BỆNH BẠC LÁ TRÊN LÚA – “SÁT THỦ” THẦM LẶNG TRÊN ĐỒNG RUỘNG – Thuốc trừ sâu sinh học,thuốc trừ nấm,thuốc trừ rầy,thuốc diệt chuột

BỆNH BẠC LÁ TRÊN LÚA – “SÁT THỦ” THẦM LẶNG TRÊN ĐỒNG RUỘNG

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BỆNH BẠC LÁ TRÊN LÚA – “SÁT THỦ” THẦM LẶNG TRÊN ĐỒNG RUỘNG

Posted On February 24, 2017 at 7:41 pm by / 275 Comments

Khi ruộng lúa xanh tốt bước vào giai đoạn làm đòng – trổ, cũng là lúc một loại bệnh nguy hiểm bắt đầu tấn công âm thầm: BỆNH BẠC LÁ, còn gọi là cháy bìa lá hay cháy lá vi khuẩn. Bệnh này không chỉ khiến lúa mất màu, vàng úa, mà còn có thể làm thất thu đến 70% năng suất nếu không xử lý kịp thời

NGUYÊN NHÂN GÂY BỆNH BẠC LÁ TRÊN LÚA ?

NGUYÊN NHÂN GÂY BỆNH BẠC LÁ TRÊN LÚA ?
NGUYÊN NHÂN GÂY BỆNH BẠC LÁ TRÊN LÚA ?

Tác nhân: Vi khuẩn Xanthomonas oryzae pv. oryzae.

Vi khuẩn xâm nhập qua vết thương cơ học, côn trùng chích hút hoặc qua khí khổng, phát triển mạnh trong điều kiện nhiệt độ 25–34°C, độ ẩm cao, ruộng nhiều đạm.

DẤU HIỆU NHẬN BIẾT BỆNH BẠC LÁ TRÊN LÚA ?

DẤU HIỆU NHẬN BIẾT BỆNH BẠC LÁ TRÊN LÚA ?
DẤU HIỆU NHẬN BIẾT BỆNH BẠC LÁ TRÊN LÚA ?

Giai đoạn đầu (cháy bìa lá):

  • Mép lá bắt đầu ngả vàng, sau đó chuyển trắng bạc từ mép vào giữa lá.
  • Xuất hiện dọc theo gân chính, vết bệnh loang dần, lá quăn nhẹ, khô tóp lại như bị cháy nắng.

Giai đoạn nặng (toàn lá bị bạc):

  • Cả phiến lá bị bạc trắng, lúa không thể quang hợp, ảnh hưởng nghiêm trọng đến trổ đòng và vào hạt.
  • Nếu bệnh xuất hiện sớm, ruộng lúa lùn xịt, không đòng hoặc đòng rất nhỏ.

ĐIỀU KIỆN BỆNH BẠC LÁ TRÊN LÚA ?

Thời tiết nóng ẩm, mưa nhiều sau giai đoạn bón đạm.

Ruộng bón thừa phân đạm, dày cây, kém thoáng khí.

Lúa bị sâu cuốn lá, rầy nâu, bọ trĩ gây vết thương tạo điều kiện cho vi khuẩn xâm nhập.

Sử dụng giống mẫn cảm, không luân canh.

TÁC HẠI NGHIÊM TRỌNG BỆNH BẠC LÁ TRÊN LÚA ?

Giảm khả năng quang hợp → giảm năng suất rõ rệt.

Hạt lép, đòng không trổ hoặc trổ không đều.

Nếu phát hiện muộn → ruộng có thể mất trắng.

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Chất phụ gia 25% w/w

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Đặc trị: Bệnh đạo ôn ( cháy lá ) lúa do nấm Pyricularia oryzae.

Thuốc trừ nấm bệnh tính nội hấp, lưu dẫn sâu vào bên trong cây lúa, hiệu quả cao đối với bệnh đạo ôn lá (cháy lá) và đạo ôn cổ bông ( thối cổ gié) gây hại trên lúa.

Bền vững trong môi trường sau khi phun 1 giờ nếu gặp mưa cũng không giảm hiệu lực. Thuốc có tác dụng phòng trị bệnh kéo dài, hạn chế công phun xịt.

Hạt cốm, ưu điểm khi hòa vào nước, thuốc sẽ phân tán nhanh đều trong nước. Lượng thuốc sử dụng thấp, tiết kiệm chi phí.

LỜI KẾT:

“Bệnh bạc lá không chỉ làm lúa bạc đầu mà còn làm nhà nông bạc mặt nếu lơ là phòng trị!” Hãy kiểm tra ruộng thường xuyên, bón phân hợp lý, xử lý ngay khi thấy lá có dấu hiệu ngả màu – đó là cách bảo vệ năng suất và túi tiền của bạn!

Bà con còn thắc mắc gì vui lòng liên hệ về hotline 0984.535.820 để được đội ngũ kỹ sư tư vấn miễn phí hoặc liên hệ Website vietnamnongnghiepsach.com.vn. Chúc quý bà con có một vụ mùa bội thu !

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