Featured Research

from universities, journals, and other organizations

Helping Hop Growers Predict Powdery Mildew

Date:
June 28, 2004
Source:
USDA/Agricultural Research Service
Summary:
Agricultural Research Service scientists and cooperators have created an Internet-based model to help farmers determine when fungicides should be applied to help control hop powdery mildew in the Pacific Northwest.

Powdery mildew on a cone and leaves.
Credit: Image courtesy of Walter F. Mahaffee.

Agricultural Research Service scientists and cooperators have created an Internet-based model to help farmers determine when fungicides should be applied to help control hop powdery mildew in the Pacific Northwest.

Since hop powdery mildew's emergence in the Pacific Northwest in 1996, the disease has had a major impact on the hop industry, resulting in the loss of the entire crop on thousands of acres in some years. The disease can be controlled with fungicides, but annual control costs have been as high as $400 per acre.

To economically manage the disease while protecting the environment, growers need methods to help them decide when fungicides should be used. So ARS plant pathologist Walter F. Mahaffee of the Horticultural Crops Research Unit, Corvallis, Ore., and Carla Thomas of the University of California, Davis, developed the model.

The hops model is a modification of the Gubler/Thomas grape powdery mildew risk infection model that is used in all grape-growing regions of the world. Mahaffee's team demonstrated that brief exposure to high temperatures inhibited disease development. They then used this information to develop model rules to more accurately predict the risk of infection.

In conjunction with FoxWeather, Mahaffee's team further developed the model to predict the infection risk five days into the future. In 2002 and 2003, this forecast was 80 percent accurate for one day into the future and 60 percent accurate for five days into the future. Trials in grower fields and small plots in 2002 and 2003 showed that growers could reduce fungicide use by one to three applications and still have less disease.

Since powdery mildew affects a wide variety of crops, Mahaffee hopes to further modify the model so it can predict the infection risk of all powdery mildews, regardless of region.

ARS is the U.S. Department of Agriculture's chief scientific research agency.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "Helping Hop Growers Predict Powdery Mildew." ScienceDaily. ScienceDaily, 28 June 2004. <www.sciencedaily.com/releases/2004/06/040625083735.htm>.
USDA/Agricultural Research Service. (2004, June 28). Helping Hop Growers Predict Powdery Mildew. ScienceDaily. Retrieved September 18, 2014 from www.sciencedaily.com/releases/2004/06/040625083735.htm
USDA/Agricultural Research Service. "Helping Hop Growers Predict Powdery Mildew." ScienceDaily. www.sciencedaily.com/releases/2004/06/040625083735.htm (accessed September 18, 2014).

Share This



More Plants & Animals News

Thursday, September 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chimp Violence Study Renews Debate On Why They Kill

Chimp Violence Study Renews Debate On Why They Kill

Newsy (Sep. 17, 2014) The study weighs in on a debate over whether chimps are naturally violent or become that way due to human interference in the environment. Video provided by Newsy
Powered by NewsLook.com
Some Tobacco Farmers Thrive Amid Challenges

Some Tobacco Farmers Thrive Amid Challenges

AP (Sep. 16, 2014) The South's tobacco country is surviving, and even thriving in some cases, as demand overseas keeps growers in the fields of one of America's oldest cash crops. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

Scientists Given Rare Glimpse of 350-Kilo Colossal Squid

AFP (Sep. 16, 2014) Scientists say a female colossal squid weighing an estimated 350 kilograms (770 lbs) and thought to be only the second intact specimen ever found was carrying eggs when discovered in the Antarctic. Duration: 00:47 Video provided by AFP
Powered by NewsLook.com
Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins