- Author: Kathy Keatley Garvey
Yes! It's among dozens of fact sheets (mostly insects but some arachnids and other non-insects) posted on the Bohart Museum website. All can be accessed and downloaded at no charge.
Lynn Kimsey, director of the Bohart Museum and a UC Davis professor of entomology, writes the fact sheets, including this one, titled "Widow Spiders."
"Widows are large, distinctive spiders in the genus Latrodectus," Kimsey writes. The Latrodectus mactans or black widow is found throughout the world in warmer regions, while the brown widow, L. geometricus, is found in warmer parts of the United States, including California.
You'll find widow spiders in and around homes, garages, barns and other human-made structures in California. "They build a tough, messy-looking three dimensional web in or behind objects in secluded and protected locations," Kimsey relates.
"During the summer months they may also commonly be found outside under shrubs, and other garden plants, or near porch lights," she says. "These spiders are excellent at controlling insects, particularly flies and crickets. They do not particularly like feeding on cockroaches, but will do so when other insects are unavailable."
What most folks seem to want to know about them are the bites. How painful and toxic are they?
"All spiders have painful and sometimes dangerous neurotoxic bites, but often give dry bites, with no venom," Kimsey points out. "In fact these are the only spiders in the United States with neurotoxic venom. The bites cause extreme physical discomfort and illness for several days to a week and can only be treated symptomatically. Common symptoms include pain in the vicinity of the bite, muscle aches, severe abdominal pain, vomiting, muscular cramping, sweating, fever and head- ache. The bite location itself may go unnoticed."
"There is usually no swelling at the site of the bite, where a small necrotic lesion may form, which heals slowly over a period of weeks or months. Black widow bites are rarely life threatening but may be dangerous for small children or individuals with chronic health problems. There have been no deaths from the bite of this spider for decades. Black widow bites can be dangerous for pets and can be fatal to small dogs or cats."
Kimsey advises that control is not necessary "unless a black widow is in an area frequented by people, particularly children, or by pets. It is important to remember that these are very shy spiders and never bite unless physically threatened."
Noted spider authority Jason Bond, the Evert and Marion Schlinger Endowed Chair in Insect Systematics, UC Davis Department of Entomology and Nematology and his lab usually present a program at the Bohart Museum on spiders at least once a year or engage with folks at the open houses.
The Bohart Museum of Entomology, located in Room 1124 of the Academic Surge Building on Crocker Lane, UC Davis campus, is the home of nearly 8 million insect specimens, plus a live "petting zoo" (Madagascar hissing cockroaches, walking sticks and tarantulas) and a gift shop. The Bohart is temporarily closed due to the COVID-19 pandemic but the online gift shop is open, where you can find insect-themed t-shirts, hoodies, jewelry, posters, books, pens, and stuffed animal toys, as well as insect-collecting equipment.
- Author: Kathy Keatley Garvey
Remember the massive media frenzy earlier this year when "the murder hornet" became a household word? The media labeled it that, but let's call it AGH. It's a hornet, not some weaponized insect with super powers that belongs in a B-rated movie seen at a Saturday matinee. Drop the drink! Hold the popcorn!
The peer-reviewed publication is the work of two former UC Davis entomologists now with WSU: honey bee geneticist-researcher Susan Cobey, research associate, Department of Entomology, and Timothy Lawrence, associate professor and Island County Extension director (they are a husband-wife team), along with Michael Jensen, associate professor and Pend Oreille County Extension director.
The first four paragraphs zero in on what this is all about:
"The Asian giant hornet (AGH) or Japanese giant hornet, Vespa mandarinia, recently found in British Columbia, Canada, (B. C. Ministry of Agriculture 2019) and in Washington State (McGann 2019), poses a significant threat to European honey bee (EHB), Apis mellifera, colonies and is a public health issue. The AGH is the world's largest species of hornet (Figure 1; Ono et al. 2003), native to temperate and tropical low mountains and forests of eastern Asia (Matsuura 1991). It appears the hornet is well adapted to conditions in the Pacific Northwest.
"If this hornet becomes established, it will have a severe and damaging impact on the honey bee population, the beekeeping industry, the environment, public health, and the economy. It is critical that we identify, trap, and attempt to eliminate this new pest before it becomes established and widespread. Attempts to contain the spread and eradication of this invasive insect will be most effective by trapping queens during early spring before their nests become established. Another strategy is to locate and destroy nests prior to development of virgin queens and drones in the late summer and fall.
"It is critical that surveying and trapping occur before the fall reproductive and dispersal phase of the hornet. Beekeepers in the field are a crucial line of defense in locating, identifying, and trapping the hornets. Yet, everyone should be on the lookout and report any sightings to local authorities and the Washington State Department of Agriculture.
"Here, we will cover how the AGH will impact the honey bee, give the reader a better understanding of the hornet, outline precautions to take, and first aid if attacked by the hornet."
The fact sheet provides crucial information, including what the public and beekeepers need to know, how to trap the hornets, where to report sightings, and information about the life cycle, the stinger, avoidance, and first aid. It details the public health issue and defines "What is a hornet?"
We've heard folks argue that AGH is a "hornet, not a wasp." Noted hymenopterist Lynn Kimsey, director of the Bohart Museum of Entomology and professor of entomology at UC Davis, points out that hornets ARE wasps.
WSU Extension defines a hornet this way:
"A hornet is simply a large wasp. Generally, wasps of the class or genus known as Vespa are considered hornets. Interestingly, there are no true hornets (Vespa) native to North America. The European hornet (Vespa crabro) is well established in much of the eastern half of the United States. The European hornet is not a major threat to honey bees."
"Hornets are part of a large order of insects known as Hymenoptera that include bees, wasps, ants, and sawflies. Worldwide, there are more than 115,000 species belonging to the order Hymenoptera (Hunt and Toth 2017). Most of this group of insects are beneficial for pollination and pest control. There are two types of hornets, solitary and social (Lee et al. 2016). Solitary hornets hunt various insects and spiders. Their 'stinger' is primarily used to paralyze their prey. They often lay an egg on the immobilized victim, and when the egg hatches, the larvae consume the still-living host. Solitary wasps generally do not sting humans and usually are not aggressive unless provoked."
"Social wasps, on the other hand, do use their stingers to defend their nests and can be very aggressive and will readily sting. The most common social wasp in the United States is the yellowjacket. The four most common yellowjacket species in Washington are the western yellowjacket (Paravespula pensylvanica), the common yellowjacket (Paravespula vulgaris), the aerial yellowjacket (Dolichovespula arenaria), and the German yellowjacket (Paravespula germanica) (Berry and Mooney 1998; Landolt and Antonelli 2003)."
"The recently introduced Asian giant hornet (AGH) is also a social wasp. When foraging for food in spring, the AGH ;is not highly aggressive—unless its nest is disturbed. Late summer and fall, with the high demand for protein, they become very aggressive when attacking or occupying a honey bee colony."
AGH appeared in the news last month when the Washington State Department of Agriculture announced it had trapped aVespa mandarinia near Birch Bay in Whatcom County. It was trapped July 14 and identified during processing on July 29. "This was the first hornet to be detected in a trap, rather than found in the environment as the state's five previous confirmed sightings were," according to the news release.
"Because the number of Asian giant hornet workers increases as a colony develops, residents should be most likely to see an Asian giant hornet in August and September," the news release related. "If you think you have seen one, report it at agr.wa.gov/hornets. Provide as much detail as you can about what you saw and where. Also, include a photo if you can safely obtain one, and if you come across a dead specimen keep it for potential testing. You can visit WSDA's website at agr.wa.gov/hornets to learn more about Asian giant hornets. You can also submit questions the WSDA Pest Program at email@example.com or 1-800-443-6684."
At least we never saw a 64-point bold, all-capped, World War II-sized newspaper headline that screamed "MURDER HORNET TRAPPED!"
But some of the misidentifications of Vespa mandarinia flowing in are incredible. Check out Stephane de Greef's Facebook page on "Is This a Murder Hornet?" The latest one spotlighted is a...wait for it...beetle.