<\/p>\n
<\/p>\n
TS. Ph\u1ea1m Quang Thu<\/p>\n
Vi\u1ec7n Khoa h\u1ecdc l\u00e2m nghi\u1ec7p Vi\u1ec7t Nam<\/p>\n
<\/p>\n
1. M\u1edf \u0111\u1ea7u:<\/b><\/p>\n
Re g\u1eebng (Cinnamomum obtusifolium<\/i> A. Chev.) l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 l\u1edbn, chi\u1ec1u cao c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi 30 m\u00e9t, \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c \u0111\u1ea1t t\u1edbi h\u00e0ng m\u00e9t khi m\u1ecdc trong r\u1eebng k\u00edn, \u1ea9m, th\u01b0\u1eddng xanh. Re g\u1eebng ph\u00e2n b\u1ed1 r\u1ed9ng tr\u00ean nhi\u1ec1u v\u00f9ng sinh th\u00e1i, nh\u01b0ng ph\u00e2n b\u1ed1 ph\u1ed5 bi\u1ebfn \u1edf \u0111\u1ed9 cao t\u1eeb 200 m\u00e9t tr\u1edf l\u00ean v\u1edbi kh\u00ed h\u1eadu nhi\u1ec7t \u0111\u1edbi \u1ea9m m\u01b0a m\u00f9a, c\u00f3 l\u01b0\u1ee3ng m\u01b0a b\u00ecnh qu\u00e2n t\u1eeb 800 \u0111\u1ebfn 2500 mm\/n\u0103m, nhi\u1ec7t \u0111\u1ed9 b\u00ecnh qu\u00e2n n\u0103m 20-220<\/sup>C. Hi\u1ec7n nay, c\u00e2y re g\u1eebng \u0111ang \u0111\u01b0\u1ee3c g\u00e2y tr\u1ed3ng \u0111\u1ec3 l\u1ea5y g\u1ed7 trong c\u00e1c v\u01b0\u1eddn r\u1eebng \u1edf nhi\u1ec1u \u0111\u1ecba ph\u01b0\u01a1ng trong c\u1ea3 n\u01b0\u1edbc ho\u1eb7c tr\u1ed3ng r\u1eebng ph\u00f2ng h\u1ed9. Lo\u00e0i c\u00e2y n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c tr\u1ed3ng trong c\u00e1c m\u00f4 h\u00ecnh l\u00e0m gi\u00e0u r\u1eebng theo \u0111\u00e1m, theo r\u1ea1ch nh\u01b0 c\u00e1c m\u00f4 h\u00ecnh \u1edf Kon H\u00e0 N\u1eebng (Gia Lai) v\u00e0 C\u1ea7u Hai (Ph\u00fa Th\u1ecd). Re g\u1eebng c\u0169ng c\u00f3 th\u1ec3 tr\u1ed3ng \u0111\u01b0\u1ee3c tr\u00ean \u0111\u1ea5t sau n\u01b0\u01a1ng r\u1eaby h\u1ecd\u0103c lu\u00e2n k\u1ef3 hai sau khai th\u00e1c r\u1eebng tr\u1ed3ng c\u00e1c lo\u00e0i keo, m\u1ee1, b\u1ea1ch \u0111\u00e0n v\u00e0 b\u1ed3 \u0111\u1ec1. Khi c\u00e2y c\u00f2n nh\u1ecf, ch\u1ecbu b\u00f3ng nh\u1eb9, t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i nhanh, b\u00ecnh qu\u00e2n \u0111\u1ea1t 1cm\/n\u0103m v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 0,8-1,0 m\/n\u0103m v\u1ec1 chi\u1ec1u cao (Nguy\u1ec5n B\u00e1 Ch\u1ea5t, 2002). Hi\u1ec7n nay, re g\u1eebng l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i c\u00e2y \u0111\u01b0\u1ee3c ch\u1ecdn \u0111\u1ec3 tr\u1ed3ng \u1edf nhi\u1ec1u \u0111\u1ecba ph\u01b0\u01a1ng.<\/p>\n Qua vi\u1ec7c \u0111i\u1ec1u tra b\u1ec7nh h\u1ea1i c\u1ee7a c\u00e2y re g\u1eebng tr\u00ean c\u00e1c m\u00f4 h\u00ecnh r\u1eebng tr\u1ed3ng v\u00e0 \u1edf v\u01b0\u1eddn \u01b0\u01a1m, b\u01b0\u1edbc \u0111\u1ea7u \u0111\u00e3 ph\u00e1t hi\u1ec7n \u0111\u01b0\u1ee3c b\u1ec7nh kh\u00f4 \u0111\u1ea7u l\u00e1 do n\u1ea5m g\u00e2y h\u1ea1i. T\u1ef7 l\u1ec7 b\u1ecb b\u1ec7nh \u1edf r\u1eebng tr\u1ed3ng t\u01b0\u01a1ng \u0111\u1ed1i cao, h\u1ea7u nh\u01b0 t\u1ea5t c\u1ea3 c\u00e1c c\u00e2y \u0111\u1ec1u c\u00f3 l\u00e1 b\u1ecb b\u1ec7nh nh\u01b0ng x\u00e9t v\u1ec1 m\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh th\u00ec c\u00f2n r\u1ea5t nh\u1eb9, l\u00e1 b\u1ecb nhi\u1ec5m b\u1ec7nh ch\u1ee7 y\u1ebfu l\u00e0 c\u00e1c l\u00e1 \u1edf t\u1ea7ng d\u01b0\u1edbi c\u1ee7a t\u00e1n c\u00e2y.<\/p>\n Qua nghi\u00ean c\u1ee9u tri\u1ec7u ch\u1ee9ng v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a qu\u00e1 tr\u00ecnh ph\u00e1t sinh ph\u00e1t tri\u1ec3n c\u1ee7a b\u1ec7nh, b\u1ec7nh kh\u00f4 \u0111\u1ea7u l\u00e1 c\u00e2y re g\u1eebng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh do m\u1ed9t lo\u00e0i n\u1ea5m thu\u1ed9c chi n\u1ea5m Colletotrichum<\/i> g\u00e2y n\u00ean. Chi n\u1ea5m n\u00e0y theo Brian C. Sutton, 1980 c\u00f3 22 lo\u00e0i g\u00e2y h\u1ea1i cho nhi\u1ec1u lo\u00e0i th\u1ef1c v\u1eadt v\u00e0 m\u1ed7i m\u1ed9t lo\u00e0i c\u00f3 ph\u1ea1m vi c\u00e2y ch\u1ee7 r\u1ea5t r\u1ed9ng. \u0110\u1ec3 c\u00f3 c\u01a1 s\u1edf qu\u1ea3n l\u00fd b\u1ec7nh d\u1ecbch c\u00f3 hi\u1ec7u qu\u1ea3 c\u1ea7n x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c lo\u00e0i n\u1ea5m g\u00e2y b\u1ec7nh, qu\u00e1 tr\u00ecnh x\u00e2m nhi\u1ec5m tr\u00ean c\u01a1 s\u1edf \u0111\u00f3 x\u00e2y d\u1ef1ng c\u00e1c bi\u1ec7n ph\u00e1p ph\u00f2ng tr\u1eeb g\u00f3p ph\u1ea7n b\u1ea3o v\u1ec7, ph\u00e1t tri\u1ec3n v\u00e0 g\u00e2y tr\u1ed3ng th\u00e0nh c\u00f4ng lo\u00e0i c\u00e2y g\u1ed7 b\u1ea3n \u0111\u1ecba c\u00f3 gi\u00e1 tr\u1ecb n\u00e0y.<\/p>\n <\/p>\n <\/p>\n <\/p>\n 2. N\u1ed9i dung v\u00e0 ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u <\/b><\/p>\n N\u1ed9i dung:<\/i><\/p>\n -Nghi\u00ean c\u1ee9u gi\u00e1m \u0111\u1ecbnh lo\u00e0i n\u1ea5m g\u00e2y b\u1ec7nh<\/p>\n -\u0110i\u1ec1u tra x\u00e1c \u0111\u1ecbnh t\u1ef7 l\u1ec7 v\u00e0 m\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh, b\u1ec7nh d\u1ecbch h\u1ecdc<\/p>\n -Nghi\u00ean c\u1ee9u n\u1ea3y m\u1ea7m c\u1ee7a b\u00e0o t\u1eed v\u00f4 t\u00ednh v\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m (appressorium)<\/p>\n -\u0110\u1ec1 xu\u1ea5t c\u00e1c bi\u1ec7n ph\u00e1p qu\u1ea3n l\u00fd d\u1ecbch h\u1ea1i<\/p>\n Ph\u01b0\u01a1ng ph\u00e1p nghi\u00ean c\u1ee9u<\/i><\/p>\n Nghi\u00ean c\u1ee9u gi\u00e1m \u0111\u1ecbnh lo\u00e0i n\u1ea5m g\u00e2y b\u1ec7nh tr\u00ean c\u01a1 s\u1edf h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc b\u00e0o t\u1eed v\u00f4 t\u00ednh, h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1edbc c\u1ee7a th\u1ec3 b\u00e1m, \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a khu\u1ea9n l\u1ea1c tr\u00ean m\u00f4i tr\u01b0\u1eddng dinh d\u01b0\u1ee1ng. C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u01a1 b\u1ea3n tr\u00ean \u0111\u1ed1i chi\u1ebfu v\u1edbi kho\u00e1 ph\u00e2n lo\u1ea1i v\u1ec1 c\u00e1c lo\u00e0i n\u1ea5m thu\u1ed9c chi Colletotrichum<\/i> c\u1ee7a Brian C. Sutton, 1980. T\u1ef7 l\u1ec7 c\u00e2y b\u1ecb b\u1ec7nh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng t\u1ef7 s\u1ed1 gi\u1eefa c\u00e2y b\u1ecb b\u1ec7nh tr\u00ean t\u1ed5ng s\u1ed1 c\u00e2y \u0111i\u1ec1u tra. M\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p l\u1ea5y m\u1eabu \u0111i\u1ec3n h\u00ecnh. Tr\u00ean c\u00e2y ti\u00eau chu\u1ea9n ch\u1ecdn c\u00e0nh l\u00e1 \u0111i\u1ec3n h\u00ecnh \u0111\u1ebfm s\u1ed1 l\u00e1 b\u1ecb b\u1ec7nh, m\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh l\u00e0 t\u1ef7 s\u1ed1 gi\u1eefa s\u1ed1 l\u00e1 b\u1ecb b\u1ec7nh v\u1edbi t\u1ed5ng s\u1ed1 l\u00e1 \u0111i\u1ec1u tra. Nghi\u00ean c\u1ee9u b\u00e0o t\u1eed n\u1ea3y m\u1ea7m v\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p nh\u1ecf gi\u1ecdt n\u01b0\u1edbc ch\u1ee9a b\u00e0o t\u1eed v\u00f4 t\u00ednh tr\u00ean lam k\u00ednh, \u0111\u1eb7t lam k\u00ednh trong h\u1ed9p l\u1ed3ng \u1ea9m, sau 24 gi\u1edd t\u00ednh t\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m v\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m c\u1ee7a s\u1ee3i n\u1ea5m tr\u00ean k\u00ednh hi\u1ec3n vi.<\/p>\n <\/p>\n <\/p>\n 3. K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u v\u00e0 th\u1ea3o lu\u1eadn<\/b><\/p>\n K\u1ebft qu\u1ea3 gi\u00e1m \u0111\u1ecbnh<\/i><\/b><\/p>\n M\u00f4 t\u1ea3 m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a n\u1ea5m nh\u01b0 sau:<\/p>\n – \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a b\u00e0o t\u1eed v\u00f4 t\u00ednh: b\u00e0o t\u1eed c\u00f3 d\u1ea1ng th\u1eb3ng, h\u00ecnh tr\u1ee5, k\u00edch th\u01b0\u1edbc d\u00e0i t\u1eeb 12,5 \u0111\u1ebfn 19,0 mm, chi\u1ec1u r\u1ed9ng trung b\u00ecnh kho\u1ea3ng 4,0 mm.<\/p>\n – \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a th\u1ec3 b\u00e1m: khi b\u00e0o t\u1eed n\u1ea3y m\u1ea7m, s\u1ee3i n\u1ea5m h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m. Th\u1ec3 b\u00e1m c\u00f3 m\u00e0u n\u00e2u nh\u1ea1t, h\u00ecnh tr\u00f2n ho\u1eb7c g\u1ea7n tr\u00f2n. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m c\u01a1 b\u1ea3n \u0111\u1ec3 gi\u00e1m \u0111\u1ecbnh c\u00e1c lo\u00e0i thu\u1ed9c chi Colletotrichum<\/i>. K\u00edch th\u01b0\u1edbc trung b\u00ecnh 8,0-9,5 mm X 5,5-6,5 mm.<\/p>\n – \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a khu\u1ea9n l\u1ea1c: khu\u1ea9n l\u1ea1c khi gi\u00e0 c\u00f3 m\u00e0u x\u00e1m, kh\u00f4ng c\u00f3 h\u1ea1ch n\u1ea5m.<\/p>\n Tr\u00ean c\u01a1 s\u1edf nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m tr\u00ean \u0111\u1ed1i chi\u1ebfu v\u1edbi kho\u00e1 ph\u00e2n lo\u1ea1i c\u1ee7a Brian C. Sutton, 1980, lo\u00e0i n\u1ea5m g\u00e2y b\u1ec7nh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh nh\u01b0 sau:<\/p>\n -Lo\u00e0i n\u1ea5m: Colletotrichum coffeanum<\/i> Noack<\/p>\n -Chi n\u1ea5m than: Colletotrichum <\/i>Corda<\/p>\n -H\u1ecd n\u1ea5m \u0111\u0129a b\u00e0o t\u1eed: Melanconiaceae<\/p>\n -B\u1ed9 n\u1ea5m \u0111\u0129a b\u00e0o t\u1eed: Melanconiales<\/p>\n -L\u1edbp n\u1ea5m b\u00e0o t\u1eed xoang: Coelomycetes<\/p>\n -Ng\u00e0nh ph\u1ee5 n\u1ea5m b\u1ea5t to\u00e0n: Deuteromycotina<\/p>\n Tri\u1ec7u ch\u1ee9ng v\u00e0 qu\u00e1 tr\u00ecnh x\u00e2m nhi\u1ec5m<\/i><\/b><\/p>\n \u0110\u1ed1i v\u1edbi c\u00e1c lo\u00e0i n\u1ea5m thu\u1ed9c chi Colletotrichum<\/i> th\u01b0\u1eddng g\u00e2y ra r\u1ea5t nhi\u1ec1u d\u1ea1ng tri\u1ec7u ch\u1ee9ng kh\u00e1c nhau cho c\u00e2y ch\u1ee7 bao g\u1ed3m kh\u00f4 ch\u1ed3i non, \u0111\u1ed1m l\u00e1 v\u00e0 kh\u00f4 \u0111\u1ea7u l\u00e1… \u0110\u1ed1i v\u1edbi c\u00e2y re g\u1eebng tri\u1ec7u ch\u1ee9ng \u0111i\u1ec3n h\u00ecnh l\u00e0 kh\u00f4 \u0111\u1ea7u l\u00e1. B\u1ec7nh th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n \u1edf c\u00e1c l\u00e1 gi\u00e0 v\u00e0 t\u1ea7ng d\u01b0\u1edbi c\u1ee7a t\u00e1n l\u00e1. Khi n\u1ea5m m\u1edbi x\u00e2m nhi\u1ec5m tr\u00ean \u0111\u1ea7u l\u00e1 th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n c\u00e1c \u0111\u1ed1m nh\u1ecf m\u00e0u n\u00e2u h\u01a1i \u0111\u1ecf h\u00ecnh tr\u00f2n ho\u1eb7c h\u00ecnh \u00f4 val. C\u00e1c \u0111\u1ed1m b\u1ec7nh n\u00e0y ph\u00e1t tri\u1ec3n nhanh l\u00e0m cho \u0111\u1ea7u v\u00e0 c\u00e1c m\u00e9p l\u00e1 b\u1ecb kh\u00f4, tr\u01b0\u1eddng h\u1ee3p n\u1eb7ng to\u00e0n b\u1ed9 phi\u1ebfn l\u00e1 b\u1ecb kh\u00f4 v\u00e0 r\u1ee5ng. M\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh \u0111\u1ed1i v\u1edbi c\u00e2y \u1edf r\u1eebng tr\u1ed3ng c\u00f2n nh\u1eb9, trung b\u00ecnh 5-10% s\u1ed1 l\u00e1 b\u1ecb nhi\u1ec5m b\u1ec7nh. \u0110\u1eb7c \u0111i\u1ec3m sinh h\u1ecdc c\u1ee7a c\u00e1c lo\u00e0i n\u1ea5m n\u00e0y l\u00e0 khi b\u00e0o t\u1eed v\u00f4 t\u00ednh n\u1ea3y m\u1ea7m, ch\u00fang h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m b\u00e1m v\u00e0o b\u1ec1 m\u1eb7t c\u00e2y ch\u1ee7 sau \u0111\u00f3 s\u1ee3i n\u1ea5m m\u1edbi x\u00e2m nhi\u1ec5m v\u00e0o t\u1ebf b\u00e0o, l\u00e0m t\u1ed5 ch\u1ee9c t\u1ebf b\u00e0o b\u1ecb t\u1ed5n th\u01b0\u01a1ng v\u00e0 h\u00ecnh th\u00e0nh \u0111\u1ed1m b\u1ec7nh.<\/p>\n B\u1ec7nh d\u1ecbch h\u1ecdc v\u00e0 \u1ea3nh h\u01b0\u1edfng c\u1ee7a b\u1ec7nh<\/i><\/b><\/p>\n \u0110\u1ed1i v\u1edbi r\u1eebng tr\u1ed3ng b\u1ec7nh th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n \u1edf t\u1ea7ng d\u01b0\u1edbi c\u1ee7a t\u00e1n, b\u1ec7nh th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n khi c\u00e2y tr\u1ed3ng s\u1ed1ng trong \u0111i\u1ec1u ki\u1ec7n kh\u00f4ng thu\u1eadn l\u1ee3i c\u1ee7a th\u1eddi ti\u1ebft. Khi gieo \u01b0\u01a1m, tr\u00ean c\u00e1c lu\u1ed1ng c\u00e2y con \u0111\u1eb7t qu\u00e1 d\u00e0y, s\u1ef1 th\u00f4ng tho\u00e1ng k\u00e9m, c\u00e2y m\u1eafc b\u1ec7nh ph\u1ed5 bi\u1ebfn. \u0110\u00e2y l\u00e0 lo\u00e0i n\u1ea5m ph\u00e2n b\u1ed1 r\u1ea5t r\u1ed9ng, ch\u00fang g\u00e2y h\u1ea1i cho nhi\u1ec1u lo\u00e0i th\u1ef1c v\u1eadt \u1edf c\u00e1c n\u01b0\u1edbc nhi\u1ec7t \u0111\u1edbi. Do b\u1ec7nh ch\u1ec9 xu\u1ea5t hi\u1ec7n \u1edf ph\u1ea7n d\u01b0\u1edbi c\u1ee7a t\u00e1n l\u00e1, ch\u01b0a c\u00f3 m\u1ed9t ghi nh\u1eadn n\u00e0o lo\u00e0i n\u1ea5m n\u00e0y l\u00e0m ch\u1ebft c\u00e2y, tr\u01b0\u1eddng h\u1ee3p b\u1ec7nh n\u1eb7ng, nhi\u1ec1u l\u00e1 r\u1ee5ng c\u0169ng c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn sinh tr\u01b0\u1edfng c\u1ee7a c\u00e2y. Nh\u01b0ng khi b\u1ec7nh h\u1ea1i c\u00e2y con \u1edf v\u01b0\u1eddn \u01b0\u01a1m \u0111\u00e3 \u1ea3nh h\u01b0\u1edfng l\u1edbn \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng c\u1ee7a c\u00e2y con, c\u00e2y th\u01b0\u1eddng c\u00f2i c\u1ecdc v\u00e0 \u00edt l\u00e1.<\/p>\n T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m c\u1ee7a b\u00e0o t\u1eed v\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m<\/i><\/b><\/p>\n Sau 24 gi\u1edd, t\u1ef7 l\u1ec7 n\u1ea9y m\u1ea7m c\u1ee7a b\u00e0o t\u1eed n\u1ea5m Colletotrichum coffeanum<\/i> \u0111\u1ea1t 68,5%, trong \u0111\u00f3 c\u00f3 12,8% s\u1ed1 b\u00e0o t\u1eed c\u00f3 s\u1ee3i n\u1ea5m h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m. T\u1ef7 l\u1ec7 n\u1ea3y m\u1ea7m c\u1ee7a b\u00e0o t\u1eed t\u0103ng l\u00ean sau 48 gi\u1edd v\u00e0 \u0111\u1ea1t 88,4%, trong \u0111\u00f3 c\u00f3 65,2% s\u1ed1 b\u00e0o t\u1eed c\u00f3 s\u1ee3i n\u1ea5m h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m. Nh\u01b0 v\u1eady, n\u1ea5m Colletotrichum coffeanum<\/i> c\u1ea7n th\u1eddi gian cho b\u00e0o t\u1eed n\u1ea9y n\u1ea7m v\u00e0 h\u00ecnh th\u00e0nh th\u1ec3 b\u00e1m r\u1ea5t ng\u1eafn v\u00e0 di\u1ec5n ra v\u1edbi t\u1ed1c \u0111\u1ed9 nhanh.<\/p>\n Bi\u1ec7n ph\u00e1p qu\u1ea3n l\u00fd d\u1ecbch h\u1ea1i<\/i><\/b><\/p>\n Vi\u1ec7c ph\u00f2ng tr\u1eeb b\u1ec7nh cho r\u1eebng tr\u1ed3ng \u1edf th\u1eddi \u0111i\u1ec3m m\u1ee9c \u0111\u1ed9 b\u1ecb b\u1ec7nh c\u00f2n r\u1ea5t nh\u1eb9 th\u00ec hi\u1ec7u qu\u1ea3 kinh t\u1ebf mang l\u1ea1i ch\u01b0a r\u00f5 r\u1ec7t. V\u00ec v\u1eady, c\u1ea7n \u00e1p d\u1ee5ng bi\u1ec7n ph\u00e1p l\u00e2m sinh nh\u01b0 ch\u0103m s\u00f3c, b\u00f3n ph\u00e2n c\u00e2n \u0111\u1ed1i, t\u1ec9a c\u00e0nh \u1edf t\u1ea7ng d\u01b0\u1edbi c\u1ee7a t\u00e1n l\u00e1 khi qu\u00e1 r\u1eadm c\u1ea7n \u0111\u01b0\u1ee3c ti\u1ebfn h\u00e0nh th\u01b0\u1eddng xuy\u00ean, \u0111\u1ea3m b\u1ea3o cho c\u00e2y sinh tr\u01b0\u1edfng t\u1ed1t, h\u1ea1n ch\u1ebf \u0111\u01b0\u1ee3c s\u1ef1 x\u00e2m nhi\u1ec5m c\u1ee7a n\u1ea5m b\u1ec7nh.<\/p>\n Trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t c\u00e2y con \u1edf v\u01b0\u1eddn \u01b0\u01a1m \u0111\u1ec3 ph\u00f2ng tr\u1eeb b\u1ec7nh c\u00f3 hi\u1ec7u qu\u1ea3 c\u1ea7n ch\u1ecdn v\u01b0\u01a1n \u01b0\u01a1m \u0111\u00fang ti\u00eau chu\u1ea9n, th\u1ef1c hi\u1ec7n vi\u1ec7c v\u1ec7 sinh, ph\u00f2ng d\u1ecbch b\u1ec7nh th\u01b0\u1eddng xuy\u00ean. Kh\u00f4ng x\u1ebfp c\u00e2y qu\u00e1 d\u00e0y, t\u1ea1o \u0111i\u1ec1u ki\u1ec7n th\u00f4ng tho\u00e1ng cho lu\u1ed1ng c\u00e2y. Khi b\u1ec7nh xu\u1ea5t hi\u1ec7n c\u1ea7n thi\u1ebft ph\u1ea3i ti\u1ebfn h\u00e0nh c\u00e1c bi\u1ec7n ph\u00e1p ph\u00f2ng tr\u1eeb nh\u1eb1m t\u1ea1o c\u00e2y con c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng cao. Ho\u00e1 ch\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f3 hi\u1ec7u qu\u1ea3 \u0111\u1ed1i v\u1edbi b\u1ec7nh kh\u00f4 \u0111\u1ea7u l\u00e1 l\u00e0 chlorothalonil.<\/p>\n —————————————<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" 1. M\u1edf \u0111\u1ea7u:<\/p>\n Re g\u1eebng (Cinnamomum obtusifolium A. Chev.) l\u00e0 lo\u00e0i c\u00e2y g\u1ed7 l\u1edbn, chi\u1ec1u cao c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi 30 m\u00e9t, \u0111\u01b0\u1eddng k\u00ednh ngang ng\u1ef1c \u0111\u1ea1t t\u1edbi h\u00e0ng m\u00e9t khi m\u1ecdc trong r\u1eebng k\u00edn, \u1ea9m, th\u01b0\u1eddng xanh. Re g\u1eebng ph\u00e2n b\u1ed1 r\u1ed9ng tr\u00ean nhi\u1ec1u v\u00f9ng sinh th\u00e1i, nh\u01b0ng ph\u00e2n b\u1ed1 ph\u1ed5 bi\u1ebfn \u1edf \u0111\u1ed9 cao t\u1eeb 200 m\u00e9t tr\u1edf l\u00ean v\u1edbi kh\u00ed h\u1eadu nhi\u1ec7t \u0111\u1edbi \u1ea9m m\u01b0a m\u00f9a, c\u00f3 l\u01b0\u1ee3ng m\u01b0a b\u00ecnh qu\u00e2n t\u1eeb 800 \u0111\u1ebfn 2500 mm\/n\u0103m, nhi\u1ec7t \u0111\u1ed9 b\u00ecnh qu\u00e2n n\u0103m 20-220C. Hi\u1ec7n nay, c\u00e2y re g\u1eebng \u0111ang \u0111\u01b0\u1ee3c g\u00e2y tr\u1ed3ng \u0111\u1ec3 l\u1ea5y g\u1ed7 trong c\u00e1c v\u01b0\u1eddn r\u1eebng \u1edf nhi\u1ec1u \u0111\u1ecba ph\u01b0\u01a1ng trong c\u1ea3 n\u01b0\u1edbc ho\u1eb7c tr\u1ed3ng r\u1eebng ph\u00f2ng h\u1ed9. Lo\u00e0i c\u00e2y n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c tr\u1ed3ng trong c\u00e1c m\u00f4 h\u00ecnh l\u00e0m gi\u00e0u r\u1eebng theo \u0111\u00e1m, theo r\u1ea1ch nh\u01b0 c\u00e1c m\u00f4 h\u00ecnh \u1edf Kon H\u00e0 N\u1eebng (Gia Lai) v\u00e0 C\u1ea7u Hai (Ph\u00fa Th\u1ecd). Re g\u1eebng c\u0169ng c\u00f3 th\u1ec3 tr\u1ed3ng \u0111\u01b0\u1ee3c tr\u00ean \u0111\u1ea5t sau n\u01b0\u01a1ng r\u1eaby h\u1ecd\u0103c lu\u00e2n k\u1ef3 hai sau khai th\u00e1c r\u1eebng tr\u1ed3ng c\u00e1c lo\u00e0i keo, m\u1ee1, b\u1ea1ch \u0111\u00e0n v\u00e0 b\u1ed3 \u0111\u1ec1. Khi c\u00e2y c\u00f2n nh\u1ecf, ch\u1ecbu b\u00f3ng nh\u1eb9, t\u1ed1c \u0111\u1ed9 t\u0103ng tr\u01b0\u1edfng t\u01b0\u01a1ng \u0111\u1ed1i nhanh, b\u00ecnh qu\u00e2n \u0111\u1ea1t 1cm\/n\u0103m v\u1ec1 \u0111\u01b0\u1eddng k\u00ednh v\u00e0 0,8-1,0 m\/n\u0103m v\u1ec1 chi\u1ec1u cao (Nguy\u1ec5n B\u00e1 Ch\u1ea5t, 2002). Hi\u1ec7n nay, re g\u1eebng l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i c\u00e2y \u0111\u01b0\u1ee3c ch\u1ecdn \u0111\u1ec3 tr\u1ed3ng \u1edf nhi\u1ec1u \u0111\u1ecba ph\u01b0\u01a1ng<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[21],"tags":[],"_links":{"self":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8757"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/comments?post=8757"}],"version-history":[{"count":2,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8757\/revisions"}],"predecessor-version":[{"id":19205,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/8757\/revisions\/19205"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=8757"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=8757"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=8757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}