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Trả lời B nh cóc trên i có khả n ng trên i có khả n ng

nh ghẻ hoặc b nh rĩ sắt

Trên i có những b nh sau: 1. Bệnh ghẻ do nấm Venturia inaequalis Đ ợc nghi là b nh thối v nh ốm lá trên cây i. B nh xuất hi n trên lá và quả. Mặt d ới là xuất hi n những ốm hình bầu dục màu nâu sẫm ến en, sẩm màu. Trên lá non vết b nh lồi ra, c nh ều. Lá già có viền nâu nh t. Vết b nh có bề mặt lồi lõm xuất hi n cả 2 mặt lá. Khi b nặng phiến lá cong, nhỏ v nh n nheo r i i nhỏ, thô, có vết b nh hình tròn m u en tr n vỏ trái,

2. Bệnh loét trên trái do nấm Pestalotia psidii

3. Bệnh rỉ sắt do nấm Cephaleuros virescens

4. B nh th n th Colletotrichum psidii

Đ phòng ngừ 2 nh tr n ần xử lý hết nguồn nh tr ớ khi trồng mới hoặ s u vụ thu ho h ần ốn tỉ tri t v thu gom hết t n d y nh em tập trung v ốt hết tr nh l y l n hông n n trồng qu d y l m v ờn y thiếu nh s ng; ắt tỉ , t o hình y sinh tr ởng ph t tri n tốt, ộ thông tho ng, tr nh ợ ẩm ộ o trong v ờn D ng vôi ột, F liz n xử lý ất Phun ngừ ằng o ô 1% hoặ lo i thuố trừ nấm gố ồng nh Copper -Zine, Copper- , Oxít loru ồng ph nồng ộ 0,25-0,3%

(pha 25-30 g/ ình 10 lít), enomyl, Zine , Difol t n ở nồng ộ 0,2% s u khi rụng sẽ hi u quả phòng ngừ

nh ho

hi tri u hứng nh xuất hi n hoặ ã g y h i nặng thì n n d ng lo i thuố trừ nấm m nh, tính nội hấp 2 hiều nh Ridomil, liette 80WP, opsin M, ph nồng ộ 0,3% (30g/ ình 10 lít), phun kỹ trong v ngo i t n, phun ớt ẫm to n ộ mặt t n Cần l uýl hợp hất gố ồng th l m l im un u ỏ( giống i m u ỏ nh t t ơng ối ít ngộ ộ hơn) heo khuyến o i n ghi n ứu y n quả miền m, khi tr i i t 2/3 - 3/4 kí h th ớ tối th d ng i n ph p o tr i, vừ h n hế ợ sự g y h i s u nh, giúp tr i m u lớn v giữ ợ m u sắ , mã quả ẹp, n ợ gi o hơn ới giống i quý trong v ờn nh n, vi o tr i ng n n l m vì dễ thự hi n, hi phí thấp m hi u quả l i o C th sử dụng túi nylon ( ắt v i lỗ nhỏ ho tr i hô hấp) hoặ túi giấy huy n dụng n phun một số lo i thuố trừ nấm nh ntr ol 70WP, Topsin M 70WP, Copper-Zin 85WP tr ớ khi o tr i tr i không nhiễm nh s u khi bao.

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