Penn State University Develops Bitter Pit Prediction Model

Following a three-year study in commercial ‘Honeycrisp’ orchards, Rich Marini, Professor of Horticulture at Penn State University, and Tara Baugher, Penn State University Extension Educator in Tree Fruit, have developed a predication model for bitter pit.

The research team studied the relationship of bitter pit incidents and the measurement of minerals in fruit peels.

“Bitter pit was negatively correlated with calcium and consistently positively correlated with potassium, phosphorous and ratios of magnesium/calcium, potassium/calcium and nitrogen/calcium,” they write.

They also found bitter pit increased as shoot length increased and bitter pit decreased as crop load increased.

“The best combination of variables for predicting bitter pit was average shoot length plus the nitrogen/calcium ratio in the fruit peel,” they wrote.

The team posts a chart to help growers predict the potential for bitter pit based on shoot lengths on the Penn State University Tree Fruit website. Baugher and Marini say this model shows the need for good management of terminal shoot growth as well as management of calcium and nitrogen in the fruit.

 

Topics:

Leave a Reply

One comment on “Penn State University Develops Bitter Pit Prediction Model

  1. 8 year old orchard, soil pH 5.8, 150 Honeycrisp on bud 9 with no supplemental water (avg. 1″ /mo. precipitation), no fertilizer or calcium added to SOIL or foliage, moderate annual cropping with no flesh disorders has also lead me to this assessment

Apples & Pears Stories
Apples & Pears
August 9, 2017
2017 Washington Apple Crop Down Slightly
Forecasted harvest predicted to be 131 million boxes, down 1.2% from 2016. Read More
Apples & Pears
August 5, 2017
Penn State University Develops Bitter Pit Prediction Model
Research team unlocks relationship between bitter pit, minerals, and shoot lengths. Read More
Apples & Pears
August 1, 2017
New York Growers’ Input Needed on Apple Tree Decline
Project has begun to identify rapid collapse and chronic decline being found in young Eastern apple orchards. Read More
Apples & Pears
July 25, 2017
Tips to Transition to an Apple Fruiting Wall System
Follow these suggestions to make the move from a 3-D spindle-shaped canopy to a 2-D system using mechanical pruning. Read More
Apples & Pears
June 30, 2017
Tackling the Challenges of Organic Apple Production Head-on
Researchers at Michigan State University test organic controls for fire blight. Read More
Apples & Pears
June 29, 2017
Integrating Control Methods to Tackle Fire Blight
Fire blight is a damaging disease, no matter the location. Most production areas of the Pacific Northwest and California experience Read More
Apples & Pears
June 28, 2017
Apple Tree Insurance Program Being Developed
U.S. Apple Association working with AgriLogic Consulting, LLC and USDA Risk Management Agency to offer new risk management option which takes into effect weather damage and fire blight loses. Read More
Apples & Pears
June 26, 2017
Cosmic Changes Coming in Apple Production [Opinion]
‘Cosmic Crisp’ is an apt moniker for Washington’s new apple, because the changes coming to the industry are immense Read More
Apples & Pears
June 23, 2017
Take Advantage of Technology to Help Manage Diseases, Pest Pressure
Expert farm advisers provide several options for apple orchard management decisions. Read More
Apples & Pears
June 19, 2017
Bee-ware: New Resources Released for National Pollinator Week
New videos, webinars available during week-long observance. Read More
Apples & Pears
June 13, 2017
Two Bookkeepers and Family Charged With Stealing $1M from Zirkle Fruit
Payroll-scheme printed checks for phantom employees on payroll, but not working for the operation. Read More
Apples & Pears
June 9, 2017
Northwest Pear Crop Down Slightly
Washington and Oregon growers estimate the crop will be down 2% from 2016, 10% off the five-year average. Read More
Apples & Pears
June 9, 2017
San Jose Scale Control Strategies
It’s time to start scouting and treat trees when trapping indicates. Read More
Apples & Pears
June 5, 2017
Ease Bitter Pit by Boosting Calcium
Promising research shows the link between transpiration and calcium uptake and how abscisic acid may help reduce calcium disorders in ‘Honeycrisp.’ Read More
The Latest
Apple Grower of the Year
August 22, 2017
U.S. Apple Association Hosts Annual Appl…
American Fruit Grower® and Western Fruit Grower® magazine’s 2017 Apple Grower of the Year will be officially presented on Thursday, Aug. 24, during the first day of the conference. Read More
Apples & Pears
August 20, 2017
APHIS Seeks Comments on Risk Removal for…
Dormant live cuttings from countries in the European Union must currently go through pest risk assessment. Read More
Apples & Pears
August 15, 2017
Wet Weather Breeds Phytophthora in Young…
Crown rot, root rot flourishing in very wet growing season. Read More
Apples & Pears
August 9, 2017
2017 Washington Apple Crop Down Slightly
Forecasted harvest predicted to be 131 million boxes, down 1.2% from 2016. Read More
Apples & Pears
August 5, 2017
Penn State University Develops Bitter Pi…
Research team unlocks relationship between bitter pit, minerals, and shoot lengths. Read More
Apples & Pears
August 1, 2017
New York Growers’ Input Needed on Apple …
Project has begun to identify rapid collapse and chronic decline being found in young Eastern apple orchards. Read More
Apples & Pears
July 25, 2017
Tips to Transition to an Apple Fruiting …
Follow these suggestions to make the move from a 3-D spindle-shaped canopy to a 2-D system using mechanical pruning. Read More
Apples & Pears
July 6, 2017
International Fruit Tree Association See…
Deadline for proposals is July 31. Read More
Apples & Pears
June 30, 2017
Tackling the Challenges of Organic Apple…
Researchers at Michigan State University test organic controls for fire blight. Read More
Apples & Pears
June 29, 2017
Integrating Control Methods to Tackle Fi…
Fire blight is a damaging disease, no matter the location. Most production areas of the Pacific Northwest and California experience Read More
Apples & Pears
June 28, 2017
Apple Tree Insurance Program Being Devel…
U.S. Apple Association working with AgriLogic Consulting, LLC and USDA Risk Management Agency to offer new risk management option which takes into effect weather damage and fire blight loses. Read More
Apples & Pears
June 26, 2017
Cosmic Changes Coming in Apple Productio…
‘Cosmic Crisp’ is an apt moniker for Washington’s new apple, because the changes coming to the industry are immense Read More
Apples & Pears
June 23, 2017
Take Advantage of Technology to Help Man…
Expert farm advisers provide several options for apple orchard management decisions. Read More
Apples & Pears
June 19, 2017
Bee-ware: New Resources Released for Nat…
New videos, webinars available during week-long observance. Read More
Apples & Pears
June 13, 2017
Two Bookkeepers and Family Charged With …
Payroll-scheme printed checks for phantom employees on payroll, but not working for the operation. Read More
Apples & Pears
June 9, 2017
Northwest Pear Crop Down Slightly
Washington and Oregon growers estimate the crop will be down 2% from 2016, 10% off the five-year average. Read More
Apples & Pears
June 9, 2017
San Jose Scale Control Strategies
It’s time to start scouting and treat trees when trapping indicates. Read More
Apples & Pears
June 5, 2017
Ease Bitter Pit by Boosting Calcium
Promising research shows the link between transpiration and calcium uptake and how abscisic acid may help reduce calcium disorders in ‘Honeycrisp.’ Read More