• Clean plant material fundamental

Clean plant material fundamental

  • February 1st, 2011

The young vines in grow tubes are replants due to disease-contaminated plant material.

When Tedd Wildman began planting lesser-known red wine grape varieties on Washington State’s Wahluke Slope ten years ago, he was careful to source plant ­material from certified nurseries. But not careful enough.

At the time, certified plant material [...]

Mysterious ailment strikes

  • October 1st, 2010

A mysterious disease that has been killing the best looking, reddest strains of McIntosh apples in the nicest orchards in the northwest quadrant of Michigan has tentatively been identified, and growers now have some idea what to do about it.

“We’re not quite there yet,” said Dr. George Sundin, the [...]

  • 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 [...]

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 [...]

  • 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 [...]

  • Meeting the organic challenge

Meeting the organic challenge

  • May 1st, 2010

Harry and Jackie Hoch (center) gather in their orchard for a family photo on Easter weekend, where unusual 80-degree weather advanced the season, requiring sprays for disease control on the apricots and plums. With them are Harry’s mother, Jackie Senior, and their daughters Missy (far left) and Angi.
Photo [...]

Good Stuff

  • April 1st, 2010

Dream tractor?
The Mach 4 is an articulated reversible quad-track vehicle for specialized farming. Launched in Italy in 2008 as a “dream tractor,” it is now one of the leading models that Antonio Carraro produces. It is a universal vehicle designed to handle extreme working conditions on any kind [...]

  • Ontario faces challenges to plum pox virus eradication

Ontario faces challenges to plum pox virus eradication

  • April 1st, 2010

Symptoms of plum pox virus include chlorotic (yellow) rings on the leaf surface or chlorotic blotches and vein clearing.

A concentrated growing area is complicating efforts to eliminate plum pox virus from the main peach-growing region in Ontario, Canada.

The virus was expected to be eliminated in the provinceCanada’s biggest peach [...]

  • Fireblight without antibiotics

Fireblight without antibiotics

  • February 15th, 2010

Orchards that have secondary bloom or have later-blooming varieties are more at risk for fireblight infection.

Controlling fireblight without antibiotics is doable, but it requires an integrated approach combining delayed dormant copper sprays with frequent applications of biological agents, says a plant pathologist from Oregon State University.

The antibiotics streptomycin and [...]

  • Scab control more challenging

Scab control more challenging

  • February 15th, 2010

Apple scab overwinters in infected leaves on the orchard floor. Spores from the dead leaves are produced in the spring and can cause primary infection of fruit.

The Michigan growing season was wet last year. As a result, apple growers had a tougher-than-usual time controlling scab. But the weather was [...]

Good to know – Rayapati

  • February 15th, 2010

Grapevine fanleaf, an infectious degenerative disease, is the oldest known viral disease of grapevines. It is believed that fanleaf virus originated from ancient Persia and spread to other grape-growing regions via transport of vegetative propagative materials. Consequently, the disease has become established as one the most serious and devastating [...]

  • Controlling mildew in organic cherries

Controlling mildew in organic cherries

  • February 15th, 2010

Powdery mildew is a tough disease to control for Pacific Northwest cherry growers, but it’s even tougher for organic growers who have limited fungicides to use. With so few organic tools available, an integrated approach is needed, says a Washington State crop consultant.

Understanding the life cycle of cherry powdery [...]