NGUYÊN NHÂN:
Bệnh thán thư: do nấm Collectotrichum gloeoporioides-Lớp:Deuteromycetes
BIỂU HIỆN BỆNH:
Bệnh thán thư là bệnh phổ biến và nguy hiểm nhất đối với cây mãng cầu. Bệnh hại cả trên lá, ngọn, hoa và trái
Trên lá bệnh tạo thành các đốm nâu hình tròn ,xung quanh viền vàng. Trên vết bệnh già có các vòng đen đồng tâm là các ổ bào tử. Trên ngọn, bệnh làm khô búp, hoa và trái non. Trái non bị bệnh thì khô đen và rụng, trái lớn có thể khô đen một phần
Nấm có thể phát triển trong phạm vi nhiệt độ từ 6-32 độ C,thích hợp nhất ở 23-25 độ C, chết ở 45 độ C trong 10 phút. Nấm tồn tại ở dạng bào tử trên tàn dư cây bệnh trong đất. Thời tiết ấm áp và mưa nhiều thuận lợi cho bệnh phát triển gây hại
Biện pháp phòng trừ:
-Thu gom tiêu hủy tàn dư và bộ phận cây bị bệnh
-Khi bệnh xuất hiện phun các thuốc: super khuẩn, Khuẩn vương, DIPCY 750WP,…..
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