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Posted On March 16, 2017 at 9:02 am by / 2,043 Comments

Bọ xít muỗi đỏ là loại sâu hại nghiêm trọng ở hầu hết các khu vực trồng điều. Bọ xít muỗi đỏ khi trưởng thành có màu nâu đỏ, đầu đen, ngực đỏ, bụng trắng.

Bọ trưởng thành thường hoạt động vào sáng sớm hoặc chiều mát, những ngày âm u ít nắng hoạt động gây hại cả ngày.

Bọ xít muỗi đỏ cái đẻ trứng rải rác hoặc từng cụm 3-4 trứng trên ngọn hoặc lá non. Trứng rất nhỏ, hình bầu dục, màu trắng trong. Một con cái đẻ khoảng 3-5 lần, mỗi lần 10 trứng.

Sau một thời gian trứng nở thành ấu trùng không cánh, mình thon dài, đuôi nhọn màu hồng nhạt. Loại bọ xít này thường xuất hiện lúc cây ra lá non, nụ bông và tập trung cao nhất vào lúc cây trổ bông.

Bọ trưởng thành và ấu trùng dùng vòi chích hút nhựa ở lá non, chồi non, hoa, trái và hạt non. Các vết chích bị chảy nhựa màu trắng trong sau tạo thành những chấm màu đen.

Nhiều vết chích liên kết lại tạo thành vết sẹo, nếu bị nặng thì chồi và hoa sẽ bị chết khô, lá bị xoắn biến dạng. Hạt non bị chích trên vỏ có những đốm vảy màu nâu đen, rụng sớm hoặc giảm kích thước và phẩm chất. Nguy hại hơn là các vết chích là nơi xâm nhập gây hại của một số nấm bệnh.

Cách phòng trừ là vệ sinh vườn điều, dọn sạch cỏ dại, hun khói vào sáng sớm hoặc chiều tối. Khi phát hiện vườn điều bị bệnh thì phun thuốc vào lúc cành non (tháng 10), lúc cây ra bông (tháng 12) và lúc trái non rộ (tháng 2, 3). Chú ý phun thuốc vào lúc sáng sớm, chiều mát mới phát huy được hiệu quả.

Các hoạt chất đặc trị bọ xít muỗi như: Cypermerin (thuốc: Cyperan 10EC, …), Thiamethoxam (thuốc: Actara 25WDG, Anfaza 25WDG, Amira 25WDG, Asara Super 250WDG,…) , Lambda-Cyhalothrin (thuốc: Karate 2.5EC…)

Chú ý:

  1. Khi phun thuốc diệt bọ xít muỗi nên phun vào khoảng 6 giờ sáng hoặc 4 giờ chiều.

  2. Thời điểm thường xuyên thăm vườn để theo dõi và phát hiện bọ xít muỗi là tháng 11 dương lịch trở đi.

  3. Hiện nay nhiều nhà vườn đã áp dụng phương pháp dùng máy phun khói để diệt trừ bọ xít muỗi – một số video phun trình diễn chúng tôi sẽ trình bày ở cuối bài viết này.

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