{"id":9617,"date":"2011-06-17T07:19:51","date_gmt":"2011-06-17T00:19:51","guid":{"rendered":"http:\/\/vafs.gov.vn\/vn\/2011\/06\/ket-qua-nghien-cuu-sau-benh-hai-thong\/"},"modified":"2013-10-06T09:02:22","modified_gmt":"2013-10-06T02:02:22","slug":"ket-qua-nghien-cuu-sau-benh-hai-thong","status":"publish","type":"post","link":"https:\/\/vafs.gov.vn\/vn\/ket-qua-nghien-cuu-sau-benh-hai-thong\/","title":{"rendered":"K\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u s\u00e2u b\u1ec7nh h\u1ea1i th\u00f4ng"},"content":{"rendered":"<\/p>\n

Ph\u1ea1m Quang Thu, \u0110\u00e0o Ng\u1ecdc Quang<\/strong> <\/p>\n

Ph\u00f2ng Nghi\u00ean c\u1ee9u B\u1ea3o v\u1ec7 Th\u1ef1c v\u1eadt r\u1eebng<\/em> <\/p>\n

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

T\u00d3M T\u1eaeT<\/strong> <\/p>\n

M\u1ed9t s\u1ed1 lo\u00e0i s\u00e2u b\u1ec7nh ch\u00ednh h\u1ea1i th\u00f4ng bao g\u1ed3m: <\/p>\n

S\u00e2u r\u00f3m th\u00f4ng (Dendrolimus punctatus<\/em>): 2-3 n\u0103m b\u00f9ng ph\u00e1t d\u1ecbch m\u1ed9t l\u1ea7n, g\u00e2y h\u1ea1i h\u00e0ng v\u1ea1n hecsta. M\u1ed7i n\u0103m c\u00f3 3-5 th\u1ebf h\u1ec7 (t\u00f9y thu\u1ed9c v\u00e0o th\u1eddi ti\u1ebft).S\u00e2u r\u00f3m b\u1ed1n t\u00fam l\u00f4ng (Dasychira axutha<\/em>): 3-4 th\u1ebf h\u1ec7 m\u1ed7i n\u0103m, g\u00e2y thi\u1ec7t h\u1ea1i nhi\u1ec1u nh\u1ea5t t\u1eeb th\u00e1ng 8 \u0111\u1ebfn th\u00e1ng 11 \u1edf r\u1eebng tr\u1ed3ng 3-10 tu\u1ed5i. <\/p>\n

S\u00e2u \u0111u\u0323c no\u0303n th\u00f4ng: Rhyacionia cristata<\/em> Wals and Dioryctria rubella<\/em> Hamps: \u1ede m\u1ed9t v\u00e0i n\u01a1i, s\u00e2u r\u00f3m th\u00f4ng \u0111\u01b0\u1ee3c coi nh\u01b0 l\u00e0 m\u1ed9t trong nh\u1eefng lo\u00e0i g\u00e2y h\u1ea1i nghi\u00eam tr\u1ecdng nh\u1ea5t \u0111\u1ed1i v\u1edbi r\u1eebng tr\u1ed3ng th\u00f4ng hai l\u00e1, g\u00e2y thi\u1ec7t h\u1ea1i h\u00e0ng tr\u0103m hecta r\u1eebng m\u1edbi tr\u1ed3ng. <\/p>\n

C\u00e1c lo\u00e0i c\u00f4n tr\u00f9ng c\u00e1nh c\u1ee9ng: Ips calligraphus <\/em>Germar, Ips <\/em>sp.<\/em>, Dendroctonus <\/em>sp.<\/em>: M\u1ecdt truy\u1ec1n n\u1ea5m x\u00e2m nh\u1eadp v\u00e0o c\u00e2y ch\u1ee7 l\u00e0m cho g\u1ed7 bi\u1ebfn m\u00e0u v\u00e0 g\u00e2y ch\u1ebft c\u00e2y. <\/p>\n

Tuy\u1ebfn tr\u00f9ng Bursaphelenchus<\/em> Fuchs: S\u1ef1 ph\u00e1 ho\u1ea1i c\u1ee7a tuy\u1ebfn tr\u00f9ng l\u00e0m cho c\u00e2y nhanh ch\u00f3ng h\u00e9o \u00faa v\u00e0ng r\u1ed3i l\u00e0m cho l\u00e1 \u0111\u1ecf v\u00e0 c\u00e2y ch\u1ebft.B\u1ec7nh g\u1ec9 s\u1eaft th\u00e2n th\u00f4ng: C\u00e2y b\u1ecb u b\u01b0\u1edbu, c\u00e0nh v\u00e0 ng\u1ecdn ch\u1ebft ng\u01b0\u1ee3c, th\u00e2n c\u00e2y x\u00f9 x\u00ec. <\/p>\n

T\u1eeb kh\u00f3a: <\/strong>Th\u00f4ng, s\u00e2u b\u1ec7nh <\/p>\n

I.<\/strong> \u0110\u1eb6T V\u1ea4N \u0110\u1ec0<\/strong> <\/p>\n

T\u00e0i nguy\u00ean r\u1eebng ng\u00e0y c\u00e0ng b\u1ecb suy gi\u1ea3m c\u1ea3 v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng do nhu c\u1ea7u v\u1ec1 l\u00e2m s\u1ea3n v\u00e0 \u0111\u1ea5t canh t\u00e1c c\u1ee7a con ng\u01b0\u1eddi ng\u00e0y c\u00e0ng cao, k\u00e9o theo h\u00e0ng lo\u1ea1t c\u00e1c \u1ea3nh h\u01b0\u1edfng x\u1ea5u v\u1ec1 m\u00f4i tr\u01b0\u1eddng sinh th\u00e1i. Theo Manraud tr\u01b0\u1edbc n\u0103m 1945, t\u1ef7 l\u1ec7 che ph\u1ee7 c\u1ee7a r\u1eebng n\u01b0\u1edbc ta chi\u1ebfm 43% t\u1ed5ng di\u1ec7n t\u00edch \u0111\u1ea5t \u0111ai c\u1ee7a c\u1ea3 n\u01b0\u1edbc nh\u01b0ng theo s\u1ed1 li\u1ec7u th\u1ed1ng k\u00ea n\u0103m 2000, t\u1ef7 l\u1ec7 che ph\u1ee7 \u0111\u00f3 ch\u1ec9 c\u00f2n l\u1ea1i x\u1ea5p x\u1ec9 32%. V\u00ec v\u1eady, kh\u00f4i ph\u1ee5c v\u00e0 ph\u00e1t tri\u1ec3n t\u00e0i nguy\u00ean r\u1eebng l\u00e0 m\u1ed9t y\u00eau c\u1ea7u quan tr\u1ecdng v\u00e0 c\u1ea5p thi\u1ebft, vi\u1ec7c l\u1ef1a ch\u1ecdn c\u00e2y tr\u1ed3ng l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng quy\u1ebft \u0111\u1ecbnh t\u1edbi s\u1ef1 th\u00e0nh c\u00f4ng trong c\u00f4ng t\u00e1c n\u00e0y. <\/p>\n

T\u00f4\u0309ng di\u00ea\u0323n ti\u0301ch r\u01b0\u0300ng tr\u00f4\u0300ng \u01a1\u0309 Vi\u00ea\u0323t Nam cho \u0111\u00ea\u0301n n\u0103m 2008 la\u0300 2.770.182ha; trong \u0111o\u0301 di\u00ea\u0323n ti\u0301ch r\u01b0\u0300ng tr\u00f4\u0300ng ca\u0301c loa\u0300i th\u00f4ng chi\u1ebfm kho\u1ea3ng 250.000ha (chu\u0309 y\u00ea\u0301u la\u0300 Th\u00f4ng nh\u01b0\u0323a, Th\u00f4ng ma\u0303 vi\u0303, Th\u00f4ng ba la\u0301 va\u0300 Th\u00f4ng carib\u00ea). Th\u00f4ng la\u0300 c\u00e2y co\u0301 gia\u0301 tri\u0323 kinh t\u00ea\u0301 cao. Chi Pinus bao g\u00f4\u0300m m\u00f4\u0323t s\u00f4\u0301 loa\u0300i th\u00f4ng chi\u0301nh nh\u01b0 Th\u00f4ng m\u00e3 v\u0129Pinus massoniana<\/em><\/em>Lambert,Th\u00f4ng nh\u01b0\u0323a Pinus merkusii<\/em><\/em>Jungh et.de Vries, Th\u00f4ng 3 la\u0301 Pinus kesya<\/em><\/em>Royle ex Gordon… <\/em>Ngoa\u0300i ca\u0301c sa\u0309n ph\u00e2\u0309m cu\u0309a th\u00f4ng nh\u01b0 g\u00f4\u0303, nh\u01b0\u0323a, nguy\u00ean li\u00ea\u0323u gi\u00e2\u0301y, c\u00e2y th\u00f4ng co\u0300n \u0111\u01b0\u01a1\u0323c s\u01b0\u0309 du\u0323ng trong vi\u00ea\u0323c phu\u0309 xanh \u0111\u00e2\u0301t tr\u00f4\u0301ng \u0111\u00f4\u0300i nu\u0301i tro\u0323c va\u0300 ta\u0323o ca\u0309nh quan m\u00f4i tr\u01b0\u01a1\u0300ng… chi\u0301nh vi\u0300 v\u00e2\u0323y di\u00ea\u0323n ti\u0301ch r\u01b0\u0300ng th\u00f4ng nga\u0300y ca\u0300ng \u0111\u01b0\u01a1\u0323c m\u01a1\u0309 r\u00f4\u0323ng va\u0300 la\u0300 m\u00f4\u0323t trong nh\u01b0\u0303ng c\u00e2y tr\u00f4\u0300ng chi\u0301nh cu\u0309a nga\u0300nh l\u00e2m nghi\u00ea\u0323p. <\/p>\n

Tuy nhi\u00ean vi\u00ea\u0323c g\u00e2y tr\u00f4\u0300ng va\u0300 pha\u0301t tri\u00ea\u0309n c\u00e2y th\u00f4ng cu\u0303ng g\u0103\u0323p nhi\u00ea\u0300u tr\u01a1\u0309 nga\u0323i, m\u00f4\u0323t trong s\u00f4\u0301 \u0111o\u0301 la\u0300 v\u00e2\u0301n \u0111\u00ea\u0300 s\u00e2u b\u00ea\u0323nh ha\u0323i, nguy c\u01a1 v\u00ea\u0300 s\u00e2u b\u00ea\u0323nh ha\u0323i th\u00f4ng kh\u00f4ng chi\u0309 xa\u0309y ra ta\u0323i r\u01b0\u0300ng tr\u00f4\u0300ng ma\u0300 co\u0300n xu\u00e2\u0301t hi\u00ea\u0323n ta\u0323i ca\u0309 v\u01b0\u01a1\u0300n \u01b0\u01a1m. Ri\u00eang v\u00ea\u0300 s\u00e2u ha\u0323i \u0111a\u0303 \u0111i\u00ea\u0300u tra \u0111\u01b0\u01a1\u0323c 45 loa\u0300i bao g\u00f4\u0300m ca\u0301c loa\u0300i s\u00e2u \u0103n la\u0301, s\u00e2u \u0111u\u0323c th\u00e2n, s\u00e2u \u0111u\u0323c no\u0303n\u2026 <\/p>\n

(K\u1ef7 y\u1ebfu H\u1ed9i ngh\u1ecb Khoa h\u1ecdc C\u00f4ng ngh\u1ec7 L\u00e2m nghi\u1ec7p v\u1edbi ph\u00e1t tri\u1ec3n r\u1eebng b\u1ec1n v\u1eefng v\u00e0 bi\u1ebfn \u0111\u1ed5i kh\u00ed h\u1eadu, trang 308-320)<\/em><\/em> <\/p>\n","protected":false},"excerpt":{"rendered":"

\nSâu \u0111u\u0323c no\u0303n thông<\/span>: <\/span>Rhyacionia cristata<\/span><\/em> Wals<\/span> and <\/span>Dioryctria rubella<\/span><\/em> Hamps<\/span>: \u1ede m\u1ed9t vài n\u01a1i, sâu róm thông \u0111\u01b0\u1ee3c coi nh\u01b0 là m\u1ed9t trong nh\u1eefng loài gây h\u1ea1i nghiêm tr\u1ecdng nh\u1ea5t \u0111\u1ed1i v\u1edbi r\u1eebng tr\u1ed3ng thông hai lá, gây thi\u1ec7t h\u1ea1i hàng tr\u0103m hecta r\u1eebng m\u1edbi tr\u1ed3ng.<\/span><\/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\/9617"}],"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=9617"}],"version-history":[{"count":1,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/9617\/revisions"}],"predecessor-version":[{"id":11071,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/posts\/9617\/revisions\/11071"}],"wp:attachment":[{"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/media?parent=9617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/categories?post=9617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vafs.gov.vn\/vn\/wp-json\/wp\/v2\/tags?post=9617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}