Fast, easy test reveals fungicide resistance

  • July 1st, 2011

When disease organisms become resistant to a fungicide, spraying is like hitting them with rainwater—expensive rainwater.

In the last three years, Georgia and South Carolina peach growers have saved money from what would have been wasted sprays and lost fruit caused by fungicide-resistant brown rot—thanks to a Profile kit developed [...]

  • Virus-free peach trees

Virus-free peach trees

  • July 1st, 2011

Simon Scott moves plants at the Musser Fruit Research Farm’s greenhouse, where about 300 trees of a hundred low-chill cultivars will be grown.
Richard Lehnert

Until plum pox virus (PPV) appeared in Pennsylvania peach orchards in 1999, many peach growers took a pretty casual view of viruses—living with them and [...]

  • Peaches on ridges

Peaches on ridges

  • July 1st, 2011

Impressed by early research results, Titan Farms planted 200 acres of peaches on ridges to try out this new approach to Armillaria root rot.
Richard Lehnert

Since coming to Clemson University in 2000, Dr. Guido Schnabel has been taking on the two big disease problems that plague peach growers in [...]

  • Fungicide tools and resistance management guidelines

Fungicide tools and resistance management guidelines

  • May 15th, 2011

As of spring 2011, growers in eastern Washington have several new fungicides at their disposal for managing powdery mildew.

For cherry growers, new products include Adament ­(tebuconazole + trifloxystrobin), Quash (metconazole), and Unicorn (tebuconazole + sulfur).

Four new materials are available for grape growers: Adament, Inspire Super ­(difenoconazole + cyprodinil), Unicorn, [...]

  • How to manage scab and mildew

How to manage scab and mildew

  • April 1st, 2011

Powdery mildew appears as superficial, white powdery growth on leaves and shoots that results in the stunting and distortion of young growth. Right: ruit like this Jonathan apple, when infected with powdery mildew, are stunted and russetted, and fruit set may be reduced.
BRITISH COLUMBIA MINISTRY OF AGRICULTURE

A good [...]

  • Clean plant center has new manager

Clean plant center has new manager

  • April 1st, 2011

James Susaimuthu inspects plant material in the Fruit Tree Clean Plant Center’s greenhouse.

One of the goals of Dr. James Susaimuthu, new program manager of the Fruit Tree Clean Plant Center, is to use his diagnostic skills to find ways to improve virus testing of plant material.

Susaimuthu, with a background [...]

Good Stuff

  • March 15th, 2011

Sweet success
A new series of scab-resistant apples called “Sweet Resistants” developed by the Consorzio Italiano Vivaisti (CIV) in Italy was among the ten finalists for the Fruit Logistica Innovation Award during the Fruit Logistica trade fair in February. The five varieties in the series are Gaia, Gemini, Renoir, [...]

  • 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 [...]

  • 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 [...]

  • 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 [...]