{"id":490,"date":"2005-07-16T07:32:38","date_gmt":"2005-07-16T07:32:38","guid":{"rendered":"http:\/\/vafs.dungnq.local\/2005\/07\/16\/ap-dung-ky-thuat-lam-sinh-de-giam-thieu-thiet-hai-do-benh-phan-hong-gay-ra-tren-rung-trong-keo-lai\/"},"modified":"2019-09-24T11:06:54","modified_gmt":"2019-09-24T04:06:54","slug":"ap-dung-ky-thuat-lam-sinh-de-giam-thieu-thiet-hai-do-benh-phan-hong-gay-ra-tren-rung-trong-keo-lai","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/ap-dung-ky-thuat-lam-sinh-de-giam-thieu-thiet-hai-do-benh-phan-hong-gay-ra-tren-rung-trong-keo-lai\/","title":{"rendered":"\u00c1P D\u1ee4NG K\u1ef8 THU\u1eacT L\u00c2M SINH \u0110\u1ec2 GI\u1ea2M THI\u1ec2U THI\u1ec6T H\u1ea0I DO B\u1ec6NH PH\u1ea4N H\u1ed2NG G\u00c2Y RA TR\u00caN R\u1eeaNG TR\u1ed2NG KEO LAI"},"content":{"rendered":"

Nguy\u1ec5n Th\u1ecb L\u1ec1, Ph\u1ea1m Th\u1ebf D\u0169ng<\/b> <\/i><\/p>\n

Ph\u00e2n vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Nam B\u1ed9<\/i><\/p>\n

Vi\u1ec7n Khoa h\u1ecdc L\u00e2m nghi\u1ec7p Vi\u1ec7t <\/i>Nam<\/i><\/p>\n

Trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng keo lai (gi\u1ed1ng lai t\u1ef1 nhi\u00ean) gi\u1eefa keo tai t\u01b0\u1ee3ng (Acacia mangium)<\/i> v\u00e0 keo l\u00e1 tr\u00e0m (Acacia auriculiformis) <\/i>c\u00f3 r\u1ea5t nhi\u1ec1u tri\u1ec3n v\u1ecdng v\u00e0 \u0111ang kh\u1eb3ng \u0111\u1ecbnh \u0111\u01b0\u1ee3c vai tr\u00f2 c\u1ee7a lo\u00e0i c\u00e2y n\u00e0y trong c\u01a1 c\u1ea5u c\u00e2y tr\u1ed3ng ch\u00ednh l\u00e0m nguy\u00ean li\u1ec7u gi\u1ea5y. Do c\u00f3 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m \u01b0u vi\u1ec7t v\u1ec1 t\u1ef7 l\u1ec7 s\u1ed1ng cao, kh\u1ea3 n\u0103ng sinh tr\u01b0\u1edfng nhanh, chu k\u1ef3 kinh doanh ng\u1eafn (7-8 n\u0103m), t\u00ednh th\u00edch nghi c\u0169ng nh\u01b0 t\u00e1c d\u1ee5ng c\u1ea3i thi\u1ec7n \u0111\u1ed9 ph\u00ec \u0111\u1ea5t cao, keo lai \u0111\u00e3 v\u00e0 \u0111ang mang l\u1ea1i hi\u1ec7u qu\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb kinh t\u1ebf v\u00e0 sinh th\u00e1i m\u00f4i tr\u01b0\u1eddng. Tuy nhi\u00ean, m\u1ed9t s\u1ed1 khu r\u1eebng tr\u1ed3ng keo lai c\u00f3 m\u1eadt \u0111\u1ed9 tr\u1ed3ng t\u1eeb 1100 \u20131600c\u00e2y\/ha, c\u00e2y sinh tr\u01b0\u1edfng t\u1ed1t trong nh\u1eefng n\u0103m \u0111\u1ea7u, nh\u01b0ng khi 3 \u2013 4 n\u0103m tu\u1ed5i, r\u1eebng b\u1eaft \u0111\u1ea7u kh\u00e9p t\u00e1n, b\u1ec7nh h\u1ea1i \u0111\u00e3 b\u1eaft \u0111\u1ea7u xu\u1ea5t hi\u1ec7n l\u00e0m \u1ea3nh h\u01b0\u1edfng x\u1ea5u \u0111\u1ebfn n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng. \u0110\u1ec3 c\u00f3 c\u01a1 s\u1edf khoa h\u1ecdc cho vi\u1ec7c khuy\u1ebfn c\u00e1o \u00e1p d\u1ee5ng nh\u1eefng bi\u1ec7n ph\u00e1p l\u00e2m sinh nh\u1eb1m gi\u1ea3m thi\u1ec3u thi\u1ec7t h\u1ea1i g\u00e2y ra tr\u00ean r\u1eebng tr\u1ed3ng keo lai, ch\u00fang t\u00f4i ti\u1ebfn h\u00e0nh \u0111i\u1ec1u tra t\u1ef7 l\u1ec7 h\u1ea1i tr\u00ean khu th\u00ed nghi\u1ec7m m\u1eadt \u0111\u1ed9 r\u1eebng tr\u1ed3ng.<\/p>\n

Khu v\u1ef1c nghi\u00ean c\u1ee9u t\u1ea1i Tr\u1ea1m th\u1ef1c nghi\u1ec7m L\u00e2m nghi\u1ec7p T\u00e2n L\u1eadp, huy\u1ec7n \u0110\u1ed3ng Ph\u00fa, t\u1ec9nh B\u00ecnh Ph\u01b0\u1edbc, v\u00e0 \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh t\u1eeb th\u00e1ng 6 -12 n\u0103m 2003.<\/p>\n

Kh\u00ed h\u1eadu c\u1ee7a v\u00f9ng l\u00e0 nhi\u1ec7t \u0111\u1edbi n\u00f3ng \u1ea9m v\u1edbi nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh h\u00e0ng n\u0103m 27,3\u00b0C v\u1edbi \u0111\u1ed9 \u1ea9m trung b\u00ecnh h\u00e0ng n\u0103m 81,2% v\u1edbi bi\u1ebfn \u0111\u1ed9ng theo m\u00f9a nh\u1ecf. T\u1ed5ng l\u01b0\u1ee3ng m\u01b0a trung b\u00ecnh h\u00e0ng n\u0103m l\u00e0 2.686mm (t\u1eeb 2333 \u0111\u1ebfn 2900mm), t\u1ed5ng l\u01b0\u1ee3ng b\u1ed1c h\u01a1i h\u00e0ng n\u0103m 28 mm. M\u00f9a m\u01b0a t\u1eeb th\u00e1ng 5 \u0111\u1ebfn th\u00e1ng 11 v\u00e0 m\u00f9a kh\u00f4 t\u1eeb th\u00e1ng 12 \u0111\u1ebfn th\u00e1ng 4.<\/p>\n

1. M\u1ee4C TI\u00caU NGHI\u00caN C\u1ee8U<\/h1>\n

– X\u00e1c \u0111\u1ecbnh t\u00e1c nh\u00e2n g\u00e2y b\u1ec7nh r\u1eebng tr\u1ed3ng keo lai.<\/p>\n

– X\u00e1c \u0111\u1ecbnh \u1ea3nh h\u01b0\u1edfng c\u1ee7a m\u1eadt \u0111\u1ed9 tr\u1ed3ng keo lai \u0111\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i c\u1ee7a hai d\u00f2ng keo lai tuy\u1ec3n ch\u1ecdn.<\/p>\n

– Th\u1eed nghi\u1ec7m m\u1ed9t s\u1ed1 lo\u1ea1i thu\u1ed1c nh\u1eb1m gi\u1ea3m thi\u1ec3u t\u00e1c h\u1ea1i c\u1ee7a b\u1ec7nh.<\/p>\n

2. N\u1ed8I DUNG, \u0110\u1ed0I T\u01af\u1ee2NG V\u00c0 PH\u01af\u01a0NG PH\u00c1P NGHI\u00caN C\u1ee8U<\/h1>\n

2.1. N\u1ed9i dung nghi\u00ean c\u1ee9u <\/b><\/p>\n

X\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n g\u00e2y b\u1ec7nh r\u1eebng tr\u1ed3ng keo lai.<\/p>\n

\u0110i\u1ec1u tra t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i theo c\u00e1c m\u1eadt \u0111\u1ed9 tr\u1ed3ng kh\u00e1c nhau c\u1ee7a hai d\u00f2ng keo lai \u0111\u01b0\u1ee3c tuy\u1ec3n ch\u1ecdn.<\/p>\n

Th\u1eed nghi\u1ec7m c\u00e1c lo\u1ea1i thu\u1ed1c tr\u1eeb b\u1ec7nh h\u1ea1i cho hai d\u00f2ng keo lai.<\/p>\n

2.2. \u0110\u1ed1i t\u01b0\u1ee3ng v\u00e0 v\u1eadt li\u1ec7u nghi\u00ean c\u1ee9u <\/b><\/p>\n

– \u0110\u1ed1i t\u01b0\u1ee3ng nghi\u00ean c\u1ee9u l\u00e0 r\u1eebng tr\u1ed3ng keo lai b\u1eb1ng hom 3 n\u0103m tu\u1ed5i c\u00f3 m\u1eadt \u0111\u1ed9 tr\u1ed3ng nh\u01b0 sau:<\/p>\n\n\n\n\n\n
TT<\/b><\/td>\nK\u00fd hi\u1ec7u d\u00f2ng keo lai<\/b><\/td>\nM\u1eadt \u0111\u1ed9 tr\u1ed3ng, c\u00e2y \/ha<\/b><\/td>\nC\u1ef1 li tr\u1ed3ng, m<\/b><\/td>\n<\/tr>\n
1<\/td>\nPV03<\/td>\n1111<\/p>\n

1428<\/td>\n

3 x 3<\/p>\n

3,5 x 2<\/td>\n<\/tr>\n

2<\/td>\nTB06<\/td>\n1111<\/p>\n

1428<\/td>\n

3 x 3<\/p>\n

3,5 x 2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

– Thu\u1ed1c tr\u1eeb b\u1ec7nh d\u00f9ng trong th\u1eed nghi\u1ec7m :<\/p>\n

+ Thu\u1ed1c Dethamin M \u201345 n\u1ed3ng \u0111\u1ed9 s\u1eed d\u1ee5ng 0,1%.<\/p>\n

+ Thu\u1ed1c Bordeaux 1% (CuSO\u00ad4<\/sub>:CaO:H2<\/sub>O = 1:2:10).<\/p>\n

2.3. Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/h2>\n

<\/h2>\n

– Th\u1ef1c hi\u1ec7n n\u1ed9i dung NC 1: X\u00e1c \u0111\u1ecbnh t\u00e1c nh\u00e2n g\u00e2y b\u1ec7nh th\u00f4ng qua m\u00f4 t\u1ea3 tri\u1ec7u ch\u1ee9ng b\u1ec7nh h\u1ea1i ngo\u00e0i hi\u1ec7n tr\u01b0\u1eddng. Quan s\u00e1t v\u00e0 m\u00f4 t\u1ea3 t\u1ed5 ch\u1ee9c b\u1ec7nh trong ph\u00f2ng th\u00ed nghi\u1ec7m b\u1eb1ng k\u00ednh l\u00fap c\u1ea7m tay. Thu th\u1eadp m\u1eabu \u0111i\u1ec3n h\u00ecnh quan s\u00e1t s\u1ee3i n\u1ea5m, c\u01a1 quan sinh s\u1ea3n c\u1ee7a n\u1ea5m t\u1ea1i ph\u00f2ng th\u00ed nghi\u1ec7m b\u1eb1ng k\u00ednh hi\u1ec3n vi soi n\u1ed5i v\u00e0 k\u00ednh hi\u1ec3n vi quang h\u1ecdc.<\/h2>\n

– Th\u1ef1c hi\u1ec7n n\u1ed9i dung NC 2: S\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p \u0111i\u1ec1u tra t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i tr\u00ean th\u00ed nghi\u1ec7m v\u1ec1 m\u1eadt \u0111\u1ed9 tr\u1ed3ng r\u1eebng cho hai d\u00f2ng keo lai l\u00e0 PVO3, TBO6. Di\u1ec7n t\u00edch khu v\u1ef1c th\u00ed nghi\u1ec7m l\u00e0 12.960m2<\/sup> (240 x 54 m). M\u1ed7i d\u00f2ng c\u00f3 di\u1ec7n t\u00edch 6.480m2<\/sup>. Di\u1ec7n t\u00edch \u00f4 ti\u00eau chu\u1ea9n kh\u1ea3o s\u00e1t 450m2<\/sup> \u0111\u1ed1i v\u1edbi m\u1eadt \u0111\u1ed9 1111c\/ha v\u00e0 350m2<\/sup> \u0111\u1ed1i v\u1edbi m\u1eadt \u0111\u1ed9 1428c\u00e2y\/ha. S\u1ed1 c\u00e2y \u0111i\u1ec1u tra c\u00f3 trong \u00f4 ti\u00eau chu\u1ea9n l\u00e0 50 c\u00e2y. Th\u00ed nghi\u1ec7m l\u1eb7p l\u1ea1i 3 l\u1ea7n. Thu th\u1eadp s\u1ed1 li\u1ec7u 3 l\u1ea7n v\u00e0o c\u00e1c th\u00e1ng 7; 9; v\u00e0 12.<\/p>\n

– Th\u1ef1c hi\u1ec7n n\u1ed9i dung NC 3: Kh\u1ea3o nghi\u1ec7m hai lo\u1ea1i thu\u1ed1c tr\u00ean hai khu tr\u1ed3ng c\u00f3 m\u1eadt \u0111\u1ed9 tr\u1ed3ng v\u00e0 d\u00f2ng keo lai kh\u00e1c nhau. Thu th\u1eadp s\u1ed1 li\u1ec7u: theo d\u00f5i tr\u01b0\u1edbc khi x\u1eed l\u00fd thu\u1ed1c 1 ng\u00e0y sau khi x\u1eed l\u00fd thu\u1ed1c 15 ng\u00e0y; 1 th\u00e1ng; v\u00e0 2 th\u00e1ng.<\/p>\n

Thu\u1ed1c Dethamin M\u201345 n\u1ed3ng \u0111\u1ed9 s\u1eed d\u1ee5ng 9ml% phun x\u1ecbt v\u00f2ng quanh v\u1ebft b\u1ec7nh theo h\u01b0\u1edbng t\u1eeb d\u01b0\u1edbi l\u00ean.<\/p>\n

Thu\u1ed1c Bordeaux 1% (CuSO\u00ad4<\/sub>:CaO:H2<\/sub>O = 1:2:10) qu\u00e9t v\u00f2ng quanh v\u1ebft b\u1ec7nh b\u1eb1ng ch\u1ed5i b\u00f4ng c\u1ecf v\u00e0 qu\u00e9t t\u1eeb d\u01b0\u1edbi l\u00ean.<\/p>\n

Ch\u1ec9 ti\u00eau \u0111\u00e1nh gi\u00e1 b\u1ec7nh h\u1ea1i: Ch\u1ec9 ti\u00eau \u0111\u00e1nh gi\u00e1 b\u1ec7nh h\u1ea1i l\u00e0 t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1itr\u00ean c\u00e1c \u00f4 th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c k\u00fd hi\u1ec7u v\u00e0 t\u00ednh theo c\u00f4ng th\u1ee9c sau:<\/p>\n

T\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i T = S\u1ed1 c\u00e2y b\u1ecb h\u1ea1i \/ T\u1ed5ng s\u1ed1 c\u00e2y \u0111i\u1ec1u tra (%)<\/p>\n

3. K\u1ebeT QU\u1ea2 NGHI\u00caN C\u1ee8U<\/b><\/p>\n

3.1.<\/b>Nguy\u00ean nh\u00e2n g\u00e2y b\u1ec7nh<\/b><\/p>\n

– Tri\u1ec7u ch\u1ee9ng c\u1ee7a b\u1ec7nh: B\u1ec7nh do m\u1ed9t lo\u1ea1i n\u1ea5m k\u00fd sinh v\u1ecf c\u00e2y v\u00e0 th\u00e2n c\u00e2y th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n v\u00e0o \u0111\u1ea7u m\u00f9a m\u01b0a. V\u1ebft b\u1ec7nh d\u1ec5 nh\u1eadn b\u1eb1ng m\u1eaft th\u01b0\u1eddng l\u00e0 c\u00e1c \u0111\u00e1m m\u00e0u tr\u1eafng xu\u1ea5t hi\u1ec7n tr\u00ean b\u1ec1 m\u1eb7t v\u1ecf th\u00e2n c\u00e2y hay \u1edf c\u00e0nh l\u1edbn. V\u1ecb tr\u00ed g\u00e2y b\u1ec7nh th\u01b0\u1eddng \u1edf 2\/3 chi\u1ec1u cao th\u00e2n c\u00e2y, n\u01a1i th\u00e2n hay c\u00e0nh b\u1ecb che b\u00f3ng.<\/p>\n

– Quan s\u00e1t b\u1eb1ng k\u00ednh l\u00fap c\u1ea7m tay n\u01a1i b\u1ecb b\u1ec7nh c\u00f3 nhi\u1ec1u s\u1ee3i n\u1ea5m nh\u1ecf m\u00e0u tr\u1eafng m\u1ecdc tr\u00ean b\u1ec1 m\u1eb7t v\u1ecf c\u00e2y. Giai \u0111o\u1ea1n sau, s\u1ee3i n\u1ea5m \u0103n s\u00e2u v\u00e0o l\u1edbp v\u1ecf h\u00ecnh th\u00e0nh n\u00ean nh\u1eefng m\u1ee5n nh\u1ecf m\u00e0u h\u1ed3ng da cam. \u0110\u1ebfn cu\u1ed1i m\u00f9a m\u01b0a, l\u1edbp m\u00e0u h\u1ed3ng da cam nh\u1ea1t d\u1ea7n v\u00e0 tr\u1edf n\u00ean m\u00e0u tr\u1eafng b\u1ea9n. V\u1ecf c\u00e2y b\u1ecb n\u1ee9t ra, s\u1ee3i n\u1ea5m x\u00e2m nh\u1eadp v\u00e0o th\u00e2n c\u00e2y. L\u00e1 c\u00e2y t\u1eeb ch\u1ed7 b\u1ecb nhi\u1ec5m b\u1ec7nh l\u00ean \u0111\u1ebfn ng\u1ecdn b\u1ecb h\u00e9o, c\u00e2y b\u1ecb n\u1eb7ng khi c\u00f3 gi\u00f3 l\u1edbn d\u1ec5 d\u00e0ng b\u1ecb g\u00e3y n\u01a1i b\u1ecb b\u1ec7nh, th\u00f4ng th\u01b0\u1eddng c\u00e2y kh\u00f4ng ch\u1ebft nh\u01b0ng t\u1eeb \u0111\u00f3 m\u1ecdc ra c\u00e1c ch\u1ed3i m\u1edbi.<\/p>\n

– K\u1ebft qu\u1ea3 ph\u00e2n lo\u1ea1i v\u00e0 x\u00e1c \u0111\u1ecbnh t\u00ean lo\u1ea1i n\u1ea5m trong ph\u00f2ng th\u00ed nghi\u1ec7m cho th\u1ea5y t\u00ean b\u1ec7nh \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 B\u1ec7nh ph\u1ea5n h\u1ed3ng<\/i> . Nguy\u00ean nh\u00e2n g\u00e2y b\u1ec7nh do n\u1ea5m Corticium salmonicolor,<\/i>m\u1ed9t lo\u1ea1i n\u1ea5m k\u00fd sinh v\u00e0 g\u00e2y b\u1ec7nh v\u1edbi nhi\u1ec1u lo\u00e0i c\u00e2y ch\u1ee7 nh\u01b0 b\u1ea1ch \u0111\u00e0n, keo, \u0111i\u1ec1u \u2026. Lo\u00e0i n\u1ea5m n\u00e0y th\u01b0\u1eddng x\u00e2m nhi\u1ec5m v\u00e0o c\u00e0nh v\u00e0 th\u00e2n c\u00e2y xuy\u00ean qua l\u1edbp v\u1ecf ph\u00e1 h\u1ee7y t\u1ea7ng libe l\u00e0m ch\u1ebft c\u00e0nh v\u00e0 ng\u1ecdn c\u00e2y t\u1eeb v\u1ecb tr\u00ed x\u00e2m nhi\u1ec5m. N\u1ea5m g\u00e2y b\u1ec7nh m\u1ea1nh \u1edf nh\u1eefng v\u00f9ng nhi\u1ec7t \u0111\u1edbi, c\u1eadn nhi\u1ec7t \u0111\u1edbi. B\u1ec7nh ph\u1ea5n h\u1ed3ng th\u01b0\u1eddng g\u00e2y b\u1ec7nh cho c\u00e2y tr\u1ed3ng \u1edf nh\u1eefng v\u00f9ng c\u00f3 l\u01b0\u1ee3ng m\u01b0a cao (2000 mm\/n\u0103m) v\u00e0 xu\u1ea5t hi\u1ec7n v\u00e0o m\u00f9a m\u01b0a. N\u1ea5m b\u1ec7nh l\u00e2y lan v\u00e0 x\u00e2m nhi\u1ec5m v\u00e0o c\u00e2y th\u00f4ng qua gi\u00f3 v\u00e0 n\u01b0\u1edbc. Q\u00faa tr\u00ecnh h\u00ecnh th\u00e0nh v\u00e0 n\u1ea3y m\u1ea7m c\u1ee7a b\u00e0o t\u1eed trong \u0111i\u1ec1u ki\u1ec7n \u1ea9m \u01b0\u1edbt.<\/p>\n

3.2.<\/b> \u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1eadt \u0111\u1ed9 tr\u1ed3ng \u0111\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i c\u1ee7a hai d\u00f2ng keo lai<\/b><\/p>\n

K\u1ebft qu\u1ea3 \u0111i\u1ec1u tra l\u1ea7n cu\u1ed1i c\u00f9ng v\u00e0o th\u00e1ng 12 n\u0103m 2003, \u0111\u01b0\u1ee3c ch\u1ec9 ra trong b\u1ea3ng 1.<\/p>\n

B\u1ea3ng 1. \u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1eadt \u0111\u1ed9 tr\u1ed3ng \u0111\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i<\/i><\/p>\n

c\u1ee7a hai d\u00f2ng keo lai PV03 v\u00e0 TB06<\/i><\/p>\n\n\n\n\n\n\n\n\n
D\u00f2ng<\/b><\/p>\n

Keo lai<\/b><\/td>\n

M\u1eadt \u0111\u1ed9,<\/b><\/p>\n

c\u00e2y\/ha<\/b><\/td>\n

T\u1ef7 l\u1ec7 b\u1ecb b\u1ec7nh <\/b><\/p>\n

T (%)<\/b><\/td>\n

T\u1ef7 l\u1ec7 b\u1ecb b\u1ec7nh<\/b><\/p>\n

trung b\u00ecnh <\/b><\/p>\n

T (%)<\/b><\/td>\n

\n

C\u00e1c ch\u1ec9 s\u1ed1 th\u1ed1ng k\u00ea<\/h3>\n<\/td>\n

<\/td>\n<\/tr>\n
L\u1eb7p 1<\/b><\/td>\nL\u1eb7p 2<\/b><\/td>\nL\u1eb7p 3<\/b><\/td>\nS<\/b><\/td>\nS,%<\/b><\/td>\nFt\u00ednh<\/i><\/b><\/b><\/td>\nP-value<\/i><\/b><\/b><\/td>\nF b\u1ea3ng<\/i><\/b><\/b><\/td>\n<\/tr>\n
PV03<\/td>\n1111<\/td>\n21<\/td>\n31<\/td>\n20<\/td>\n24.00<\/td>\n6.0828<\/td>\n25.34<\/td>\n3.094059<\/td>\n0.153397<\/td>\n7.70865<\/td>\n<\/tr>\n
1428<\/td>\n27<\/td>\n32<\/td>\n38<\/td>\n32.33<\/td>\n5.5076<\/td>\n17.03<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
TB06<\/td>\n1111<\/td>\n13<\/td>\n14<\/td>\n15<\/td>\n14.00<\/td>\n1.0000<\/td>\n7.14<\/td>\n13.72857<\/td>\n0.020741<\/td>\n7.70865<\/td>\n<\/tr>\n
1428<\/td>\n19<\/td>\n26<\/td>\n28<\/td>\n24.33<\/td>\n4.7258<\/td>\n19.42<\/td>\n<\/td>\n<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Nh\u1eadn x\u00e9t :<\/i><\/p>\n

* Qua k\u1ebft qu\u1ea3 \u0111i\u1ec1u tra \u1edf hi\u1ec7n tr\u01b0\u1eddng cho th\u1ea5y:<\/p>\n

– D\u00f2ng PVO3<\/p>\n

+ M\u1eadt \u0111\u1ed9 tr\u1ed3ng: 1111c\u00e2y\/ha c\u00f3 t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i dao \u0111\u1ed9ng t\u1eeb 20 – 31%.<\/p>\n

+ M\u1eadt \u0111\u1ed9 tr\u1ed3ng 1428 c\u00e2y\/ha c\u00f3 t\u1ef7 l\u1ec7 b\u1ec7nh dao \u0111\u1ed9ng t\u1eeb 27 \u2013 38%.<\/p>\n

– D\u00f2ng TBO6<\/p>\n

+ M\u1eadt \u0111\u1ed9 tr\u1ed3ng 1111c\u00e2y\/ha c\u00f3 t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i dao \u0111\u1ed9ng t\u1eeb 13 – 15%.<\/p>\n

+ M\u1eadt \u0111\u1ed9 tr\u1ed3ng 1428c\u00e2y\/ha c\u00f3 t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i dao \u0111\u1ed9ng t\u1eeb 19 – 28%.<\/p>\n

Nh\u01b0 v\u1eady, c\u1ea3 hai d\u00f2ng keo lai \u0111\u1ec1u c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i gi\u1eefa c\u00e1c m\u1eadt \u0111\u1ed9 r\u1eebng tr\u1ed3ng. S\u1ef1 kh\u00e1c bi\u1ec7t c\u00f3 \u00fd ngh\u0129a v\u1ec1 th\u1ed1ng k\u00ea \u0111\u01b0\u1ee3c ghi nh\u1eadn \u1edf d\u00f2ng TB06 (Ft\u00ednh=”13.72″ >Fchu\u1ea9n =”7.70).” \u1ede m\u1eadt \u0111\u1ed9 1111c\u00e2y\/ha, t\u1ef7 l\u1ec7 nhi\u1ec5m b\u1ec7nh th\u1ea5p h\u01a1n \u1edf m\u1eadt \u0111\u1ed9 1428c\u00e2y\/ha. K\u1ebft qu\u1ea3 n\u00e0y cho th\u1ea5y n\u1ebfu tr\u1ed3ng m\u1eadt \u0111\u1ed9 c\u00e0ng d\u00e0y, nguy c\u01a1 b\u1ecb b\u1ec7nh c\u00e0ng cao.<\/p>\n

* X\u00e9t v\u1ec1 kh\u1ea3 n\u0103ng kh\u00e1ng b\u1ec7nh c\u1ee7a c\u00e1c d\u00f2ng keo lai cho th\u1ea5y: \u1ede c\u1ea3 hai m\u1eadt \u0111\u1ed9 tr\u1ed3ng kh\u00e1c nhau, d\u00f2ng PV03 \u0111\u1ec1u c\u00f3 t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i l\u1edbn h\u01a1n d\u00f2ng TB06. \u1ede m\u1eadt \u0111\u1ed9 1111 c\u00e2y\/ha, t\u1ef7 l\u1ec7 b\u1ec7nh b\u00ecnh qu\u00e2n c\u1ee7a d\u00f2ng PVO3 l\u00e0 24% v\u00e0 d\u00f2ng TBO6 l\u00e014%. \u1ede m\u1eadt \u0111\u1ed9 1428 c\u00e2y\/ha, t\u1ef7 l\u1ec7 b\u1ec7nh b\u00ecnh qu\u00e2n c\u1ee7a d\u00f2ng PVO3 l\u00e0 32.33% v\u00e0 d\u00f2ng TBO6 24.33%.<\/p>\n

Bi\u1ec3u \u0111\u1ed3 1. \u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1eadt \u0111\u1ed9 \u0111\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i c\u1ee7a hai d\u00f2ng keo lai<\/i><\/p>\n\n\n\n
T\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i tr\u00ean c\u00e2y keo lai \u0111i\u1ec1u tra t\u1ea1i T\u00e2n L\u1eadp, B\u00ecnh Ph\u01b0\u1edbc 2003<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/p>\n

3.3.<\/b> Di\u1ec5n bi\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i (%) tr\u00ean c\u00e2y keo lai qua c\u00e1c k\u1ef3 \u0111i\u1ec1u tra<\/b><\/p>\n

B\u1ec7nh h\u1ea1i keo lai ch\u1ee7 y\u1ebfu xu\u1ea5t hi\u1ec7n trong m\u00f9a m\u01b0a, khi \u0111\u1ed9 \u1ea9m trong r\u1eebng cao v\u00e0 r\u1eebng \u0111\u00e3 kh\u00e9p t\u00e1n. Tuy nhi\u00ean, c\u1ea7n xem x\u00e9t di\u1ec5n bi\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i trong su\u1ed1t m\u00f9a m\u01b0a kho\u1ea3ng 5-6 th\u00e1ng l\u00e0m c\u01a1 s\u1edf \u0111\u1ec1 xu\u1ea5t th\u1eddi \u0111i\u1ec3m t\u00e1c \u0111\u1ed9ng l\u00e0m gi\u1ea3m thi\u1ec3u \u1ea3nh h\u01b0\u1edfng c\u1ee7a b\u1ec7nh h\u1ea1i. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u01b0\u1ee3c ghi nh\u1eadn trong bi\u1ec3u 2.<\/p>\n

Bi\u1ec3u 2. Di\u1ec5n bi\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i (%) trong m\u00f9a m\u01b0a<\/i><\/p>\n\n\n\n\n\n\n\n\n\n
K\u1ef3 \u0111i\u1ec1u tra<\/b><\/td>\n\n

L\u1ea7n 1 \u2013 th\u00e1ng 7<\/h2>\n<\/td>\n

L\u1ea7n 2- th\u00e1ng 9<\/b><\/td>\nL\u1ea7n 3- th\u00e1ng 12<\/b><\/td>\n<\/tr>\n
\n

D\u00f2ng TB06<\/h2>\n<\/td>\n

<\/td>\n<\/tr>\n
M\u1eadt \u0111\u1ed9 1111 c\/ha<\/td>\n32<\/td>\n36<\/td>\n36<\/td>\n<\/tr>\n
M\u1eadt \u0111\u1ed9 1428 c\/ha<\/td>\n21<\/td>\n33<\/td>\n36<\/td>\n<\/tr>\n
\n

D\u00f2ng PV03<\/h2>\n<\/td>\n

<\/td>\n<\/tr>\n
M\u1eadt \u0111\u1ed9 1111 c\/ha<\/td>\n27<\/td>\n37<\/td>\n37<\/td>\n<\/tr>\n
M\u1eadt \u0111\u1ed9 1428 c\/ha<\/td>\n14<\/td>\n21<\/td>\n24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Nh\u1eadn x\u00e9t: <\/i><\/p>\n

T\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i \u0111\u1ec1u gia t\u0103ng trong su\u1ed1t m\u00f9a m\u01b0a tr\u00ean c\u1ea3 hai y\u1ebfu t\u1ed1 m\u1eadt \u0111\u1ed9 tr\u1ed3ng v\u00e0 d\u00f2ng keo lai. Nh\u01b0 v\u1eady b\u1ec7nh ph\u1ea5n h\u1ed3ng ph\u00e1t tri\u1ec3n v\u00e0 l\u00e2y lan nhanh trong \u0111i\u1ec1u ki\u1ec7n \u1ea9m \u0111\u1ed9 cao. V\u1ec1 m\u00f9a kh\u00f4 \u1ea9m \u0111\u1ed9 th\u1ea5p b\u1ec7nh kh\u00f4ng ph\u00e1t tri\u1ec3n v\u00e0 l\u00e2y lan.<\/p>\n

3.4.<\/b> \u1ea2nh h\u01b0\u1edfng c\u1ee7a m\u1ed9t s\u1ed1 lo\u1ea1i thu\u1ed1c tr\u1eeb b\u1ec7nh<\/b><\/p>\n

Vi\u1ec7c s\u1eed d\u1ee5ng thu\u1ed1c ho\u00e1 h\u1ecdc l\u00e0m gi\u1ea3m thi\u1ec3u t\u00e1c h\u1ea1i c\u1ee7a b\u1ec7nh \u0111\u00e3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ea5t ph\u1ed5 bi\u1ebfn trong tr\u1ed3ng c\u00e2y \u0103n qu\u1ea3, \u0111i\u1ec1u, ti\u00eau v\u00e0 c\u00e2y cao su \u1edf c\u00e1c t\u1ec9nh mi\u1ec1n \u0110\u00f4ng Nam B\u1ed9. \u0110\u1ed1i v\u1edbi c\u00e2y l\u00e2m nghi\u1ec7p, trong \u0111i\u1ec1u ki\u1ec7n th\u00e2m canh t\u0103ng n\u0103ng su\u1ea5t, b\u00ean c\u1ea1nh vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c d\u00f2ng kh\u00e1ng b\u1ec7nh, gi\u1ea3i ph\u00e1p s\u1eed d\u1ee5ng thu\u1ed1c ho\u00e1 h\u1ecdc l\u00e0m gi\u1ea3m thi\u1ec3u b\u1ec7nh h\u1ea1i l\u00e0 h\u01b0\u1edbng c\u1ea7n \u0111\u01b0\u1ee3c quan t\u00e2m. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u s\u1eed d\u1ee5ng thu\u1ed1c tr\u1eeb b\u1ec7nh \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y trong bi\u1ec3u 3.<\/p>\n

Bi\u1ec3u 3. \u1ea2nh h\u01b0\u1edfng c\u1ee7a s\u1eed d\u1ee5ng thu\u1ed1c \u0111\u1ebfn t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i (%) c\u1ee7a hai d\u00f2ng keo lai <\/i><\/p>\n

tr\u1ed3ng \u1edf c\u00e1c m\u1eadt \u0111\u1ed9 kh\u00e1c nhau.<\/i><\/p>\n\n\n\n\n\n\n\n\n\n\n\n
\n

D\u00f2ng keo lai<\/h3>\n<\/td>\n

Tr\u01b0\u1edbc khi<\/b><\/p>\n

x\u1eed l\u00fd<\/b><\/p>\n

thu\u1ed1c<\/b><\/p>\n

(%)<\/b><\/td>\n

\n

Thu\u1ed1c Bordeaux 1%<\/h3>\n<\/td>\n

Thu\u1ed1c Dethamin M-45<\/b><\/p>\n

1 %<\/b><\/td>\n<\/tr>\n

Sau khi x\u1eed l\u00fd ( ng\u00e0y)<\/b><\/td>\nSau khi x\u1eed l\u00fd ( ng\u00e0y )<\/b><\/td>\n<\/tr>\n
15<\/b><\/td>\n30<\/b><\/td>\n60<\/b><\/td>\n15<\/b><\/td>\n30<\/b><\/td>\n60<\/b><\/td>\n<\/tr>\n
PVO3<\/b><\/td>\n<\/td>\n<\/tr>\n
– M\u1eadt \u0111\u1ed9 1428 c\/ha<\/td>\n32<\/td>\n28<\/td>\n30<\/td>\n30<\/td>\n38<\/td>\n38<\/td>\n40<\/td>\n<\/tr>\n
– M\u1eadt \u0111\u1ed9 1111 c\/ha<\/td>\n21<\/td>\n16<\/td>\n16<\/td>\n16<\/td>\n20<\/td>\n20<\/td>\n23<\/td>\n<\/tr>\n
TBO6<\/b><\/td>\n<\/td>\n<\/tr>\n
– M\u1eadt \u0111\u1ed9 1428 c\/ha<\/td>\n27<\/td>\n19<\/td>\n21<\/td>\n21<\/td>\n29<\/td>\n29<\/td>\n31<\/td>\n<\/tr>\n
– M\u1eadt \u0111\u1ed9 1111 c\/ha<\/td>\n14<\/td>\n13<\/td>\n13<\/td>\n13<\/td>\n18<\/td>\n20<\/td>\n20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Nh\u1eadn x\u00e9t<\/u><\/i><\/p>\n

* K\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m x\u1eed l\u00fd thu\u1ed1c h\u00f3a h\u1ecdc \u1edf bi\u1ec3u 3 cho th\u1ea5y \u0111\u1ed1i v\u1edbi thu\u1ed1c Bordeaus 1%, c\u00f3 l\u00e0m gi\u1ea3m t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i \u0111\u1ed1i v\u1edbi d\u00f2ng keo PVO3 \u1edf m\u1eadt \u0111\u1ed9 1428c\/ha t\u1eeb 32% xu\u1ed1ng 28% v\u00e0 m\u1eadt \u0111\u1ed9 1111c\/ha gi\u1ea3m t\u1eeb 21% xu\u1ed1ng 16% sau 15 ng\u00e0y phun thu\u1ed1c. T\u01b0\u01a1ng t\u1ef1, v\u1edbi d\u00f2ng keo TBO6 \u1edf m\u1eadt \u0111\u1ed9 1428 c\/ha gi\u1ea3m t\u1eeb 27% xu\u1ed1ng 19% v\u00e0 \u1edf m\u1eadt \u0111\u1ed9 1111c\/ha, gi\u1ea3m t\u1eeb 14% xu\u1ed1ng 13%. Nh\u01b0 v\u1eady, vi\u1ec7c s\u1eed d\u1ee5ng thu\u1ed1c h\u00f3a h\u1ecdc c\u0169ng l\u00e0m gi\u1ea3m t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i nh\u01b0ng \u1ea3nh h\u01b0\u1edfng kh\u00f4ng l\u1edbn.<\/p>\n

* Hi\u1ec7u qu\u1ea3 c\u1ee7a thu\u1ed1c gi\u1ea3m d\u1ea7n theo th\u1eddi gian, nh\u01b0 \u1edf m\u1eadt \u0111\u1ed9 tr\u1ed3ng 1428c\/ha. Hi\u1ec7u qu\u1ea3 c\u1ee7a thu\u1ed1c ch\u1ec9 k\u00e9o d\u00e0i trong kho\u1ea3ng th\u1eddi gian 15 ng\u00e0y.<\/p>\n

* \u0110\u1ed1i v\u1edbi thu\u1ed1c Dethamin M-45, h\u1ea7u nh\u01b0 kh\u00f4ng t\u00e1c \u0111\u1ed9ng l\u00e0m gi\u1ea3m t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i tr\u00ean c\u1ea3 hai d\u00f2ng keo lai \u1edf c\u00e1c m\u1eadt \u0111\u1ed9 r\u1eebng tr\u1ed3ng kh\u00e1c nhau.<\/p>\n

4. K\u1ebeT LU\u1eacN V\u00c0 KHUY\u1ebeN NGH\u1eca<\/b><\/p>\n

4.1. K\u1ebft lu\u1eadn <\/b><\/p>\n

    \n
  1. M\u1eadt \u0111\u1ed9 r\u1eebng tr\u1ed3ng keo lai 1111 c\u00e2y\/ha c\u00f3 t\u1ef7 l\u1ec7 thi\u1ec7t h\u1ea1i do b\u1ec7nh ph\u1ea5n h\u1ed3ng g\u00e2y ra th\u1ea5p h\u01a1n trung b\u00ecnh 8% so v\u1edbi m\u1eadt \u0111\u1ed9 tr\u1ed3ng 1428 c\u00e2y \/ha.<\/li>\n
  2. D\u00f2ng keo lai TBO6 c\u00f3 kh\u1ea3 n\u0103ng kh\u00e1ng b\u1ec7nh cao h\u01a1n so v\u1edbi d\u00f2ng PVO3.<\/li>\n
  3. B\u1ec7nh ph\u1ea5n h\u1ed3ng l\u00e2y lan m\u1ea1nh su\u1ed1t trong th\u1eddi gian m\u00f9a m\u01b0a -t\u1eeb th\u00e1ng 7-12 trong n\u0103m.<\/li>\n
  4. Trong hai lo\u1ea1i thu\u1ed1c kh\u1ea3o nghi\u1ec7m, thu\u1ed1c Bordeaux 1% c\u00f3 hi\u1ec7u q\u1ee7a l\u00e0m gi\u1ea3m t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i, trong khi thu\u1ed1c Dethamin M-45 h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 t\u00e1c d\u1ee5ng.<\/li>\n<\/ol>\n

    4.2. Khuy\u1ebfn ngh\u1ecb<\/b><\/p>\n

    1. C\u1ea7n ti\u1ebfp t\u1ee5c kh\u1ea3o s\u00e1t kh\u1ea3 n\u0103ng kh\u00e1ng b\u1ec7nh ph\u1ea5n h\u1ed3ng c\u1ee7a c\u00e1c d\u00f2ng keo lai.<\/p>\n

      \n
    1. Nghi\u00ean c\u1ee9u t\u1ec9a th\u01b0a v\u00e0 v\u1ec7 sinh r\u1eebng tr\u1ed3ng nh\u1eb1m gi\u1ea3m thi\u1ec3u t\u1ef7 l\u1ec7 b\u1ec7nh h\u1ea1i.<\/li>\n<\/ol>\n

      T\u00e0i li\u1ec7u tham kh\u1ea3o.<\/b><\/p>\n

      – Kenneth M.Old, Lee Su See, Jyoti K.Sharma, Zi Qing Yuan, 2000. A manual of diseases of Tropical Acacia in Australia, South \u2013 East Asiaand India. CIFOR, CSIRO, ACIAR.<\/p>\n

      Application of silvicultural techniques to reduce damage caused by pink disease to acacia hybrid<\/i> plantation<\/b><\/p>\n

      Summary<\/b><\/p>\n

      Acacia hybrid<\/i>usually suffers from pink disease in rainy season. Study on acacia hybrid<\/i> plantation in Tan Lap, Binh Phuoc shows that the ratio of diseased trees in plantation of planting density 1111 trees\/ha is smaller than that in plantation of planting density 1428 trees\/ha. The disease lasts through out the raining season from July to December, ill-effecting the tree growth and sometimes breaks the trees in severe cases. Bordeaux1% can reduce the ratio of diseased trees but the effect of this fungicide does weaken with time. The use of Dethamin M-45 has not been found effective. Of the two acacia hybrid<\/i> clones tried,<\/b>TB06 is more resistant to the disease than PV03.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Trong nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y n\u0103ng su\u1ea5t r\u1eebng tr\u1ed3ng keo lai (gi\u1ed1ng lai t\u1ef1 nhi\u00ean) gi\u1eefa keo tai t\u01b0\u1ee3ng (Acacia mangium) v\u00e0 keo l\u00e1 tr\u00e0m (Acacia auriculiformis) c\u00f3 r\u1ea5t nhi\u1ec1u tri\u1ec3n v\u1ecdng v\u00e0 \u0111ang kh\u1eb3ng \u0111\u1ecbnh \u0111\u01b0\u1ee3c vai tr\u00f2 c\u1ee7a lo\u00e0i c\u00e2y n\u00e0y trong c\u01a1 c\u1ea5u c\u00e2y tr\u1ed3ng ch\u00ednh l\u00e0m nguy\u00ean li\u1ec7u gi\u1ea5y.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/490"}],"collection":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=490"}],"version-history":[{"count":4,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/490\/revisions"}],"predecessor-version":[{"id":19106,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/490\/revisions\/19106"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=490"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=490"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=490"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}