Brown rot surprises cherry growers

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

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  • Ready for drosophila

Ready for drosophila

  • March 1st, 2011

Spotted wing drosophila larvae that hatch from eggs inside the fruit sometimes pop out and walk around on the surface. The spotted wing drosophila can pupate inside the cherry, outside the cherry, or halfway out.
PHOTOS BY ELIZABETH BEERS, WASHIHINGTON STATE UNIVERSITY

The Washington tree fruit industry should be better [...]

  • A primer on Botrytis cinerea

A primer on Botrytis cinerea

  • March 1st, 2011

Dr. Wayne Wilcox of Cornell University says Botrytis cinerea as a weak pathogen that prefers injured, senescent tissue, such as old blossom parts and ripening fruit. The more ripe the fruit, the more susceptible it becomes, an added consideration when rains delay harvest.

Botrytis thrives where there’s low evaporative water [...]

  • Bunch rot strategy for 2011

Bunch rot strategy for 2011

  • March 1st, 2011

PHOTO COURTESY OF CORNELL UNIVERSITY

For Washington grape growers who had a bunch rot problem in 2010, efforts to get rid of any carryover crop are worthwhile, says a New York plant pathologist. Growers should also be prepared to spray a botrytis-specific fungicide during bloom, if weather conditions are favorable [...]

  • Botrytis comes to dry Washington

Botrytis comes to dry Washington

  • March 1st, 2011

Latent infections inside a cluster can take over the bunch by harvest time.
PHOTO COURTESY OF CORNELL UNIVERSITY

Last year’s cool season not only challenged growers and winemakers with slow fruit ripening, it also brought bunch rot to some vineyards, causing significant damage from a lack of disease awareness.

The 2010 [...]

  • Will the new pest go after grapes?

Will the new pest go after grapes?

  • March 1st, 2011

Grape growers learn to identify spotted wing drosophila at a Washington State Grape Society meeting.
Photo by Melissa Hansen

Preliminary tests conducted last fall indicate that Washington State grapes might not be attractive to the spotted wing drosophila, an invasive new pest that has popped up across much of U.S. [...]

  • 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. [...]

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 [...]