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Photo: Sladjana Prozo
Fruit Disorders - New Tool to Assess the Potential for Bitter Pit in Honeycrisp - Articles Articles
Bitter pit severity varies with cultivar and season, but Honeycrisp is particularly susceptible. Penn State has developed a new model for predicting bitter pit potential. More
On-Farm Research III—Evaluating Relationships Between Variables
On-Farm Research III—Evaluating Relationships Between Variables - Articles Articles
Evaluating relationships between variables involves a statistical method called “regression analysis.” More
Photo: Tara Baugher
Fruit Color - Promoting Red Color Development in Apple - Articles Articles
Fruit surface color is complex due to genetics and mutations, environmental factors, crop load, plant nutrition, plant stresses, and plant growth regulators. More
Bitter pit begins to show up on Honeycrisp several weeks before harvest and the incidence can increase two- to four-fold after a month in storage. Photo: Tara Baugher
Apple Fruit Disorders - Crop Load and Nutrient Management to Prevent Bitter Pit - Articles Articles

Apple Fruit Disorders - Crop Load and Nutrient Management to Prevent Bitter Pit

Tara Baugher, Rich Marini, Ph.D., James Schupp, Ph.D.

Multiple years of studies in grower orchards are providing additional clues for managing Honeycrisp in the orchard to prevent bitter pit following storage. More
G.935 is replant tolerant, but is susceptible to some latent viruses, highlighting the importance of choosing rootstocks that best fit your own unique orchard conditions. Photo by Rob Crassweller
Apple Rootstocks on the Horizon - Articles Articles
I spent most of the summer writing a review paper on apple rootstocks and came across information that might be of interest to commercial fruit growers. More
Photo: Rich Marini
Strawberry Cultivars - An Historical View - Articles Articles
Do you think older strawberry cultivars tasted better than the newer cultivars? More
Cold-injured primary blackberry bud (left) and uninjured secondary bud (right). Photo credit: Fumi Takeda, USDA-ARS-AFRS
Small Fruit Cold Hardiness - Winter Injury in Brambles - Articles Articles
Weather is also becoming more variable resulting in early-winter cold snaps and winter thaws followed by extreme cold events. More
Soggy breakdown on 2014 PA fruit. Photo courtesy of Yosef Al Shoffe, Cornell
Fruit Disorders - Harvest Practices to Prevent Storage Disorders in Honeycrisp - Articles Articles

Fruit Disorders - Harvest Practices to Prevent Storage Disorders in Honeycrisp

Tara Baugher, James Schupp, Ph.D., Rich Marini, Ph.D.

There are many factors that affect Honeycrisp storage behavior, and some occur during harvest. More
On-Farm Research II - Summarization and Analysis of Data
On-Farm Research II - Summarization and Analysis of Data - Articles Articles
A recent article described some important aspects of designing field experiments to avoid biasing the data. This article will describe methods to summarize and interpret the data. More
Example of a randomized complete block design layout for comparing treatments in a peach block. Treatments were applied to multiple-tree units in each of 4 rows in the block.
On Farm Research - Articles Articles

On Farm Research

Rich Marini, Ph.D.

Recently some growers have expressed a desire to perform research trials in their orchards. More
Pruning just before a cold snap increases susceptibility to injury.
Tree Fruit Cold Hardiness - Pruning Effects - Articles Articles

Tree Fruit Cold Hardiness - Pruning Effects

Rich Marini, Ph.D., James Schupp, Ph.D.

Fruit trees begin to go dormant in response to shortening day length in the fall. Exposure to freezing temperatures accelerates the onset of dormancy. More
Fruit Harvest - Estimating Apple Yield and Fruit Size
Fruit Harvest - Estimating Apple Yield and Fruit Size - Articles Articles
Early-season yield and packout predictions are useful for growers and packers to plan for adequate harvest labor and storage space and to develop an orderly marketing plan. More
Tree Fruit Cold Hardiness - Effect of Pruning
Tree Fruit Cold Hardiness - Effect of Pruning - Articles Articles
When there is a sudden drop in temperature the trees most injured are those that lack adequate vigor, those that were too vigorous, and those that had been pruned before the cold event. More
Summer shearing of peach trees can reduce fruit size and soluble solids, but if vigorous vegetative shoots that shade the tree interior are removed by hand pruning by early July, quality shoots in the tree interior can be maintained.
Fruit Tree Pruning - Summer Pruning Cautions - Articles Articles
Summer pruning is a vague term and simply refers to the time of year pruning is performed (when trees have foliage) and does not describe the type of pruning cuts. More
Tree Fruit Cold Hardiness - Pruning Peach Trees with No Crop
Tree Fruit Cold Hardiness - Pruning Peach Trees with No Crop - Articles Articles
Low winter temperatures and/or spring frosts sometimes result in the loss of the entire peach crop. Below are some considerations for managing trees with no crop. More
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