Brown rot surprises cherry growers

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

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  • Use glyphosate  with caution

Use glyphosate with caution

  • September 1st, 2010

This stunted apple tree, which has a large basal canker, is in an orchard where the grower used glyphosate alone three to four times a year to control weeds. Cuts on the margin of the canker show healthy green tissue.

Growers often express concern that a herbicide program using glyphosate [...]

  • Symptoms of glyphosate damage

Symptoms of glyphosate damage

  • September 1st, 2010

Young trees can show injury after glyphosate application the previous year. One symptom of glyphosate damage is small spindly leaves that look like zinc deficiency. Shoot tips die so you get clustered growth.

Micronutrient (and often some macronutrient) deficiency
Low vigor, slow growth, stunting
Leaf chlorosis (yellowing), complete or between [...]

Managing new pests

  • September 1st, 2010

Pacific Northwest growers are vigilant following reports of spotted wing drosophila among Concord grapes in eastern Washington and the early appearance of the flies in traps in British Columbia’s Okanagan Valley in Canada.

While the susceptibility of wine grapes is not known, table grape and stone fruit ­growers fear the [...]

Antibiotic on organic sunset list

  • July 1st, 2010

Organic tree fruit growers in the Pacific Northwest are concerned that the National Organic Standards Board might drop its approval of the antibiotic Mycoshield (oxytetracycline or tetracycline) for organic production in 2012. The product is used to manage fireblight in apples and pears.

The NOSB has a list of more [...]

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  • June 1st, 2010

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  • NW questions cherry fruit fly quarantine

NW questions cherry fruit fly quarantine

  • June 1st, 2010

The western cherry fruit fly has not been found in California’s cherry-growing districts.

State officials in Oregon and Washington say ­California’s quarantine requirements for the Western cherry fruit fly are unjustified.

Helmuth Rogg, supervisor of the Oregon State Department of Agriculture’s Insect Pest Prevention and Management Program, said California has imposed [...]

Quarantine alternative

  • June 1st, 2010

Dr. Wee Yee, entomologist with the U.S. Department of Agriculture in Yakima, Washington, is conducting research to assess the likelihood of cherry fruit fly becoming established in certain overseas markets that are concerned about potential infestations of the pest, such as Indonesia and Thailand. Dr. Lisa Neven is cooperating [...]

  • Protect trees from weeds and pests

Protect trees from weeds and pests

  • May 15th, 2010

Control weeds while they’re small and easy to kill, so they don’t compete with the young trees.

In a new orchard, weeds have every condition they need to thrive and compete with the trees—full sun, regular moisture, and nutrients. Keep a sharp eye on the weeds right from the start [...]

  • Wasps ruin cherry crop

Wasps ruin cherry crop

  • May 15th, 2010

The European paper wasp looks similar to a yellow jacket, but has a narrower body and longer hind legs.

Cherry growers in British Columbia, Canada, are battling a pest that last year forced several of them to walk away from their crop before ­picking.

The European paper wasp (Polistes dominulus) was [...]

  • Moth poses little risk in Taiwan

Moth poses little risk in Taiwan

  • May 15th, 2010

Dr. Lisa Neven is studying the survival of codling moth larvae in tropical conditions.

There is little risk of codling moth larvae shipped in apples to Taiwan resulting in the pest becoming established in that country, research by Dr. Lisa Neven, insect physiologist at the U.S. Department of Agriculture’s research [...]

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  • May 15th, 2010

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  • Preventing pear rot

Preventing pear rot

  • May 15th, 2010

Dr. David Sugar, plant pathologist at Oregon State University, says the nitrogen and calcium levels in the orchard can affect the potential for decay in pears after harvest.

Orchard management can play an important role in ­minimizing postharvest decay in pears, says Dr. David Sugar, pathologist with Oregon State University [...]