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Powdery mildew on blossoms. The powdery mildew fungus likes young tissue. As tissue begins to grow, the fungus will colonize young, green tissue as it emerges. Photo: Kari Peter, Penn State
Spraying by the Numbers: Fungicide Resistance Management - Articles Articles

Spraying by the Numbers: Fungicide Resistance Management

Kari A. Peter, Ph.D., Alan R. Biggs

Growers can prevent resistance to fungicides by alternating chemicals by FRAC group also known as "spraying by the numbers." More
Coleus muestra los síntomas de la aplicación del agua con altos sólidos disueltos totales y conductividad eléctrica. Foto: Tom Ford, Penn State
Calidad del Agua de Riego Para Túneles Altos - News News
La calidad del agua tiene una gran influencia en el crecimiento y desarrollo de los cultivos. More
Coleus showing symptoms from applying water with high total dissolved solids and electrical conductivity. Photo: Tom Ford, Penn State
Irrigation Water Quality for High Tunnels - News News
Water quality has a large influence on crop growth and development. More
Photo: Tom Ford, Extensión de Penn State
Informe de Prueba del Suelo del Túnel Alto: Materia Orgánica y Capacidad de Intercambio Catiónico - News News
El año pasado, hemos estado trabajando con 27 agricultores y agricultoras de Pennsylvania para entender mejor los suelos en túneles altos. More
Early snow on apple blossoms. Photo: Tara Baugher, Penn State
Registration is Open for the 2019 Commercial Tree Fruit Meetings - News News
Penn State Extension has planned nine regional educational meetings for commercial tree fruit producers in 2019. More
Photo by Tricia Borneman, Blooming Glen Farm
Manteniendo Frescos los Productos Agrícolas Frescos - Articles Articles
Manejo postcosecha para venta en mercados de agricultores y venta directa de la huerta a instituciones. More
Sanitation will be critical for managing disease for the 2019 season. Photo: K. Peter, Penn State
Disease Update: Cleaning Up the Messy 2018 Season - News News
There were many diseases affecting tree fruit growers in 2018. Sanitation will be very important while preparing for the 2019 season. More
Leaf infected with Marssonina. Photo: K. Peter, Penn State
Apple Disease - Marssonina Blotch - Articles Articles

Apple Disease - Marssonina Blotch

Kari A. Peter, Ph.D.

Marssonina blotch, caused by Marssonina caronaria, is a foliar disease first identified in Pennsylvania in September 2017. More
Photo: Tom Ford, Penn State
High Tunnel Soil Test Report: Organic Matter and Cation Exchange Capacity - News News
Cation Exchange Capacity or CEC is a measure of the ability of a soil to hold cations or elements with positive charges. More
La roña de la manzana necesita material orgánico para invernar
MIP – Exploración y Manejo de la Roña de la Manzana - Articles Articles

MIP – Exploración y Manejo de la Roña de la Manzana

Kari A. Peter, Ph.D., Montserrat Fonseca Estrada, Tianna Dupont

Asegúrese de saber dónde pasa el invierno la roña de manzana, cómo supervisarla y cuándo es más probable que aparezca. More
Bitter rot on apple and pear fruit is caused by the pathogenic fungi Colletrotrichum gloeosporioides and C. acutatum. Photo: Kari Peter, Penn State
Wanted: Bitter Rot of Apple Samples From Pennsylvania Growers - News News
The Tree Fruit Pathology Lab at the Fruit Research and Extension Center is seeking apples infected with the fungus causing bitter rot from around the state of Pennsylvania in commercial orchards. More
Un túnel alto donde el agricultor está utilizando un sistema de tierra para macetas para cultivar cultivos. Foto: Tom Ford, Extensión de Penn State
Informe de Prueba del Suelo del Túnel Alto: Niveles de Sales Solubles - News News
Continuamos nuestra serie donde hemos estado examinando informes de prueba del suelo para los túneles altos. More
Corn earworm counts are rising throughout PA.
Vegetable - Small Fruit Production Issues: August 2, 2018 - News News
July started out dry and hot but transitioned quickly, with almost no warning, to very wet and hot. More
A high tunnel where the farmer is using a soilless media system to grow crops. Photo: Tom Ford, Penn State
High Tunnel Soil Test Report: Soluble Salts Levels - News News
Soluble salts commonly found in soils are calcium, magnesium, sodium, chloride, sulfate, and bicarbonate. Potassium, ammonium, nitrate, and carbonate are also found, but in smaller quantities. More
Hail damaged fruit need protection from fruit rots. Photo: T. Ford, Penn State
Managing Fruit Rots This Season - News News

Managing Fruit Rots This Season

07/26/2018

Fungicide re-applications are necessary since several inches of rain have fallen the last few days. Management considerations are discussed for mitigating pome and stone fruit rots. More
Japanese beetle on raspberries. Photo: Kathy Demchak, Penn State
Vegetable - Small Fruit Production Issues: July 12, 2018 - News News
Downy mildew was confirmed on cucumber in Mifflin County on July 11. Warmer weather throughout the state is helping crops along, but has also been good for insect pests. More
The potato leafhopper, Empoasca fabae, is a pest that is easy to overlook until the damage - called "hopperburn" - "burns" you. Photo: Penn State College of Agriculture
Vegetable - Small Fruit Current Issues: June 28 2018 - News News
Wet weather and variable temperatures across the state continue to be challenging for vegetable and berry production. More
Photo: Tom Ford, Extensión de Penn State
Informe de Prueba del Suelo del Túnel Alto: pH del Suelo - News News
pH del suelo en una encuesta de 27 túneles altos en Pennsylvania More
Photo: Tom Ford, Extensión de Penn State
Informe de prueba del suelo del túnel alto: Niveles de nutrientes del suelo - News News
Niveles de fósforo, potasio, magnesio y calcio en una encuesta de 27 túneles altos en Pennsylvania. More
Keep leaves on the tart cherry trees: Postharvest fungicide applications are necessary to limit cherry leaf spot infections. Photo: K. Peter, Penn State
Mid-Season Tree Fruit Disease Update - News News
The latest 2018 disease updates growers need to know for apple scab, fire blight, sooty blotch and flyspeck, bacterial spot, and cherry leaf spot. More
High tunnel tomatoes. Photo: Tom Ford, Penn State
High Tunnel Soil Test Report: Soil Nutrient Levels - News News
Phosphorus (P), potassium (K), magnesium (Mg), and calcium (Ca) levels in a survey of 27 high tunnels across Pennsylvania. More
Tree Fruit Disease Toolbox - Fungicide Resistance Management
Tree Fruit Disease Toolbox - Fungicide Resistance Management - Articles Articles
Resistance has sometimes resulted in pest-management-program failures. Below are presented tactics to help delay resistance to fungicides. More
Tiny, black, spherical structures are produced on stalks above the white mold. Each of these contains thousands of spores that are released to float in the air. Photo by K. Peter.
Stone Fruit Disease - Rhizopus Rot - Articles Articles

Stone Fruit Disease - Rhizopus Rot

Kari A. Peter, Ph.D.

Rhizopus rot, caused by Rhizopus nigricans, can be very destructive to harvested fruit. More
Source: Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
Apple Disease - Blossom End Rot - Articles Articles

Apple Disease - Blossom End Rot

Kari A. Peter, Ph.D.

Blossom end rot of apple, is caused by various fungi (Sclerotinia sclerotiorum, Botrytis cinerea, Botrysphaeria obtusa) just before or during petal fall. More
Black rot on cabbage, caused by the bacterium Xanthomonas campestris pv. campestris. Note characteristic “V” shaped lesions starting at leaf margin. Photo: Lee Stivers, Penn State
Vegetable - Small Fruit Current Issues: Mid-June 2018 - News News
Cloudy weather, rainstorms, and variable temperatures across the state have slowed some crops and created very favorable conditions for disease development. More
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