About poisonous spider "redback spider" Print this page

The last update date:
April 1, 2019

◆Being careful! ◆Redback spider latest information

◆In Miho, Shimizu-ku district, redback spider is confirmed!◆

 Report added to thing which there was when there was report that we discovered one spider thought to be "redback spider" of poisonousness in specific foreign living things by farmland close to Shimizu fifth Junior High School in Miho, Shimizu-ku on August 15, 2018, and city officials performed field work and further confirmed one living body of spider and egg nou (bag which egg entered) six.
 When it was redback spider, discovered individual was confirmed by expert.

 After reexamining discovery point on 16th, the following day, three living bodies of spider and egg nou 17 were discovered newly.

 We performed check disinfectant work in Shimizu fifth Junior High School, seisuisanhodaiichishogakuko of neighborhood, seisuisanho child institution on August 17, and one living body, egg nou two were discovered in Shimizu fifth Junior High School.

When it was all redback spider, individual discovered on August 16 and 17th was confirmed by expert.

 Redback spider which was discovered on August 15, 2018


 Egg nou (bag which egg entered) of redback spider
 
 As for the redback spider confirmed so far, the living body becomes six of them, egg nouga 25.
 Discovered redback spider is killed all by insecticide. In addition, city officials performed sterilization, prevention by dispersion of insecticide after investigation around discovery place.


 We may not attack from redback spider positively, but may be bitten when we touch. Female has poison, and local pain, heat, itch accrue when bitten.
 Symptom is reduced in a few days from several hours, but may be rarely almost aggravated.

 
 Please get rid for spraying insecticide to catch barehanded when you see flyers of city and Ministry of the Environment making and discover redback spider, and to be careful not to touch, and to crush with newspaper and slippers.

 ●Shizuoka-shi making flyer: We are careful about redback spiders! (PDF file)
 
 ●Ministry of the Environment making flyer: Flyer (PDF file) of redback spider haiirogokegumo


Contact information to city is as follows.

[when we discover spider thought to be redback spider]
 Person in charge of environmental creation section nature contact
 TEL: 221-1319
 FAX: 221-1492

[when we have been bitten by spider thought to be (redback spider about consultation of medical institution)]
 Person in charge of Sanitary Affairs Division medical care safety measures
 TEL: 249-3159
 FAX: 209-0540

Redback spider
Redback spider and egg nou (offer: Shizuoka natural history Museum network)
(we increase when we click ※)

Redback spider haiirogokegumo
The left: The redback spider right: haiirogokegumo (we reprint than Ministry of the Environment, collection of foreign living thing photographs)
 

Conventional discovery information

◆Redback spider was confirmed in Shizuoka-shi on April 23, 2018!◆

 On Saturday, April 21, 2018, spider thought to be "redback spider" was captured in material place in office site in Shizuoka-shi.
 After staff of Shizuoka-shi environment creation section collecting individual from the company in response to report after checking the spot on Monday, April 23, the same year, and asking for confirmation in Shizuoka nature Social Welfare Section, it was settled when it was redback spider.
Redback spider 300423
 It has been already killed only in 1 individual what was discovered this time.
 In addition, prevention by dispersion of insecticide has been carried out after on-site confirmation staff of Shizuoka-shi environment creation section around discovery place.


◆Redback spider was discovered again in Shizuoka-shi on June 30, 2016!◆

 It was settled when staff of Shizuoka-shi asked for confirmation in Shizuoka nature Social Welfare Section in response to report that we discovered six spiders thought to be "redback spider" in Shin-Tomei Expressway NEOPASA Shimizu (descent) of Kogochi, Shimizu-ku on Thursday, June 30, 2016 after checking the spot when it was redback spider.
Redback spider 280630
 About discovered individual, we are got all rid.


◆Redback spider was discovered for the first time in Shizuoka-shi on June 7, 2016!◆

 After spider thought to be poisonous spider "redback spider" of specific foreign uncooked food being discovered in Shin-Tomei Expressway NEOPASA Shimizu (the up) of Kogochi, Shimizu-ku on Tuesday, June 7, 2016, and confirming in Shizuoka nature Social Welfare Section, it was settled when it was "redback spider".
 In Shizuoka-shi, it becomes the first discovery example.

20160607 redback spider (1) 20160607 redback spider (2)
 Redback spider which was discovered
 ※These capita have been already got rid of.


 We had newspaper report that one spider similar to redback spider was discovered in private house of Shintomi-cho, Aoi-ku by inhabitants on Saturday, September 28, 2013. The real thing was not confirmed, but might be redback spider.

About life of gokegumo

(1) Characteristic  
・Redback spider … The length is belt-shaped design that is red black at back in about 1cm, the whole  
・haiirogokegumo… Is gray as for the length in about 1cm, the back and black; vary, and have spot   
(both spiders have red hourglass-shaped spot to abdominal ventral)

(2) Habitation place  
・Place that is sunny, and has abundant bait such as insect or small animal  
・We make irregular nest with the back of the side and cover of drainage, draining off pipe, relationship of planter

(3) Habit  
・We may not be bitten unless there is not the aggressiveness and touches barehanded

(4) Prevention method  
・We can kill insects by atomizing commercial home insecticide (pyrethroid system insecticide)  
・Please wear rubber gloves if you work the outdoors including care for cleaning and flower bed

(we quote from Fukuoka-shi homepage)

Contact information to city is as follows.
[when we discover spider thought to be redback spider]
 Person in charge of environmental creation section nature contact
 TEL: 221-1319
 FAX: 221-1492

About damage of gokegumo

(1) Symptom when we were bitten  
・Was made to stab with needle in most cases if was bitten; is painful, and occur in point bitten by for thing and erythema to feel for a feeling of heat  
・Symptom is reduced in a few days from several hours, but whole body symptoms such as loss of strength, headache, muscular pain, sleeplessness may sometimes usually continue for several weeks  
・If hand and foot are chewed, we produce pain that is strong in the chest, the abdomen and whole body and we may raise convulsions and may be accompanied by sweat, nausea, high blood pressure, breathing disorder  
・As children and elderly person might come to have heavy symptom, attention is necessary

(2) When we are bitten  
・Please consult with medical institution immediately if we are bitten  
・When it is aggravated, treatment with antitoxin is necessary  
・Please bring spider which you killed to hospital to know type of spider which bit if possible

(3) Bite example  
・gokegumo does not have the aggressiveness, but may be bitten when we touch  
・Bite example in Japan is reported mainly for from June to October  
・Bite example of redback spider is reported in Japan and most are mild, but may be aggravated  
・There is not example which died of harm of redback spider in Japan, but dead person appears in Australia (there is not the death example after serum development) 
(we quote than Fukuoka-shi homepage and Ministry of the Environment brochure)

Contact information to city is as follows.
[when we have been bitten by spider thought to be (redback spider about consultation of medical institution)]
 Person in charge of Sanitary Affairs Division medical care safety measures
 TEL: 249-3159
 FAX: 209-0540

With naturalized species

Originally, with naturalized species, we point to creature brought into country and area that there was not by human activity.
It is said that there are 2000 or more kinds of naturalized species only with thing brought in from foreign territory in Japan. Plant, fishing for pet and admiration, thing brought in for food and thing which sticks to supplies, and entered all too soon are included in this.

Among naturalized species, we appoint to "identification outpatient department living thing" by the foreign uncooked food method about thing that ecosystem, agriculture, forestry and fisheries industry, damage to human life, body are heavy and prohibit what we give off in breeding, cultivation, transportation, storage, import, sale, outdoors.

Red spider of stomach? (common inquiry introduction)

 It is red creature of the following stomachs that we can see two kinds in Shizuoka-shi.  "There was spider that stomach is red, but may be redback spider"   It is not following two kinds or asks you to confirm before having information approach. (1) Yokozuna assassin bug  In family of harlequin bug, the length is around 2cm. Color of the body is black with luster, and bright red exits in stomach. It inhabits at the tree tree trunk outskirts.  (we may stab people to sting insect, and to absorb body fluid.) Yokozuna assassin bug Yokozuna assassin bug Yokozuna assassin bug (offer: Shizuoka natural history Museum network) ※We increase when we click (2) Silk spider  In family of spider, the length is around 2-3cm in females. The mature female abdomen has yellow and copper green rust-colored lateral stripe design, and florid crest appears on the abdominal undersurface. Leg is yellow lateral stripe design, too.  We put big net on tree or building. Silk spider Silk spider Silk spider (offer: Shizuoka natural history Museum network) ※We increase when we click

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Reference about this page

Person in charge of environmental station environment creation section nature contact

The location: Shizuoka government building the thirteenth floor of the new building

Telephone: 054-221-1319

Fax: 054-221-1492

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