Black widows are sluggish and usually not aggressive.
“They are not extremely fast. They are web spiders, so they are not exactly built for speed,” Grantham said.
Black widows don't walk well, but they can move more quickly in their own web. People should remember to keep their hands out of places they can't see, he said.
“Underneath an eave or inside shrubbery, you will find black widow webs,” Grantham said.
Micah Anderson, who coordinates an irrigated crop program for small farmers for the state Department of Agriculture, Food and Forestry, said he spots black widows in numbers hiding under watermelons and under plastic used for the irrigation systems in fields.
One day along the North Canadian River near Prague, he found himself surrounded while picking up watermelons.
“I've never seen so many,” Anderson said. “I have to roll the watermelons over and look before I pick them up.”
Around the house
Black widows don't often venture indoors, but it can happen.
More of the spiders are being spotted around homes in central Oklahoma this summer, said Ray Ridlen, Oklahoma State University extension agent.
In times of drought, the hearty black widows come closer to buildings and come indoors looking for bugs to prey on. Crickets are one of their staples, Ridlen said.
Black widows are known for the oily black body with the orange hourglass shaped spot. But young and maturing black widows have various molts that change their appearances, he said. Some have a mottled black and white pattern. Sometimes the orange spot is in a different place.
Schaeffer said the black widow is highly venomous, and the antivenin also can cause severe allergic reactions. People should go to the emergency room if they have trouble breathing.
“The pain becomes incredible,” Schaeffer said. “The venom is so powerful it can cause a lot of pain.”
Shaeffer said he expects his staff will continue fielding calls this year, and he will watch where he puts his own hands.
“I am certainly more aware of them now,” Schaeffer said.