BỆNH HÉO CÂY CON - DAMPING OFF, RHIZOCTONIA ROOT ROT, CROWN AND BRACE ROOT ROT - AGRICULTURE
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Bệnh Héo Cây Con - Damping Off, Rhizoctonia Root Rot, Crown And Brace Root Rot

BỆNH HÉO CÂY CON – DAMPING OFF, RHIZOCTONIA ROOT ROT, CROWN AND BRACE ROOT ROT

Posted On May 13, 2017 at 12:34 pm by / 120 Comments

Tác nhân gây bệnh:           

Bệnh do nấm Rhizoctonia solani.

Triệu chứng:

        Nấm bệnh tấn công phần thân gần mặt đất, làm cây con héo gục. Gặp điều kiện thích hợp, cây đã lớn cũng bị nhiểm bệnh: rể và thân bị thối. Phần gốc và rể cây có các vết bệnh màu nâu hơi đỏ.

Phòng trừ:

          Phòng  trị bệnh bằng cách: cày phơi đất, Khử đất bằng thuốc Kitazin hoặc Dinazin, khử hạt, tránh đọng nước trong ruộng bắp, có thể phun thuốc Copper Zinc, Kitazin , Dinazin hoặc Validacin vào gốc cây.
Biện pháp luân canh hầu như không mang lại hiệu quả trong việc phòng trị bệnh nầy

Chu trình:

           Trong môi trường PDA, nấm bệnh tạo ra các khuẩn lạc (colonies) lúc đầu không màu, sau đó có màu nâu. Tế bào sợi nấm có kích thước: độ lớn 5-11 micron và độ dài lên đến 25 micron. Các nhánh sợi nấm mới được thành lập ở những góc thích hợp của tế bào, các nhánh sợi sẽ thắt lại ở điểm phát sinh, và ngăn vách ngay trên điểm thắt nầy. Mầm bệnh lưu tồn trong đất, trong xác cây bệnh, và có khả năng biến động rất cao.
Mặc dù hạt có mức độ nhiểm bệnh cao, nhưng chưa có bằng chứng nào cho thấy rằng mầm bệnh từ hạt sẽ lan truyền sang cây con.

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