CHI CVC BVTV TINH KON TUM CQNG HOA XA HOI CHU NGHIA VIET NAM TRAM BVTV THANH PHO 1:14 14 - Ty. do - Hanh phtic

Si: 05/TBSB - BVTV ***

TP Kon Turn, ngay 25 thang 8 nam 2015

THONG BAO V Au p4.1; 7 u nh sau, benh hai teen cay hia va bien phap phOng trir

........ DEN

rki45-Qua.c g tac di'eu tra sau, benh dinh kY hang tuAn, Tram Bao ve thkxc vat ...... tharTh .pho-K n Turn thong bao tinh hinh sau benh hai tren cay lua nuojc va met so

ng trir. I. Giai doan sinh truirng: lua clang o giai clop: de nhanh - dirng cai, lam

Bong II. Tinh hinh ray Ilan, sau cam la nho, benh kilo van gay tren cay hia

nureec va bien phap phong, trir I. Ray Watt: Hien nay ray nau xuat hien ten hau het dien tich lira cua cac xa phuong, voi

mat d8 450 - 700 con/m2, tuo'i 1-2. RAy nau co kha nang bung phat va gay hai mph trong th6i gian, tai vi cay asgiai doan clung cai, lam clang than cay xOp mem, ng9t n'en ray rat Ira thich va ,dieu kien th6i tiet mua, nang xen rat thich hop cho skr sinh twang va phat trien dm ray nau. Dac biet, ray nau la dai tugng khO ph6ng trir; c6 kha nang khang thuoc cao; toc do sinh san nhanh,, ca. ray non va ray truong thanh deu c6 kha nang gay hai cay lua. Neu mat de ray ,cao, khong ducp diet trix kip theri, &Ong lot thi co the gay nen hien tugng chay ray lam thiet hai nhieu tai nang suat, chat luting lira hoac that thu hoan toan

- flat diem hinh thcii va kip tinh song: + Ray twang thanh mau nau, nhO (dai khoang 5mm), c6 dang,canh dai, che

het bung va c6 clang canh ngan kh8ng che het bung. Dang canh ngan 'thong bay dugc, barn tren goc lua de gay hai va sinh san; khi gap diet' kien thieu thirc an thi xuat hien loci hinh canh dai a di chuyen sang vimg khac. Dang canh dal co kha nang bay manh va bay,xa.

+ Trung hinh bau chic hai cong, rat nh6, de cam vao gan chinh hoac be la, phat hien bang cach tach be cho co vet than se thy trung co mau trang xep thanh 1-2 hang khoang 10-15 trung. RAy cai truong thanh CO kha nang de 150 - 300 trang, trung na sau 6 - 7 ngay.

+ RAy c6 5 tuOi (let xac 4 lan) tir 12 - 14 ngay. RAy twang thanh song 7 -14 ngay

- EYic diem gay hai: Ray nau la loci chich hut, ca ray non va ray truong thanh chic y6u tap tr-ung phia g6c lira chich hiat nhkra cay lam cho cay sinh truang kern, la lua yang, nang suat giam, neu mat do ray cao c6 the dan den cay lua bi

chay kh6 (chay ray) se thAt thu hoan Wan., RAy thtrang phat sinh nhang rung lira tot, mat d6 gieo sa day, giong khong ray kern.

+ Bien phdp sinh h9c: Bao ve cdc lodi thien dich cira ray nau nhu ongl4T sinh, bo xit rurac, b9 rUa, nhen bat m6i, nAm ky sinh,

+ Bien phap canh tdc: Bon phan can doi N.P.K, khong bOn thira darn va khong bOn dam muon.

+ Bien phdp hod h9c: Sir dpng cdc loci thuoc hod h9c de phun nhu: Penalty 40WP; ,Chess 50WG; Actara 25WG,; Cofidor; Regent 0.2G, 0.3G, SSC, 800WG; vv... (nong d6, lieu ltrang va cach sir dung theo khuyen cdo ghi tren nhan thuoc)

Cho - Khi phun thuoc can dtra voi phun xuong phan dtrai goc cay lira de thuoc

tiep 'arc dugc voi ray lam tang hieu 1pc trir ray cila thuoc. Nen phun thuoc vao nhang lirc,trai mat

- Neu ruOngschir ding dugc nguon nu& thi nen duaprot trong rung dang cao khoang V2 chieu cao cay lira, ray se tap trung len phan ng9n cay lira de khi phun thuoc, thuoc tiep x6c trpc tiep voi ray, hieu qua diet tit se cao .

- Can tien hanh phun thuoc Tong lag de hp the sr di chuyen dm ray - Khong nen pha tr6n, h6n h9p nhieu loci thuoc de phun - Sir dung luan phien cdc loci thuoc (de tranh hien tuang khang thuoc cUa

ray nau). 2. San cdin Ia nh6: Sau cu6n la nho xuAt hien va gay hai khd phi bien ten dien tich lira, voi mat

d6 trung binh 3 — 5 con/m2, tu6i 1- 3, o giai doan dirng cai - lam clang cay lira khong con kha nang ra la mai a den bu cdc la bi sau pha hai, sau hai lam anh huang den qud trinh quang hop dm cay dan den giam nang suat, chAt luang

- Dac diem hinh thai: Sau non mau xanh ng9c, tu6i 5 day six dai 12-19 mm va hoat ding rat linh boat. Ngai nh6 mau nau yang, than dai 10-12 mm, mep ngodi canh co throng vien mau nau sam hoac xdm, canh co 2 van ngang hinh lanssong mau nau dam, ngai thuang hoa vao ban dem, de trUng rai rdc tren ye ban dem, m-6i con cdi de tren 50 trimg.

Trdng hinh bau dpc mau trang dpc khi gan no chuyen mau yang nhat. - Dac diem gay hai: + Sau throng cuon tron la lira, nam ben trong va gam lop diep 1pc con de 1a.i

lop bieu bi o mat duai Id. Sau thuang gay hai giai clop Kra de nhanh den giai doan lira ngam stra, gay thiet hai nang nhAt giai doan lira lam dung va sau trO. Sau pha hai Id lam giam dien tich quang h9p cna lira, anh huang den sir phdt trien cua clang, lam giam trong luting hat, tang tS, le lep, king, nang suat lira giam. Cdc giong lira c6 ban Id to, ring, lira tot thuang bi hai nang.

+ Chu kS' phat trien cua sau: Trirng 5-7 ngay, Sau non 18-25 ngdy, nh6ng 6-8 ngay, truing thanh 2-6 ngay.

- Bien phdp ph6ng trtr:

+ Bien phap sinh hoc: Duy tri bao ve thien dich cua sau cu6n la nho nhu cdc loai nhen, ong ky sinh, chu6n chuck', kien ba khoang,

+ Bien phdp canh tdc: Khong nen gieo sa qud day. Chi nen gieo, sa khoang 100-120 kg giong cho mot ha la vita (neu dUng may sa hang luting giong chi can khoang 70-80 kg).

Cham sac lua tot tit giai doan ma de lua tang kha nang den bu Id. Bon phan can de;i, 119131)",. Ruing va bo rung phai sach c6 dai. Thuong xuyen giam sat sau ngoai d6ng ru6ng, chi )", nhat giai doan lila lam

&rig, tr6 bong. + Bien phdp hod h9c: Ngu'ang phong trir cua giai doan lua sinh truing dinh

duang thi TLH dat 20%, giai dog' sinh twang sinh thuc TLH la 5% (la bi hai la ld vira bi cuon lai, vixa c6 sau non ben trong). Khi mat d6 sau vuo:t qud ngtfOng phong trir thi tien hanh xir 17 bang mot trong cdc loai thuoc sau nhu: Karate 2.5EC, Rotoc 555EC, Cotoc 555EC, Supertac 500EC, Cyperan 5EC, 10EC, 25EC Vibaba 50ND, Vibasu 40ND, 50ND, Padan 95SP,... phun deu diet sau hieu qua, nit& la khi sau con nho.

3. BOh kilo yin Benh khO van gay hai cpc 136 tren dien tich khodng 0,5ha lua tai phuOng

Nguyen Trai, vii tS, le hai 15 — 20% (cap 1-5) - Tdc nhan gay benh: Do nam Rhizoctonia solani. - Trieu Benh gay hai chu yeu ten be ld, trong truing hqp benh nang

c6 the phdt sinh tren phien ld. Vet benh dau tien ten rung thuOng xuat hien be ch8 goc lua gidp mat nuot co hinh, bAu dk.ic dai khoang 5-10 mm, mau xanh

xam nhat, sau do vet benh len c6 the dai tai 2-3, cm, kich thuac nho khong deu gifia vet benh mau xanh xdm, xung quanh vin nau dam, van veo, khong co hinh clang ro ret. G4p dieu kien thu4n lgi vet benh lan ring khap be la, lan dan len phien ld va ca cdc la phia tren lam la yang ri.1 va kho rac, trong dieu kien am uot, sgi nam m9c day ten vet benh. Tren ru6ng, benh xuat hi'en thanh tirng O, sau dO c6 the lan ra ca ruOng, lam giam nang,suat nghiem trong.

- Dieu kien Oat sinh, phat trien: + Benh kilo van phat trien manh trong dieu kien nhiet dO, am d6 khong khi

cao, rung haa gieo sa day, bon phan khOng can d6i. Benh thuOng phat sinh khi lua o giai doan de nhanh toi da, phdt trien manh tix khi lua c6 (long den trO.

- Bien phdp phong trir: + Khong c6 giong khang dugc benh kho van, tuy nhien can chin gi6ng sach

benh de gieo cay. + Sau khi thu ho4ch cay lat dAt sem va ngam ntrot mot thoi gian de han the

hach va sgi nam. + Gieo cay mat d6 vita phai, khong bon phan darn nhieu, khOng bOn thirc

muon, chU )", bon can d6i giaa dam, lan va ka

+ Khi l*rh Oat trien nen cho them nu& \Tao rung haa \id phun thuoc trir nam bang mot trong cac thuoc dac hien nhu: Validacin 3L, 5L; Anvil 5SC, Vicarben 50SC, vv...

Ngoai ra,,tren cay lua hi'en nay con có mot so (16i tugng dich hai khac nhu: doi duc la, sau cuon la lon, tuyen tang re, nghet re sinh ly, benh dao on,.. nhung hai mirc d6 thhp

Nhhn dugc thong bao nay, d nghi cac dia phuong, thong bao, tuyen truy& cho ba con nong dan bang nhieu hinh thirc nhu: qua h" th6ng loa,phOng thanh cua then, lang, to dan pho; photo giri cho cac them, lang, dan Oro de tuyen truyen toi be con n6ng dan kip thai. NIL dOng bh con tich cuc kiern tra dong ru'6ng, phang trir dich hai kip thei (dac bit chu )", den: ray nau, sau cuon la nho, benh kilo van) khong de lay lan, bung phat ten din rOng.

D'e nghi cac dia phuong trong qua trinh thuc hie'n cac bin phap )(Cr 1± cac d6i tugng dich hai, ne'u có kho khan wrong mac lien he vori Tram Bao ve thgc vat thanh pho Kon Turn, dia chi: 54B-Tran Hung Dao, thanh pho Kon Turn; so din thoai: 0603.861821 de ph6i hop xf.r1)"/

Nai nhC2n: TRAM BAO VE THUC VAT THANH PHO KON TUM

TRAM TRUUN(;

- Chi cuc BVTV tinh Kon Turn (b/c) - Thanh Cry Kon Turn (b/c) - UBND thanh pher Kon Turn (b/c) - D/c Ho Van DA — PCT UBND TP (b/c) - Phong Kinh t" thanh pho (p/h) - Dai PT-TH thanh pho (dua tin) - UBND cac xa, plurang