Pat Bates had a mystery tree on her Glendale property that produced tasty orange fruit. Since it was a resale home, she didn't know what type of citrus it was.

So she brought it with her Saturday to the Master Gardener's West Valley Citrus and Fruit clinic at the University of Arizona Citrus Agricultural Center in Waddell.

Glenn Wright, associate research scientist and Arizona citrus specialist with the University of Arizona's Yuma Agricultural Center, took a look at the fruit.

It could be an Orlando tangelo, he said, based on the leaves.

"We have given the fruit away to friends and no one could tell us what it was, except it was similar to a Mandarin," Bates said.

Wright led the citrus variety clinic, teaching attendees about a few dozen citrus varieties from kumquats to grapefruits, oranges, lemons and limes.

Valencias are the best quality oranges for juice, he said.

"And if you have a tree that you are just now able to eat the oranges, you have a Valencia," Wright said.

Mineola tangelos are produced from the crossing of a tangerine and a grapefruit.

"Those are extremely juicy," Wright said. "You should strip down to your underwear and eat them in the shower."

Bates said she was attending the clinic for the first time, but her husband Roy visited last year and learned a lot. He was attending a different clinic.

"We have several citrus trees, and he wants to learn about grafting and irrigation," Bates said.

Besides the citrus session, there were other clinics on citrus irrigation, pruning and budding, pest control, citrus diseases, fertilization practices and date growing.

Sam Pryfogle, master gardener and volunteer coordinator for the event, said the citrus clinics are once a year and a big hit with area residents.

"These clinics are geared for the backyard gardener because a lot of people have citrus trees in their yard," he said. "We educate them on how to grow them and what to look for as far as problems they may have."

Pryfogle said about 175 people were schedule to attend the event.

Pest control, the citrus variety table and fertilization were among the top draws.

"You should fertilize at least three times a year," he said. "And too much water is bad. You should only water once every 10 to 15 days in the summer and about once a month in the winter."

Russ LeBarron of Sun City West attended the clinic for the second year.

His wife, Carlisle, came along Saturday because Russ "was so enthusiastic after attending last year," she said.

LeBarron said he was back to refine his knowledge and to learn more for when the couple replaces existing, 30-year-old trees on their property.

"Last year I bought a Trovita orange after attending the clinic," he said. "And our grapefruit tree is looking better."