rang, doi khi c6 quang mo bj vang xuat hien tren phan mo chua bj benh.Ooi khi nhQng dom benh mau nau hinh tron hoac goc canh hien dien tren ban la vdi cau true 6 benh nho. Trieu chufng tren trai, than, va canh rat kho nhan dien va chua duoc mo ta.Tac hai cua benh la gay rung la hang loat, lam giam dien tich Cjuang hop, huthoi la non, choi non, va thoi hoa va chum hoa.
Vet benh thudng xuat hien tqi duoi la gay chay kho vdi ranh gidi vung benh ro rang, doi khi c6 vung mo mau vang
Tac nhan gay benh va dac diem gay benh
Do nam Colletotrichum gloeosporioides gay ra va cau true 6 benh phat hien de dang tren m o la b e n h . Jayakumar va cs (2009) t i m thay m o t loai Colletotrichum mdi chua duoc m o ta tai cac v u n g ho tieu An Do. Dac d i e m gay benh lien quan den am d o vUdn tieu va so ngay mUa, bao tCr nam lay Ian qua gio, con t r u n g , gipt nUdc mUa.Theo nUdc bao tCf t h u d n g ti'ch t u tai c h o p la tieu vi vay trieu chCrng benh t h u d n g xuat hien ban dau tai vj tri nay sau do phat trien Ian rpng len ban la. Nam t o n luu tren la benh kho v6i nhieu 6 bao tCr ma tCr do bao tCf phat tan gay benh khi am d o cao. Vi vay t h u g o m la benh va ve sinh vUcrn se g i u p giam n g u o n benh tfch luy. Cay tieu bj vang la t h u d n g kem t h e o trieu chiJng chay la gay rung la lam t r d canh va k h u n g tan cay.
Cdu true bao tCrcua Colletotrichum spp. Hinh 34: Cay ho tieu bj benh vang Id
vdi dang c6 gai cCtng va khong c6 gai va than thUv&i vet benh tai chop Id
Hinh 33 b: Benh than thvttren cay ho tieu
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