常見的葉斑病的症狀可以出現在葉子、果實、果蒂、葉柄和匍匐莖上。這種疾病最明顯的症狀是草莓葉子上的小型、圓形、壞死（即死亡）斑點。最初，這些斑點在葉子的上表面上形成，呈深紫色到紅色。斑點最終發展為具有明顯紅紫色到棕色邊界的淺褐色、灰色或幾乎白色中心。在溫暖潮濕的天氣下，可能出現均勻的鐵鏽褐色斑點，而沒有紫色邊界或淺色中心。斑點也可能出現在葉子的背面，但這些斑點的顏色通常較不鮮艷。隨著疾病的進展，斑點會變大，直徑可達1/8到1/4英寸，並且可能相互融合，在極端情況下導致葉子死亡。果蒂、葉柄和匍匐莖上的斑點與上表面的斑點相似。感染的果實上可能會出現淺黑色斑點（直徑1/4英寸），並且通常被棕色或黑色的皮膚組織所包圍。
常見的葉斑病是由真菌Mycospharella fragariae引起的，它可以通過感染的草莓植物或來自附近草莓的風吹散播的孢子進入花園。一旦進入花園，這種真菌主要通過雨水或灑水濺起的水滴傳播。當溫度在65°F至75°F之間，且有高降雨和濕度時，M. fragariae最活躍。M. fragariae在冬季存活在死去的草莓葉子和其他植物部分上，並在春季由早期雨水帶到新的葉子上。
一常見的草莓葉斑病是由真菌Mycospharella fragariae引起的。這種真菌可以通過感染的草莓植物或來自附近草莓的風吹散播的孢子進入花園。一旦進入花園，它主要通過雨水或灑水濺起的水滴傳播。
常見的葉斑病是一種常見的草莓葉部真菌病，全球野生和栽培的草莓都會受到影響。過去這種病害曾是最具經濟價值的草莓病害，但現在使用抗病性較強的草莓品種和改進種植方法已經有效地控制了這種疾病，減少了其對產量和果實品質的影響。如今，常見的葉斑病通常只是一個外觀問題，對果實產量和品質影響不大。
常見的葉斑病的症狀可以出現在葉子、果實、果蒂、葉柄和匍匐莖上。最明顯的症狀是草莓葉子上的小型圓形壞死斑點。這些斑點最初在葉子的上表面形成，呈深紫色到紅色。隨著時間的推移，斑點中心變成淺褐色、灰色或幾乎白色，周圍則是明顯的紅紫色到褐色邊界。在溫暖潮濕的天氣下，斑點可能呈均勻的鐵鏽褐色，沒有紫色邊界或淺色中心。斑點也可能出現在葉子的背面，但顏色通常不那麼鮮豔。病情惡化時，斑點會變大，直徑可達1/8到1/4英寸，有時甚至會相互融合，極端情況下可能導致葉子死亡。果蒂、葉柄和匍匐莖上的斑點與葉子上的斑點類似。感染的果實上可能會出現直徑為1/4英寸的淺黑色斑點，通常被棕色或黑色的硬皮組織所包圍。
常見的葉斑病是由真菌Mycospharella fragariae引起的，它可以通過感染的草莓植物或來自附近草莓的風吹散播的孢子進入花園。一旦進入花園，這種真菌主要通過雨水或灑水濺起的水滴傳播。M. fragariae在溫度在65°F至75°F之間、降雨量和濕度較高的環境中最活躍。它在冬季可以在死去的草莓葉子和其他植物部分上存活，並在春季的早期雨水中傳播到新的
折疊內容
Common leaf spot is caused by the fungus Mycospharella fragariae, which can enter a garden on infected strawberry plants or via windblown spores from nearby strawberries. Once introduced into a garden, the fungus is spread predominantly by splashing water from rain or sprinklers used for watering.Oct 14, 2016
Articles > Diseases & Disorders
Common leaf spot of Strawberry
John Hammel, UW-Madison Plant Pathology
Item Number: XHT1236
Revised: 10/14/2016
What is common leaf spot? Common leaf spot of strawberry (also known as Mycosphaerella leaf spot, Ramularia leaf spot, strawberry leaf spot, bird’s-eye spot, gray spotness, and white spot) is a common fungal leaf disease that affects both wild and cultivated strawberries throughout the world. Common leaf spot was once the most economically important strawberry disease, but the use of resistant strawberry varieties/cultivars and improvements in methods for growing strawberries have been effective in managing the disease and reducing its impact. Today, the disease is often a cosmetic problem and typically has little impact on yield or fruit quality.
What does common leaf spot look like? Symptoms of common leaf spot can occur on leaves, fruits, berry caps, petioles, and runners. The most noticeable symptoms of the disease are small, round, necrotic (i.e., dead) spots on strawberry leaves. Initially, these spots develop on the upper leaf surface and are deep purple to red in color. The spots eventually develop tan, gray or almost white centers with distinct reddish-purple to brown borders. During warm, humid weather, uniformly rusty-brown spots without purple margins or light colored centers may develop instead. Spots can occur on the undersides of the leaves as well, but these spots tend to be less vibrant in color. As the disease progresses, spots enlarge to ⅛ to ¼ inch in diameter and may merge together, in extreme cases leading to leaf death. Spots on berry caps, petioles, and runners resemble those produced on upper leaf surfaces. Shallow, black spots (¼ inch in diameter) may develop on infected fruits, and are often surrounded by brown or black, leathery tissue.
Where does common leaf spot come from? Common leaf spot is caused by the fungus Mycospharella fragariae, which can enter a garden on infected strawberry plants or via windblown spores from nearby strawberries. Once introduced into a garden, the fungus is spread predominantly by splashing water from rain or sprinklers used for watering. M. fragariae is most active when temperatures range from 65°F to 75°F, with periods of high rainfall and humidity. M. fragariae survives the winter on dead strawberry leaves and other plant parts, and is moved to new foliage in the spring by early season rains.
How do I save strawberry plants with common leaf spot? Once common leaf spot develops on strawberry plants, the plants cannot be cured. If the disease is detected early, its development may be slowed using fungicides. Keep in mind however, that common leaf spot is often merely a cosmetic issue and the use of fungicides may not be warranted. If you decide that fungicide treatments are needed, select a product that is labeled for use on strawberries and that contains captan, myclobutanil or copper as the active ingredient. Use copper-containing fungicides only prior to flowering. If you decide to use a myclobutanil-containing product, alternate applications of this product with applications of a second fungicide containing another active ingredient. This will help prevent selection of myclobutanil-resistant variants of the common leaf spot pathogen. Be sure to read and follow all instructions on the label(s) of the fungicide(s) that you select to ensure that you use the product(s) in the safest and most effective ma
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