SÂU TƠ – “TÊN TRỘM ĐÊM” GÂY HÉO LÁ, MẤT MÙA TRÊN RAU CẢI – Thuốc trừ sâu sinh học,thuốc trừ nấm,thuốc trừ rầy,thuốc diệt chuột

SÂU TƠ – “TÊN TRỘM ĐÊM” GÂY HÉO LÁ, MẤT MÙA TRÊN RAU CẢI

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SÂU TƠ – “TÊN TRỘM ĐÊM” GÂY HÉO LÁ, MẤT MÙA TRÊN RAU CẢI

Posted On February 24, 2017 at 7:50 am by / 903 Comments

Sâu tơ (Plutella xylostella linaeus) là đối tượng gây hại chủ yếu trên cây rau họ hoa thập tự (su hào, bắp cải,…) Sâu tơ thường phát sinh và gây hại từ tháng 10 đến tháng 4 năm sau, làm giảm năng suất và chất lượng rau rõ rệt nếu không được phòng trừ kịp thời.

ĐẶC ĐIỂM SÂU TƠ GÂY HẠI TRÊN CÂY TRỒNG ?
ĐẶC ĐIỂM SÂU TƠ GÂY HẠI TRÊN CÂY TRỒNG ?

ĐẶC ĐIỂM SÂU TƠ GÂY HẠI TRÊN CÂY TRỒNG ?

Trưởng thành sâu tơ nhỏ, thân dài khoảng 6-7mm, sải cánh rộng 12-15mm màu nâu xám, trên cánh có dải màu trắng (ngài đực) và dải màu vàng (ngài cái) chạy từ gốc cánh đến đỉnh cánh, mép ngoài có lông nhỏ dài mịn, khi đậu cánh áp sát thân.

Trứng hình bầu dục màu vàng xanh nhạt, dài khoảng 4-5mm; Sâu non màu xanh nhạt, đẫy sức dài 9-10mm, mỗi đốt đều có lông nhỏ. Nhộng màu vàng nhạt, dài 5-6mm, nhộng được bọc trong kén mỏng màu trắng xốp.

Trưởng thành sâu tơ hoạt động chủ yếu vào ban đêm. Ngài hoạt động mạnh nhất từ chập tối đến nửa đêm. Mỗi ngài cái đẻ trung bình 50-400 quả trứng. Trứng được đẻ phân tán hay thành cụm dưới mặt lá, hai bên gân lá hay chỗ lõm dưới lá.

Sâu non có 4 tuổi, sâu mới nở sống tập trung, từ tuổi 2 trở đi sâu ăn thịt lá để lại biểu bì tạo thành các đốm trong mờ. Ở tuổi lớn sâu bắt đầu ăn  mạnh làm thủng lá chỉ chừa lại gân lá. Đặc biệt sâu tơ là 1 trong những loài sâu có khả năng kháng thuốc cao.

DẤU HIỆU NHẬN BIẾT SÂU TƠ HẠI CÂY ?

DẤU HIỆU NHẬN BIẾT SÂU TƠ HẠI CÂY ?
DẤU HIỆU NHẬN BIẾT SÂU TƠ HẠI CÂY ?

Sâu nhỏ, màu xanh lục nhạt, dài khoảng 1 cm, thân có lằn ngang mờ.

Lá bị thủng lỗ nhỏ li ti, lấm tấm như bị kim châm.

Lá bị xơ xác, chỉ còn gân lá nếu mật số sâu cao.

Ngài đẻ trứng mặt dưới lá, sâu nở ra ăn lá non, cuốn lá hoặc chui vào bẹ.

TÁC HẠI NGHIÊM TRỌNG CỦA SÂU TƠ HẠI CÂY ?

Làm giảm năng suất từ 30–70%, rau không đạt chất lượng thương phẩm.

Gây hại liên tục từ khi cây 2–3 lá thật đến khi thu hoạch.

Dễ gây kháng thuốc nếu dùng thuốc tràn lan, sai cách.

BÀ CON SỬ DỤNG CHU YANG SIN 750EC – HIỆU DRAGONCIN 990 TRỊ SẠCH SÂU TƠ GÂY HẠI TRÊN CÂY TRỒNG

CHU YANG SIN 750EC – HIỆU DRAGONCIN 990 TRỊ SÂU VẼ BÙA, SÂU TƠ

THÀNH PHẦN DRAGONCIN 990

Chlorpyrifos Methyl 55% w/v

Cypermethrin 20% w/v

Phụ gia 25% w/w

CÔNG DỤNG DRAGONCIN 990

CHU YANG SIN 750EC – DRAGONCIN 990
CHU YANG SIN 750EC – DRAGONCIN 990

CHU YANG SIN 750EC – DRAGONCIN 990 là thuốc trừ sâu được sử dụng để kiểm soát nhiều loại côn trùng gây hại trên các loại cây trồng khác nhau.

Được sử dụng để phòng trừ nhiều loại côn trùng gây hại như: Sâu vẽ bùa, rầy xanh, rệp sáp, mọt đục cành, mọt kim, tuyến trùng, ruồi vàng, sâu cuốn lá, muỗi hành, sâu năng, sâu tơ, sâu bay, bọ xít muỗi, rầy trắng,…

Trên nhiều loại cây trồng khác nhau như: sầu riêng, cam, quýt, bưởi, tiêu, cà phê,…

LỜI KẾT:

Bạn có đang bị sâu tơ tấn công vườn cải nhà mình không? Bạn đã dùng cách gì hiệu quả? Cùng chia sẻ để cộng đồng nông dân chúng ta vững tay nghề – khỏe mùa rau nhé!

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