Yes, they are poisonous.
Their bite is painful and is toxic. Its poison can cause flu-like symptoms and, in severe cases, liver damage - especially in young children or the elderly.
Luckily, they are very sensitive to insecticides and, therefore, easy to control.
Black widow, brown widow, and desert recluse.
If you are referring to Black Widow spiders that can be found on banana stalks; they can bite you and inject a toxic poison.
A daddy long legs is a very spindly and harmless spider. Black widow spiders, on the other hand, are thicker and extremely poisonous. People should avoid black widow spiders whenever possible.
The three species of widow spider (Western Black, Southern Black and the Brown Widow) are all established here in Hawaii. They are not indigenous, having found their way here most times in freight or fruit coming from California. They are normally shy spiders and will only bite if cornered and threatened - or if you go after the egg sac. Males tend to not bite as their mandibles are very small - it is the female of the species that should be watched out for.
Black widow spiders are carnivorous and primarily feed on insects such as flies, mosquitoes, beetles, and other spiders. They catch their prey by using their sticky webs to ensnare insects that get caught in them. Once trapped, the black widow spider will bite its prey and inject venom to immobilize and digest it before consuming it.
Black widow spiders can be identified by their shiny black bodies with a red hourglass-shaped mark on the underside of their abdomen. They are also known for their distinctive web patterns and venomous bite.
Black Widow spiders live mostly in New England, and some have been seen in other bordering states. Black Widow spider bites are not very common and if you get a bite, you will know, because the pain is excruciating. If you are sure that you have a Black Widow spider bite, you absolutely need medical attention by a doctor.
It can, if you dont treat the bite. Like many other spiders it has venom, and the venom is about as potent as a black widow's from experience. But if you can get to a hospital at a moderately quick speed, you'll be fine.
Dr. Jerry Balentine's quote: "The black widow is about a half-inch long and symptoms of bite include abdominal pain, ... The bites of very large spiders such as tarantulas can be painful." I think it would take a long time.
Thre is a species of False Widow spider called Steatoda grossa, native to the UK. It is often mistaken for the Black Widow spider, which is found only in North America. There has never been a death from a spider bite in the UK.
Some spiders, like the black widow have dangerous venom that can kill a dog, or even a human.
It may be a Black Widow spider. They are very poisonous and it is probably best not to approach it if you are unsure of the species. Black spiders have a distinctive red "hourglass" shape on its back.