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Small chlorotic lesions caused by downy mildew on the upper surface of acorn squash. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 16, 2018 - News News
Cucurbit downy mildew is continuing to pick-up speed with many new reports on cucumber in Ohio, New York, and Massachusetts. More
Reduced till straw mulch serving as a barrier between developing pumpkin fruit and bare soil protecting against soilborne pathogens that cause fruit rots. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 9, 2018 - News News
Downy mildew is becoming more widespread on cucumber across Pennsylvania and has been confirmed on cucumbers in Centre, Clinton, Mifflin, Bucks, Lehigh, and Lancaster Counties. More
Downy mildew lesions on pumpkin. Photo: Beth Gugino, Penn State
Vegetable Disease Update: August 1, 2018 - News News
The wet weather is wreaking havoc in many vegetable fields. 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
Angular lesions caused by downy mildew. Photo: Beth Gugino, Penn State
Vegetable Disease Update: July 5, 2018 - News News
Downy mildew has most recently been confirmed on cucumber in southern New Jersey and Maryland. Late blight has been confirmed on tomato in York County and on potato and tomato in southern Lancaster County. More
Irregularly shaped late blight lesion on a tomato leaf with characteristic white sporulation on the underside of the leaf. Photo: Beth Gugino, Penn State
Vegetable Disease Updates for Mid-June 2018 - News News
Downy mildew has been confirmed in Dorchester County MD on cucumber, late blight confirmed on tomato transplants, and there have been a number of reports of poor potato seed emergence. 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
Pepper transplants. Photo: Tom Ford, Penn State
Vegetable - Small Fruit Current Issues: May 18, 2018 - News News
It’s no secret that this spring has been cold and wet across Pennsylvania. On many farms, planting has been delayed as much as three weeks, and many crops already in the ground are developing more slowly than usual. More
Downy mildew on pumpkin. Photo: Beth K. Gugino, Penn State
Vegetable Disease Updates: August 30, 2017 - Articles Articles
Within the past week, there have been three separate reports of downy mildew on jack-o-lantern pumpkin in eastern Virginia. More
Map of cucurbit downy mildew currently reported along the east coast as of 26 July 2017 (cdm.ipmpipe.org).
Vegetable Disease Updates for July 26, 2017 - News News
The rainy weather is not letting up and neither is downy mildew pressure. More
Map of cucurbit downy mildew currently reported along the east coast as of 30 June 2017 (cdm.ipmpipe.org).
Vegetable Disease Updates for June 30, 2017 - News News
Be on the lookout for diseases, as well as timber rot in high tunnel tomatoes, that spread in some of the recent rain events that moved across the Pennsylvania. 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
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
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
Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org
Downy Mildew - Articles Articles

Downy Mildew

Gary W. Moorman, Ph.D.

Downy mildew is the common name for a group of highly specialized obligate parasites of vascular plants. More
Photo by Kathy Demchak.
Strawberry Disease - Gray Mold - Articles Articles
Gray mold, or botrytis blight, Botrytis cinerea, causes a greater loss of strawberry flowers and fruit than any other disease. It is found on green as well as ripening and harvested fruit. More
Grape Disease - Downy Mildew
Grape Disease - Downy Mildew - Articles Articles
Downy mildew, Plasmopara viticola, can infect berries, leaves and young shoots. It occurs wherever it is wet and warm during the growing season. More
stem canker (Leptosphaeria coniothyrium). Photo: Florida Division of Plant Industry , Florida Department of Agriculture and Consumer Services, Bugwood.org
Bramble Disease - Cane Blight - Articles Articles
Cane blight is caused by the fungus Leptosphaeria coniothyrium, which also causes a canker on roses and a fruit rot of apple and pear. More
Botrytis infection at site of feeding damage. Photo by Kathy Demchak.
Bramble Disease - Botrytis - Articles Articles
Botrytis fruit rot or gray mold, Botrytis cinerea, is the most common and most serious disease of Rubus species worldwide. More
Grape Disease - Botrytis Bunch Rot
Grape Disease - Botrytis Bunch Rot - Articles Articles
Botrytis bunch rot, or gray mold, exists in all vineyards worldwide. This disease is caused by the fungus Botrytis cinerea and is commonly associated with the decay of ripe or nearly ripe grapes. More
University of Georgia Plant Pathology, University of Georgia, Bugwood.org
Botrytis Bunch Rot on Grapes in Home Gardens - Articles Articles
Botrytis bunch rot, or gray mold, is commonly associated with the decay of ripe or nearly ripe grapes. Temperature and damp climates favor disease development. More
Botrytis Fruit Rot on Brambles in the Home Garden
Botrytis Fruit Rot on Brambles in the Home Garden - Articles Articles
Botrytis fruit rot or gray mold is the most common and most serious disease of Rubus species worldwide. More
Once established in the wound, the fungus can quickly spread from infected fruit to adjacent healthy fruit during storage. Photo by K. Peter.
Apple and Pear Disease - Gray Mold - Articles Articles

Apple and Pear Disease - Gray Mold

Kari A. Peter, Ph.D.

Gray mold, Botrytis cinerea, is the most important postharvest disease of pears and is second to blue mold in importance to apple. 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
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