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Beth Grafton-Cardwell retires following illustrious 30-year career in citrus entomology

Beth Grafton-Cardwell
UC Cooperative Extension specialist Beth Grafton-Cardwell retires July 1, a hero in the battle against pests that threaten the livelihood of citrus growers in California, and a successful advocate for reducing use of broad spectrum pesticides.

Grafton-Cardwell – who holds a bachelor's degree in biology from UC Berkeley, a master's in entomology from Purdue University and a doctorate degree in entomology from Berkeley – was named the UC Riverside citrus entomology specialist for the San Joaquin Valley in 1990. Her initial focus was on helping growers reduce their use of harsh pesticides through careful pest monitoring, choice of selective pesticides and preservation of natural enemies.

Along with her staff, Grafton-Cardwell studied the release of predatory mites for control of thrips and mites, validated degree-day units and pheromone traps for citrus cutworm, determined the effects of insect growth regulators on vedalia beetle (a natural enemy of cottony cushion scale), studied the best use of more than 30 new insecticides and miticides, and monitored pesticide resistance of California red scale and citrus thrips.

“It has been a wonderful career full of interactions with colleagues, growers and pest control advisors who shaped the direction of my research,” Grafton-Cardwell said.

During the last decade of her career, pesticide use in citrus has increased once again because of three issues: The drought and increasing temperatures exacerbating pests, new treatments required for pests of export significance, and invasive pests, most importantly the Asian citrus psyllid that can spread the devastating bacterial disease huanglongbing.

“It has been very rewarding to help growers navigate these challenges,” she said. “We have innovative citrus growers in California and excellent scientists at UC. I have every confidence that they will be able meet these challenges and maintain a vibrant California citrus industry.”

In June 2006, Grafton-Cardwell was named director of the UC Lindcove Research and Extension Center in Exeter, a 175-acre facility that supports research projects on citrus breeding, horticulture and pest management. Last year, Grafton-Cardwell hosted the launch of a fundraising program to build an educational complex at Lindcove to be called the Ray Copeland Citrus Center.

“Expanding the capacity of the Lindcove REC to conduct research and extension programs has made the directorship a very rewarding experience,” she said.

In retirement, Grafton-Cardwell plans for frequent travel to visit her children and grandchildren in Missouri and Massachusetts, working with community organizations in the Visalia area and, as an emeritus specialist, writing up past research and assisting with Lindcove's fundraising campaign.

Posted on Wednesday, June 24, 2020 at 8:39 AM


Hello Dr. Cardwell. I am a Contra Costa Master Gardener who is passionate about educating the public and its gardeners. My primary interest is following advancements in science to combat Huanglongbing and the Asian Citrus Psyllid.  
Two years ago, I red about the advancements made by extracting a compound from Australian/New Zealand finger limes. At that time a contract was established with a company to investigate the most efficient ways to introduce this compound into citrus plants.  
Who or where can I go to get additional/current scientific information on advancements in combating HLB?

Posted by Robert James Archer on February 28, 2022 at 9:44 PM

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