• Growers have several choices in fireblight control

Growers have several choices in fireblight control

  • February 15th, 2013

Pear and apple orchardists have a fairly broad field of products to use in controlling fireblight—and it should get even more crowded in the coming year with new registrations anticipated, says an Oregon State University plant pathologist.

Several new products have registrations pending and could be registered in 2013, said [...]

  • Fireblight, antibiotics, and the NOSB

Fireblight, antibiotics, and the NOSB

  • February 15th, 2013

Antibiotics have long been key disease control materials for fireblight, one of the few uses of antibiotics in plant agriculture. These materials are natural compounds produced by naturally occurring soil microorganisms. For the past several decades, the most common control for fireblight has been the use of antibiotic sprays [...]

  • Last Bite

Last Bite

  • February 15th, 2013

1  Which of the following is not a fruit symptom of little cherry disease?
a.    Small size
b.    Poor color
c.    High acids
d.    Poor shape

2    Which of the following rootstocks is not resistant to fireblight?
a.    Geneva 41
b.    Budagovsky 9
c.    PiAu-56-83
d.    Malling 26

3     What [...]

  • Fireblight-resistant apple

Fireblight-resistant apple

  • February 15th, 2013

Ladina, a new high-quality apple variety with low susceptibility to fireblight and mildew, has been developed by a Swiss research station. The variety is also scab resistant. Ladina, bred at the Swiss federal research institute Agroscope­ ­Changins-Wädenswil, comes from a cross of Topaz and Fuji made in 1999. The [...]

  • An expensive disorder

An expensive disorder

  • February 15th, 2013

Photos courtesy of Bhaskar Bondada

A shrivel is not just a shrivel.

Of the various types of shrivel impacting grape quality, sour shrivel is especially unwanted because it renders the fruit unsuitable for winemaking.

The disorder, found in vineyards around the world, is known by several names. In California, researchers have begun [...]

  • Identifying grape shrivels

Identifying grape shrivels

  • February 15th, 2013

In the past, grape growers have mistaken any shrivel in their fruit for grape berry shrivel, also known as sour shrivel, says Washington State University’s Dr. Bhaskar Bondada. In a panic, some were needlessly thinning clusters to remove what they thought were berries afflicted with sour shrivel.

It’s important to [...]

  • Turning on a plant’s defenses

Turning on a plant’s defenses

  • February 15th, 2013

New technology is coming to the apple and pear industry to help control fireblight. Actigard is a systemic compound with a unique mode of action that mimics the natural systemic-activated resistance response found in many plants. When applied preventatively, much like vaccinations are given to humans to ward off [...]

  • Coppers are a fit for organics

Coppers are a fit for organics

  • February 15th, 2013

Before the 1960s, there were no antibiotics to help orchardists control fireblight, one of the most destructive diseases of pears and apples. Copper materials were the mainstay back then.

But coppers are returning as fireblight control products, particularly for organic orchardists. Oxytetracycline, an effective antibiotic, could lose its place on [...]

  • Fireblight is native to North America

Fireblight is native to North America

  • February 15th, 2013

Fireblight is a plant disease of apples and pears caused by the bacterium Erwinia amylovora. It is native to North America where it resides in wild hosts such as crab apple and hawthorn. Over the decades, it has spread to other pome fruit producing regions in Europe, the Middle [...]

  • Last Bite

Last Bite

  • January 15th, 2013

1.    Which of the following is not a tree fruit disease?
a.    Black rot
b.    Blue mold
c.    White rot
d.    Pink rot
e.    Coral rot
f.    Gray mold
2.    Which of the following is not a fungicide?
a.    Topguard
b.    Centaur
c.    Nordox
d.    Regalia
3. [...]

  • Research project tackles trunk diseases

Research project tackles trunk diseases

  • November 1st, 2012

Researchers will use nearly $1.8 million in grant money to develop new detection, extension, and research tools for managing wood-canker diseases of grapes and nut crops. Wood-canker diseases are a leading cause of vineyard and orchard removal in many parts of the country.

The research project was one of 14 [...]

  • Fireblight expert retires

Fireblight expert retires

  • October 1st, 2012

Larry Pusey has used crab apples for his fireblight studies, as they can be manipulated to bloom year round in the greenhouse.
Geraldine Warner

For almost 20 years, Dr. Larry Pusey has been focused on researching a single problem—­fireblight.

As Pusey, 60, retires this month as plant pathologist with the U.S. [...]