首頁
動態
文章
百科
花園
設置
繁體中文
  

Algal Leaf Spot

Dummer. ゛☀
2017年09月19日
Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. The causal organism is Cephaleuros virescens, a green parasitic alga whose usual hosts are plants with leathery leaves such as cotoneasters, magnolias, hollies, rhododendrons and viburnums. Algal leaf spot is sometimes called green scurf because the spots may have a crusty, fuzzy or flaky appearance.


Symptoms and Diagnosis

Algal leaf spot is characterized by grayish, green, brown or orange cushion-like blotches on the leaf surface. Some hosts may also have diseased twigs and branches that are girdled and stunted with reddish brown fruiting bodies. The spots are generally 1/2 inch or less in diameter although they may coalesce to form larger colonies. Leaf tissue may die beneath the spots and the leaves may yellow and drop prematurely.
Life Cycle

During wet weather, the algae produce spores that are spread by wind and splashing rain. The spores infect leaf tissue causing small, greenish circular spots that may age to light brown or reddish brown. The spots may appear raised and velvety. The algae will overwinter or survive other unfavorable environmental conditions in leaf spots including those on fallen leaves.
Integrated Pest Management Strategies

1. Encourage healthy plants with good cultural techniques. This disease is most damaging on plants that are already slow-growing or weakened.

2. Clean up fallen leaves and remove diseased leaves from the plant. Good sanitation practices will help control this disease.

3. Promote dry leaves by improving air circulation and drainage. If necessary, selectively prune overcrowded vegetation. Avoid spraying water on the leaves.

4. Use fungicidal sprays containing copper if chemical control is necessary
0
0
文章
評論
😀 😁 😂 😄 😆 😉 😊 😋 😎 😍 😘 🙂 😐 😏 😣 😯 😪 😫 😌 😜 😒 😔 😖 😤 😭 😱 😳 😵 😠
* 僅支持 .JPG .JPEG .PNG .GIF
* 圖片尺寸不得小於300*300px
還沒有人評論,快來搶沙發!
剛剛 回复
最新文章
推薦文章
相關文章
2017年09月15日
0
0
2017年09月13日
0
0
2017年09月13日
0
0
舉報反饋

您有什麼意見或建議,歡迎給我們留言。

請輸入內容
下載綠手指APP

掃二維碼,下載綠手指APP,手機上查看更多內容٩(๑>◡<๑)۶

二維碼

打開APP掃二維碼,直接查看他的主頁

切換語言
設置
VIP
退出登錄
分享

分享好文,綠手指(GFinger)養花助手見證你的成長。

請前往電腦端操作

請前往電腦端操作

轉發
插入話題
提醒好友
發布
/
提交成功 提交失敗 最大圖片質量 成功 啊哦!出了點小問題 轉發成功 舉報 轉發 顯示更多 文章 求助 動態 剛剛 回复 邀你一起尬聊! 表情 添加圖片 評論 僅支持 .JPG .JPEG .PNG .GIF 圖片尺寸不得小於300*300px 最少上傳一張圖片 請輸入內容