is part of the Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

  • American Agriculturist
  • Beef Producer
  • Corn and Soybean Digest
  • Dakota Farmer
  • Delta Farm Press
  • Farm Futures
  • Farm Industry news
  • Indiana Prairie Farmer
  • Kansas Farmer
  • Michigan Farmer
  • Missouri Ruralist
  • Nebraska Farmer
  • Ohio Farmer
  • Prairie Farmer
  • Southeast Farm Press
  • Southwest Farm Press
  • The Farmer
  • Wallaces Farmer
  • Western Farm Press
  • Western Farmer Stockman
  • Wisconsin Agriculturist

Three-day thrips workshop at UC Davis funded by biosecurity grant

— A three-day workshop on thrips, tiny winged insects that cause so much damage to flower and vegetable crops that they can pose a biosecurity threat, is scheduled Oct. 15-17 in the Harry Laidlaw Jr. Honey Bee Research Facility, University of California, Davis.

The workshop is funded by a biosecurity grant from the U.S. Department of Agriculture (USDA), awarded to two UC Davis entomologists—grant writer Cheryle O’Donnell and principal investigator Michael Parrella — and thrips biologist Gerald Moritz of the Martin-Luther University Halle-Wittenberg, Halle, Germany.

“Thrips cause billions of damage to our agricultural crops in the United States,” said O’Donnell, the workshop coordinator. Thrips puncture and suck nutrients from plants and also feed on other insects and mites.

In 1996, Cuba’s Fidel Castro accused the United States of aerially releasing Thrips palmi over potato fields.

“Of the more than 5000 species of thrips known in the world, some are serious pests, and some are beneficial as pollinators and predators,” said O’Donnell, who has studied thrips since 1997 and recently completed her doctorate in entomology from UC Davis. Some thrips transmit plant diseases, such as the tomato spotted wilt virus and the Impatients necrotic spot viruses.

“To monitor agricultural crops effectively, it’s important to be able to identify them, but it’s difficult to do so without understanding thrips taxonomy and identification,” she said.

The Thysanoptera Workshop (thrips belong to the scientific classification order, Thysanoptera) is geared toward agricultural identification inspectors at ports of entry, Extension specialists, general entomology diagnosticians and graduate students focusing on thrips or taxonomy.

O’Donnell, Parrella and Moritz and UC Davis entomologist Diane Ullman will be among the speakers at the workshop, along with USDA and California Department of Agriculture scientists and other specialists. Topics include the biology, ecology and identification and exotic species of concern to the United States; and USDA exotic pest interceptions.

“Thrips are so small — one millimeter long or less — that they’re like a speck,” O’Donnell said. “Inspectors see larvae, eggs and adults on plant material coming in, but unfortunately, the identification keys are built for the adult female. There are no distinctive morphological characteristics available to separate species at the life stage of eggs, larvae and adult males.”

“That’s why molecular information is a must to determine the species of individuals, especially those intercepted at ports of entry,” said O’Donnell, who works in the Parrella lab and also identifies thrips for the Bohart Museum of Entomology on the UC Davis campus.

The team will train diagnosticians on collecting, preparing the collection for molecular identification, and slide mounting. Training also will include identifying thrips using Lucid keys, a software management tool.

Enrollment is limited to 30 participants. Registration is $550. Only six slots remain, with registration closing Friday, Oct. 12.

For more information, e-mail O’Donnell at or phone (530) 752-4784); access the online workshop at; or access her interactive thrips identification tool at, her master’s thesis.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.