find/spiders/507. htm White-tailed Spider Symptoms: Burning pain Swelling Itchiness 4 days after bite http: //www. avru. unimelb. edu. au/avruweb/wtspage. htm

Black Widow Symptoms: Painful bite Painful rigid abdomen Severe diffuse muscle pain Excessive salivation Sweating Nausea/vomiting Difficulty breathing Headaches Weakness http: //muextension. missouri. edu/explore/wildthing/ images/blackwidow. jpg

Brown Recluse Symptoms: Necrotic lesions Dizziness Fever Chills Rash Vomiting http: //www. uky. edu/Agriculture/Entomology/entfa cts/struct/ef 631. htm Spider bite http: //www. lib. uiowa. edu/hardin/md/brownrecluse. html http: //www. uky. edu/Agriculture/Entomology/entf acts/struct/ef 631. htm Bacterial Infection

Where Do They Call Home? Hobo Spider Brown Recluse Other Recluses Map adapted from the following website: http: //www. uky. edu/Agriculture/Entomology/entfacts/struct/ef 631. htm

Where Do They Call Home? Tarantulas Black Widow Yellow Sac Spider Map adapted from the following website: http: //www. uky. edu/Agriculture/Entomology/entfacts/struct/ef 631. htm

What are the most dangerous spiders in the world? Redback Spider Black Widows Redback spider http: //faunanet. gov. au/wos/factfile. cfm? Fact_ID=82 Black Widow http: //muextension. missouri. edu/explore/wildthing/images/blackwidow. jpg

What are the most dangerous spiders in the world? Funnel-web spiders Funnel-Web Spiders http: //www. avru. unimelb. edu. au/avruweb/Fws. htm

What are the most dangerous spiders in the world? Recluse Spiders Brown Recluse http: //www. uky. edu/Agriculture/Entomology/entfacts/struct/ef 631. htm

What are the most dangerous spiders in the world? Banana Spiders Banana Spider http: //www. rochedalss. qld. edu. au/wandering. htm

Are daddy long legs the deadliest spider? Nah, that is a myth! This myth may have been started because daddy long legs actually prey one of the more dangerous spiders, the Australian Redback Spider. http: //spiders. ucr. edu/images/holplu 1. jpeg

How should you protect yourself? • Shake out clothes and shoes before putting them on. • Inspect bedding (sheets/pillow cases) before using. • Bedspreads and bedskirts are potential risks – contact with the floor. • Be careful around woodpiles, rock piles, etc. • Pesticides should be a last resort or if there is a heavy infestation.

Questions? • Why is it difficult for a doctor to correctly diagnose spider bites? • Why do you think it would be unwise to use pesticides for spider control?

Questions? • Why is it difficult for a doctor to correctly diagnose spider bites? – They oftentimes look like another disease such as a rash, bacterial infection, or even diseases like diabetes. • Why do you think it would be unwise to use pesticides for spider control? – You kill not only the bad spiders, but you also take out a natural predator of the bad spider (wolf spiders, giant house spiders do a great job of keeping insect populations and spider populations in check.