Posts Tagged: wasp
If you're trying to fuse art with science and want to draw a wasp on a penny-farthing, but the legs are too short to reach the pedals, there's only...
Stacey Rice of the Larry Godfrey lab, UC Davis Department of Entomology and Nematology, wearing the winning t-shirt she desinged. (Photo by Kathy Keatley Garvey)
What's it like to be parasitized? Say you're a caterpillar or an aphid and a wasp comes along and lays her eggs inside you. Her eggs will hatch and...
A wasp (family Aphidiinae) parasitizing an aphid. (Photo by Fran Keller, who received her doctorate in entomology this year from UC Davis.)
Ants can be a huge nuisance in and outside our homes, particularly if you have food lying around. But now, it turns out, they’re unwelcome, too, on citrus trees.
A year ago, UC Riverside entomologists released Tamarixia, a parasitoid wasp and natural enemy of the Asian citrus psyllid (ACP) imported from Pakistan, into a biocontrol grove in Riverside, Calif. Tamarixia can serve as an excellent biocontrol agent against ACP, a citrus pest first detected in 2008 in Southern California that is capable of spreading citrus greening disease, or Huanglongbing.
Female Tamarixia can kill psyllids also by “host-feeding.” They use their ovipositors as daggers to stab psyllid nymphs numerous times until the nymphs start to bleed. As bodily fluids ooze out of the nymph, Tamarixia sucks up this rich protein needed for developing more eggs.
An excellent way then to control ACP populations! Yes, but only until the ants come marching in. Argentine ants are threatening to disrupt the biocontrol of ACP by battling it out with Tamarixia on citrus branches. While not quite a Vader-Skywalker lightsaber duel on a precarious walkway, an “invasive meltdown” begins when the ants gang up to protect the nymphs.
“ACP nymphs produce a white, sugary waste product called honeydew, a good carbohydrate source for the ants,” explains Mark Hoddle, the director of the Center for Invasive Species Research at UC Riverside, whose research team has released Tamarixia into several Southern California citrus groves. “The ants, therefore, will protect the nymphs from Tamarixia. We have seen ants chase female Tamarixia off the psyllids, and even catch and eat them!”
“If you kill off the ants, Tamarixia can play the role of the biocontrol agent it was cast to do on citrus trees,” Hoddle says. “We’re seeing that the ants are impacting Tamarixia in two ways: they are preventing Tamarixia’s establishment in some areas; and, where Tamarixia is already established, the ants are not allowing these parasitoids to reach their full biocontrol potential.”
We saw her touch down in our nectarine tree last weekend. Big green compound eyes glowed at us. She moved up and down a branch, foraging for food,...
Green-eyed wasp, genus Tachytes, in a nectarine tree. This one is a female, as identified by Lynn Kimsey, director of the Bohart Museum of Entomology.(Photo by Kathy Keatley Garvey)
Green-eyed wasp, Tachytes sp., foraging on a nectarine tree. (Photo by Kathy Keatley Garvey)
A little somersault by a green-eyed wasp, genus Tachytes. (Photo by Kathy Keatley Garvey)
Do you brake for wasps? We spotted a bumper sticker on the UC Davis campus the other day that read: "I brake for wasps." It was parked in the...
Solitary vespid foraging on Indian hawthorn at the Benicia marina. (Photo by Kathy Keatley Garvey)
Upside down, a solitary vespid checks out its surroundings. (Photo by Kathy Keatley Garvey)
And away it goes. (Photo by Kathy Keatley Garvey)