Tag: bacteria

Pathogen Profile: Bremia lactucae

Bremia lactucae Introduction Bremia lactucae causes lettuce downy mildew for both indoor and outdoor lettuce. It is a significant pathogen in cooler environments like late-fall seasons and heated winter greenhouses. This plant pathogen is an oomycete, and symptoms of the disease are similar to late blight. However, the disease may appear as white fungal growth […]
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Pathogen Profile: Erwinia tracheiphila

Erwinia tracheiphila Introduction Erwinia tracheiphila is a bacterial pathogen that causes bacterial wilt, a devastating disease affecting cucurbits such as cucumbers, muskmelons, and, to a lesser extent, squash and pumpkins. This disease does not affect watermelons. The economic impact of Erwinia tracheiphila is significant, particularly in the Midwestern and Northeastern United States, where it threatens […]
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Pathogen Profile: Xanthomonas hortorum pv. vitians

Xanthomonas hortorum pv. vitians Introduction Xanthomonas hortorum pv. vitians is a  bacterial pathogen responsible for bacterial leaf spot in lettuce and other leafy vegetables; this pathogen poses a significant challenge to growers worldwide [1]. Bacterial leaf spot can lead to substantial crop yield losses and severe economic consequences. Historically, outbreaks can cause up to 100% […]
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Symptoms of Bacterial spot on a bell pepper fruit.

Pathogen Profile: Xanthomonas euvesicatoria

Xanthomonas euvesicatoria What is Xanthomonas euvesicatoria? Xanthomonas euvesicatoria is a bacterium that causes bacterial spot disease in plants of tomatoes and peppers [1,2]. It is aerobic and has a long tail (flagellum), allowing it to move in water. Please refer to Figure 1 where the flagellum can be seen on the bottom right side of […]
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tomato bacteria Pseudomonas syringae

Pathogen Profile: Pseudomonas syringae

Pseudomonas syringae What is Pseudomonas syringae? The bacteria Pseudomonas syringae is a common plant pathogen mostly found in stems and leaves [1]. It infects a wide range of plants—including fruit trees, greenhouse vegetables, ornamentals, and field crops. Annually, the bacteria cause billions of dollars of damage worldwide from lost fruits, damaged trees, unmarketable ornamentals, and […]
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rhizoctonia tomato stem

Pathogen Profile: Rhizoctonia solani

Rhizoctonia solani What is Rhizoctonia solani? The fungus Rhizoctonia solani is a soilborne pathogen that spreads in wet and warm conditions. It infects many economically vital plants—including greenhouse vegetables, ornamentals, and field crops [1, 2]. Crops affected by this pathogen include peppers, lettuce, potatoes, tomatoes, rice, soybeans, wheat, lilies and turf grass. In fact, it […]
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