Content tagged "apple"

Choosing the Right Cultivar to Plant

Apples Updated: August 02, 2017

Several variables should be considered when selecting apple cultivars to plant. Important factors include cold hardiness (some cultivars will not survive...

Apple Cultivars

Apples Updated: August 02, 2017

Parentage of Apple CultivarsDisease-Resistant Apple CultivarsRed Color Development in ApplesApple Fruit ShapesHow Apple Fruit Size is Determined and...

Apple Rootstock Trial Results

Apples Updated: December 30, 2014


An Introduction to Hard Cider in the U.S.

Apples Updated: June 16, 2014

By the simplest definition, hard cider is fermented apple juice. In the U.S., unfermented and usually unfiltered apple juice is referred to as cider or sweet...

Plum Curculio

Apples Updated: June 16, 2014

The plum curculio, Conotrachelus nenuphar (Herbst), is an important early season pest of pome and stone fruits.  They can cause considerable damage to apple,...

Codling Moth

Apples Updated: June 16, 2014

Codling moth, Cydia pomonella, is one of the most serious insect pests of apple in the United States.Biology and Life HistoryAdult moths are approximately 10...

Emily Hoover, University of Minnesota

Apples Updated: June 13, 2014

Dr. Emily Hoover is currently the Head of the Department of Horticultural Sciences, overseeing diverse research, extension, and teaching programs....

Jon Clements

Apples Updated: June 13, 2014

Jon Clements is an Extension educator with 25 years experience in tree fruit production. Located at the UMass Cold Spring Orchard in Belchertown,...

Alan Biggs, West Virginia University

Apples Updated: June 13, 2014

Alan Biggs is a Professor of Plant Pathology and Extension Specialist in Tree Fruit Pathology at the Kearneysville Tree Fruit Research and Education Center...

Apple Fruit Thinning

Apples Updated: September 02, 2013

Fruit thinning is a management practice that reduces the number of fruits per tree in the current season, resulting in increased fruit size of the remaining...

How Apple Fruit Size Is Determined and Affected

Apples Updated: September 02, 2013

An apple's size is determined by the cells that make up the apple. The number of cells, size of each cell, and air space between cells all can play roles in...

Timing of Apple Tree Bloom

Apples Updated: September 02, 2013

Apple trees begin visible growth in the Spring of the year after having had their chilling requirement met, measured as chilling hours (800-1200 hours), ...

Apple Maggot

Apples Updated: August 17, 2013

Figure 1. Adult apple maggot Rhagoletis pomonella (Walsh). (Joseph Berger, maggot (Rhagoletis pomonella (Walsh)) is a potentially serious...

Pollinating Apples

Apples Updated: August 17, 2013

Figure 1. Bumblebee on apple blossom (Alan R. Biggs, West Virginia University)Apples require cross-pollination for optimal fruit set and size. ...

Apple Tree Propagation: Grafting

Apples Updated: August 14, 2013

 Several grafting techniques are possible. The one to use depends on the conditions under which the grafting is to be done. Whip grafting, sometimes called...

Apple Scab

Apples Updated: August 14, 2013

Apple scab is the most important fungal disease of apples in eastern growing regions of the United States, especially in the cooler climate regions. If not...

Pre-harvest Drop

Apples Updated: December 06, 2012

Apples sometimes drop to the ground before they reach the desired harvest maturity. This pre-harvest fruit drop can cause significant losses in apple...

Bitter Pit and Calcium Deficiencies in Apple Fruit

Apples Updated: November 13, 2012

Calcium deficiencies contribute to certain fruit disorders in apple, including bitter pit.  Bitter pit is a physiological disorder of apple fruit that has...

Apple Fruit Cracking

Apples Updated: November 13, 2012

Fruit of some apple cultivars tend to crack during the second half of the growing season. Sometimes cracking is limited to the stem end, and other times, the...

Tarnished Plant Bug

Apples Updated: November 13, 2012

The tarnished plant bug, Lygus lineolaris (Hemiptera: Miridae), is found in agricultural and disturbed areas throughout the United States. It has one of the...

Disease-Resistant Apple Cultivars

Apples Updated: November 07, 2012

There are more than 100 modern apple cultivars, and several dozen antique varieties, that have been selected in part for their disease resistance. They offer...

Powdery Mildew

Apples Updated: November 07, 2012

Powdery mildew can be a persistent disease of susceptible apple cultivars throughout the United States. It is one of the most predominant diseases in the...

A High Density Apple Production System for the Home Garden

Apples Updated: July 11, 2012

Have you ever considered planting a high density orchard at home?  Nearly full production can be achieved within four years, less space will be required, a...

Apple Fruit Shapes

Apples Updated: May 29, 2012

 Fruit shape is one of several characteristics used to identify apple cultivars. When apples are mature, the fruit is cut longitudinally in half  through the...

Fire blight

Apples Updated: March 27, 2012

Fire blight is a destructive bacterial disease of apples and pears that kills blossoms, shoots, limbs, and, sometimes, entire trees. The disease is generally...

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This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.