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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
Black rot on cabbage, caused by the bacterium Xanthomonas campestris pv. campestris. Note characteristic ā€œVā€ 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
Be on alert for apple scab disease conditions until mid-June. Photo: Kari Peter, Penn State
Tree Fruit Disease Conditions Were on Steroids in May - News News
Conditions were incredibly optimal for many tree fruit diseases during the month of May. Management strategies for pome and stone fruit diseases are discussed. More
Fruitlets. Photo: Kari Peter, Penn State
Disease Update: Managing Diseases During Wet Weather - News News
Trees need to be protected during wet conditions. The following are strategies for keeping diseases in check on apple and stone fruit during persistent rainy weather. More
Early symptoms of blossom blight. Photo: K. Peter, Penn State
Disease Update: Fire Blight, Scab, Bacterial Spot Conditions Alert - News News
The forecast for May 15ā€“18 indicates conditions will be favorable for apple scab and bacterial spot on peach infections. If infections occurred during bloom, fire blight symptoms could begin to appear this week. More
Protect tart cherries during bloom to prevent cherry leaf spot infection.
Tree Fruit Diseases - Spring Control Strategies - Articles Articles
May is the battleground month for disease management: be on alert for apple scab, fire blight, powdery mildew, rust, cherry leaf spot, brown rot, and bacterial spot infection conditions. More
Left: gray mold; right: anthracnose fruit rot.
Strawberry Disease - Fruit Rot Protection Begins at Bloom - Articles Articles
Our two main targets for bloom time protection of strawberries are gray mold/ Botrytis fruit rot, and, if you are growing susceptible varieties like Chandler, anthracnose fruit rot. More
A thermometer that records the maximum and minimum temperature is extremely useful for determining degree hours.
Tree Fruit Diseases - Predicting Infection Periods to Apply Protection - Articles Articles
This article will help you manually determine infection periods for certain diseases. Also included is a table listing coppers available to manage bacterial spot during cover sprays. More
Bacterial spot on peach fruit. Photo by S. Bardsley.
Peach Disease - Bacterial Spot Differentiation from Copper Injury - Articles Articles
It can be confusing to discern between bacterial spot disease and copper injury. This article describes offers guidance to avoid the pitfalls of using copper for disease control. More
Source: John Hartman, University of Kentucky, Bugwood.org
Apple Disease - Blister Spot on Crispin (Mutsu) - Articles Articles
Crispin apples are highly susceptible to blister spot bacterial infection, Pseudomonas syringae, about 2 weeks after petal fall for a period of 2 to 4 weeks. More
Infected leaves have angular spots, most numerous at the tip ends and along midribs. Photo by K. Peter.
Stone Fruit Disease - Bacterial Spot - Articles Articles
Bacterial spot, caused by the bacterium Xanthomonas arboricola pv. pruni (formerly Xanthomonas campestris pv. pruni), occurs in most countries where stone fruit are grown. More
Bacterial spot on peach fruit. Photo by S. Bardsley.
Stone Fruit Disease - Bacterial Spot, Refining Disease Management - Articles Articles
Bacterial spot, Xanthomonas arboricola pv. pruni, is a difficult disease to manage. More
Postharvest fungicide sprays are necessary to prevent defoliation from cherry leaf spot. Photo: K. Peter, Penn State
Getting the Upper Hand on Tree Fruit Diseases in July - News News
Conditions may be optimal for several fungal and bacterial pome and stone fruit diseases in July. More
Dormant copper sprays are encouraged to help keep diseases in check. (Photo: K. Peter)
Disease Management Strategies For The Grower Radar - News News
Consider applying dormant sprays soon to manage fungal and bacterial diseases this season. More
Protect any trees still in bloom: Fire blight conditions ideal April 29 through May 2. (Photo: K. Peter)
Fire Blight, Apple Scab, Rust, Plus Others: Be On Alert! - News News
Conditions are optimal for fire blight, apple scab, and rust infections. Growers are encouraged to keep trees protected. Other diseases for the fruit grower radar are also discussed. More
Control for fire blight and apple scab is critical during bloom. (Photo: K. Peter)
Disease Update: Watch Out For Diseases during Apple Bloom - News News
Bloom is well underway in parts of PA and MD. Fire blight and scab disease conditions are in full force now. Growers are encouraged to protect trees. More
Figure 1. Drain plugs must be sealed. Photo: PA Mushroom IPM Handbook
IPM in Mushroom Production: Exclusion Techniques for Pest Control - Articles Articles

IPM in Mushroom Production: Exclusion Techniques for Pest Control

Maria Gorgo-Gourovitch, David Meigs Beyer, Ph.D., John A. Pecchia, Ph.D.

Exclusion prevents the entrance of pest organisms into new rooms and their escape from older ones. The latter should not be underestimated. More
Bacterial Spot of Stone Fruit in Home Fruit Plantings
Bacterial Spot of Stone Fruit in Home Fruit Plantings - Articles Articles
Bacterial spot occurs in most countries where stone fruits are grown. Common hosts include peach, nectarine, prune, plum, and apricot. Other hosts are sweet and tart cherry, almond, and wild peach. More
Bacterial Spot of Tomato: Biology and Management
Bacterial Spot of Tomato: Biology and Management - Articles Articles
Bacterial spot is becoming an increasingly devastating disease of tomato. The pathogen can directly damage the fruit, and severe foliar infection can lead to defoliation. More
Ecological Disease Management
Ecological Disease Management - Articles Articles

Ecological Disease Management

Beth K. Gugino, Ph.D.

In order for a plant to become diseased three conditions must be met: a pathogen, a favorable environment where the pathogen can thrive, and a susceptible host. More