Republished from WSU News

Raspberries growing on canes.
Early fruiting with good yield and flavor, firm fruit, good root rot tolerance, and machine harvestable, WSU’s newest raspberry cultivar is named Cascade Premier.

Bright, flavorful, and bred for easy automated harvest, Washington State University’s new red raspberry variety, “Cascade Premier,” is more than a decade in the making.

First crossed in 2007 from two WSU experimental varieties, and released to growers in 2018, the new variety has continually shown promise in its bounty, disease resistance and growing qualities.

Now in its debut year, Cascade Premier’s first full harvest is expected in summer 2021.

Of the 10 raspberry varieties that Puyallup-based small fruit breeder Patrick Moore has released in his 31 years at WSU, “this is one of the best,” he said.

“It’s unusual to get something that’s this flavorful, firm, colorful, easy releasing, and resistant to disease,” Moore added. “This one hits all the sweet spots.”

Bred for Northwest growers

Rich in fiber and vitamin C, raspberries are a “superfood,” offering folate, magnesium, potassium, calcium, niacin, vitamin B6, phosphorus, and zinc.

Patrick Moore head shot
Patrick Moore, WSU Small Fruit Breeder.

The number-two state for raspberry production, Washington grows about 80 percent of the nation’s processed red raspberries for treats like smoothies, jams and pies.

With most of the state’s crop going to the frozen, processed market, the WSU breeding program concentrates on processed raspberry production.

“The ability to machine-harvest raspberries is essential to the Washington processing industry,” Moore said.

Growers use special machines to shake berries off canes at harvest, so berries need to release at the right moment.

“We don’t want them to come off too early, when they’re not ripe enough, or late, when they’re soft and overripe,” said Moore.

Cascade Premier’s berries release easily at the right time, allowing growers to harvest firm berries instead of mushed fruit. The new variety also grows its fruit-bearing branches to a uniform length, reducing damage to the canes from harvest and ensuring better yields.

Cascade Premier also ripens earlier in the berry season compared to the dominant variety. That lets growers lengthen their berry season, increasing availability for customers.

In appearance, Cascade Premier is lighter and brighter than the popular Meeker cultivar, and its chemistry is similar to Willamette, another older, popular raspberry.

“It’s a little bit tart, with good sugar levels and well-balanced flavors,” said Moore. “It’s a good-looking, good-tasting berry.”

Cascade Premier raspberries rolling off a machine harvester.

Breeding for processing raspberries is different from breeding from the fresh market, requiring bolder colored fruit with intense flavor and a shorter harvest season. For fresh markets, the objective is a lighter colored fruit that is hand-harvested during a longer harvest season.

“Cascade Premier has characteristics that allow it to be used for either processing or fresh—large firm fruit with excellent flavor that picks easily either machine or hand harvested,” Moore said.

Resistant to a cane-killing disease

The Northwest crop has long been dominated by Meeker, a 1967 WSU variety. Moore has been working to give farmers updated varieties that can resist root rot, a relentless, soilborne fungal disease.

“Once you’ve got root rot in your soil, it stays there,” said Moore.

Root rot wilts and eventually kills all of your canes, and there are no effective treatments beyond seeking virgin soil, or breeding canes that can resist the rot.

Grown at fields in Puyallup known to harbor the root rot pathogen, Cascade Premier held up well to the disease.

Tested in Washington, Oregon and British Columbia, this new berry grows well throughout the Pacific Northwest, and it came out in the top 10 percent of tested varieties for yields several years running.

For years, Moore has followed a two-word convention when it comes to naming his berries. The first name is always “Puget” for strawberries, “Cascade” for raspberries.

“That helps people know they’re from WSU,” he said.

Since these berries stood out so strongly from the pack, he dubbed them “Premier.”

“There aren’t a lot of cultivars that are early fruiting with good yield and flavor, firm fruit, good root rot tolerance, and are machine harvestable,” Moore said.

“With all that it brings to the table, I believe this berry will do very well in the Pacific Northwest.”