Brown rot surprises cherry growers

Tart cherry growers need to watch out for European brown rot as bloom arrives.

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  • Cougarblight model updated

Cougarblight model updated

  • March 1st, 2011

Washington State University is working to help growers be better prepared to fight fireblight.

Washington State University’s Cougarblight model is being updated to improve its ability to predict when conditions are conducive to fireblight.

The model uses information on temperature, wetness, and presence of fireblight bacteria to predict infections and was [...]

  • Sap beetles attacked Michigan cherries

Sap beetles attacked Michigan cherries

  • March 1st, 2011

The strawberry sap beetle was one of three species identified in cherry orchards. The other two were dusky and picnic sap beetles.
Photo by Stephen Luk

Cherry growers around Traverse City, Michigan, were plagued last season by an unusual attack of sap beetles. Three species of them were found, all [...]

  • Obliquebanded leafroller bugs tart cherry growers

Obliquebanded leafroller bugs tart cherry growers

  • March 1st, 2011

Leafroller larvae form webs and use them to curl leaves into protective structures.
Photo Courtesy Of Washington State University

Obliquebanded leafroller has been increasing as a problem in tart cherries in recent years, where the black-headed green larvae are a highly undesirable contaminant at harvest time in July.

Entomologist Dr. Nikki [...]

  • Stinkbugs on the move

Stinkbugs on the move

  • March 1st, 2011

Adult brown marmorated stinkbugs feed on ripe peaches, a preferred fruit.

A monitoring trap in a commercial apple orchard drew large numbers of bugs. Some traps attracted 2,000 bugs.

The brown marmorated stinkbug, Halyomorpha halys, is rapidly becoming more than a nuisance, a curiosity, and a bug with a funny name. [...]

  • Researchers tackle apple weevil

Researchers tackle apple weevil

  • March 1st, 2011

Small and black, the apple flea weevil looks a bit like its larger snout beetle relative, the plum curculio.
Photo by matt grieshop, michigan state university

A coalition of partners in four Midwestern states has applied for grant funding to respond to three new insect threats—spotted wing drosophila, brown marmorated [...]

Tackling scab resistance

  • February 15th, 2011

Apple growers in the Midwest who stuck by the “old ways” of applying fungicides have not faced the problem of apple scab becoming resistant to fungicides. The old ways employed protectant fungicides like captan and ­mancozeb; the new ways used curative chemistries.

Now what should growers do? Dr. Janna Beckerman, [...]

Scab-resistant varieties need protection, too

  • February 15th, 2011

When apple breeders in New Jersey, Indiana, and Illinois came together in 1926 to form the Purdue-Rutgers-Illinois university collaboration called PRI, their ­number-one goal was to create new apple varieties that were scab resistant.

They did it, too, and about 20 resistant varieties have been released. While several varieties have [...]

  • Opportunistic fungi

Opportunistic fungi

  • February 15th, 2011

Disease organisms invade injured tissue and develop cankers that release spores. Some red strains of McIntosh are susceptible, for reasons unknown, to opportunistic diseases that kill branches.
Photos courtesy of george sundin, Michigan State University

Starting in 2006, an epidemic of sorts started in apple orchards in Michigan. It was [...]

Watch for crown gall and vine decline

  • February 15th, 2011

Vineyardists in the Pacific Northwest have been relatively lucky regarding the number of grape diseases they have to worry about. But recent experiences indicate that Washington growers should also watch for diseases associated with vine decline, and crown gall could again be a problem in the state.

In the mid-1990s, [...]

BUYER BEWARE: Certified may not be clean

  • February 15th, 2011

Recent Washington State grower experiences of finding disease in a vineyard planted with certified stock have highlighted the weaknesses of state plant health certification programs and the need for program improvement.

“We thought we had something clean, and we were going down the road thinking we had some nice, clean [...]

  • A program for scab control

A program for scab control

  • February 15th, 2011

Photos courtesy of kerik cox, cornell university

Growers producing apples in the cool, damp northeast quadrant of the United States need to take a step-by-careful-step approach to apple scab control—starting early and being meticulous—or they can be in for a long summer of expensive spraying and still lose part of [...]

Little cherries, little flavor

  • February 15th, 2011

The cool weather of 2010 highlighted a growing concern about little cherries showing up in some orchards. Follow-up testing by Washington State University confirmed that the trees were infected with a dreaded cherry disease that had not been found extensively in Washington before.

“The 2010 spring was very cool, and [...]