n:
Stf DUNG CHE PHAM TRlT SAU THAO M O C ST3 PHONG TRU"
BO XIT DAI Leptocorisa acuta T h u n b H A I LUA VU MUA*
Vu Quang Con, Ta Huy Thinh, Truong Xuan Lam, Nguyen Phuong Thao Vien Sinh thdi vd Tdi nguyen sinh vdt
Thuoc trir sau thao mgc ST3 dugc chiing toi san xuat tir cay thanh hao hoa vang Artemisia annua L. da dugc thir nghiem tren mgt so loai con trimg (Vii Quang Con et al, 1993); Luu Tham Muu et al, 1993). Thi nghiem gan day da dugc tien hanh tren doi tugng bg xit dai Leptocorisa acuta tni ngu trong 'vordn sau khi hai liia 'vu chiem (Vii Quang Con era/., 1993).
PHU'ONG PHAP NGHIEN CUtJ
Thuoc thao mgc ST3 do Vien Sinh thai va Tai nguyen sinh vat san xuat. Che pham ddng gdi d dang keo trong tiii nilon voi chi dinh 1 gdi pha trong 10 lit nuoc (5%).
Diem thi nghiem phong chong bg xit la tra liia miia mugn d xa Tan Lap, huyen Dan Phugng, tinh Ha Tay. Thuoc dugc phun bang binh bom deo vai ciia Tnmg Quoc vdi lieu lugng 20 lit tren 1 sao Bac bg (360m ), tren dien tich 2 sao vao thdi diem dau thang 10 nam 1993. Mgt sao liia khong dugc phun thuoc de lam ddi chiing. Ngoai ra cac can bo ky thuat ciia HTX da dong thdi phun che pham nay cimg lieu lugng tren 7 sao ciing tren cac tra liia miia mugn.
Mat do bg xit dugc tien hanh dieu tra truac khi phun thuoc 24 gid va sau khi phun thuoc 1 gid, 24 gid, 48 gid va 72 gid. Mat do bg xit dugc tinh bang so lugng bg xit trung binh/1 khdm lua, theo dieu tra cheo gdc 20 diem/sao, moi diem dieu tra 10 khdm.
Hieu qua ky thuat ciia thuoc dugc tinh bang cong thiic Henderson-Tilton (Cong ty Thuoc sat triing Viet Nam - 1990).
Cac tac gia chan thanh cam on ban chii nhiem va can bg ky thuat HTX Tan Lap da phoi hgp trien khai phong trir bg xit dai hai liia can thu hoach bang thuoc trir sau thao moc ST3. Cong trinh dugc thuc hien duod sir ho trg ciia de tai KNOl-03 va de an
"Thuoc trir sau thao moc", ciia Trung tam Khoa hgc tu nhien va Cong nghe quoc gia.
KET QUA VA THAO LUAN
Ket qua dieu tra bg xit dai tren liia truoc khi phun thudc 1 ngay cho thay mat do bg xit tren cac thira rugng se phun thudc va ddi chiing la cao va xip xi nhau (1,03 va 1,01 con/khdm - tuong duong 40 con/m^).
*Da dugc ddng trong Tap chi Sinh hoc 9 - 1993, 15(3), tr. 11-16.
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Sau khi phun thuoc 1 gid, sd lugng bg xit song sdt tren thiia rugng thi nghiem giam rd ret va mat do bg xit xuong thap nhat vao ngay hom sau. Trong khi do tai rugng doi chiing mat do bg xit lien tuc gia tang trong 5,ngay dieu tra do sir tap tnmg bg xit vao tra Ilia mugn khi cac tra liia khac dang gat (xem hinh). Vi vay, mac du mat do bg xit d rugng thi nghiem nhich din len trong cac ngay thii 3, thii 4 sau khi phun thuoc, nhung qua xii ly toan hgc cho thiy hieu qua ciia thuoc ST3 vin duy tri tdt vdi ty le chet dat tren 60%o sau khi phun thudc 72 gid (xem bang). KSt qua thu dugc ciia chiing toi trong thir nghiem nay ciing tuong diiong vol hieu qua diet bg xit ciia ST3 khi chiing tni ngu trong vudn giira hai vu chiem - mua nam 1993 tai cimg diim nghien cuu - khi do ty le chet dat 66,72% sau 24 gid phun thudc (Vu Quang Con et al, 1993). DiSu do ndi len hieu qua diet bg xit ciia che phim ST3 la b6n viing va che phim nay cd thd su dung diet bg xit ca tren dong rugng va noi tni ngu ciia chiing giiia hai vu liia. Dong thdi can bg cua HTX Cling da danh gia hieu qua cua ch§ phim ST3 len bg xit d 7 sao phun thuoc do chinh can bg ky thuat ciia HXT tu phun. K6t qua cho thiy, mat do bg xit d cac thua rugng nay xudng thip, con 0,43 con/khdm sau khi phun thudc 24 gid, nghTa la dat hieu qua tuong duong vdi thir nghiem ciia chiing tdi. Theo doi nhiing ngay tiep theo cho thay so lugng bg xit tren toan bg cac thua rugng phun thuoc van giir d miic thap.
KET LUAN " •
Ch6 phim thudc trii sau thao mgc ST3 do Vien Sinh thai va Tai nguyen inh vat san xuit cd hieu qua diet bg xit Leptocorisa acuta va cd the su dung dS phong trir chiing tren canh dong.
Thiol gian sau khi phun thuoc Higu qua thCf thuoc ST3
Sau 1 gia 52,33%
Sau 24 gia 70,22%
Sau 48 gia 69,85%
Sau 72 gia 61,26%
Mai do (conAhom) 1.6-
1.2.
0.8-
0.4-
-tr — - - - t r -
, - - t i .
br—^ Doi chdng o—-o Phun thud'c
Trade Sau Sau Sau Sau 24 gid 1 gid 24 gid 48 gid 72 gid
Thdi gian trade va sau khi pt^un thuoc
Diin bien mat do (con/khdm) cua bg xit ddi hgi lua Leptocorisa acuta d cdng thiec thir nghiem thudc thdo mgc ST3
168
TAI LIEU THAM KHAO
1. Cong ty Thu6c sat trung 'Viet Nam, 1990: S6 tay su dung nong dugc, NXB. Khoa hgc vd Ky thuat, HdNgi.tr. 110-133.
2. Luu Tham Muu, 'Vu Quang Con, Dao "ViSt Phii, Ngo Tuin Ky, 1993; Tac dung diet con trung cua phS thai cong nghe chi6t xudt Artemisinin. Bao cdo khoa hgc, Hgi nghi B'VT'V, 24 - 25/3/1993, NXB.
Nong nghifp, tr. 34.
1. 'Vu Quang Con, Luu Tham Muu, Ddng Thj An, Truong Xuan Lam, 1993: Bu6c ddu thii nghiem va tdch chi6t cdc hgp chdt ti!r cay thanh hao hoa vang (Artemisia annua L.) vd kiem tra tdc dung cua chiing len mgt s6 con triing hai va Igi. Bdo cdo khoa hgc, Hgi nghi khoa hgc B'VTV. 24 - 25/3/1993, NXB. Nong nghiep, tr. 31 - 32.
2. Vu Quang Con, Luu Tham Muu, Ta Huy Thinh, Ddng Thj An, Truong Xuan Lam, 1993: K6t qua sii dung thuoc trii sau thao mgc tir cay thanh hao hoa vdng (Artemisia annua L.) de ph6ng trir mgt so con triing hai Itia can thu hoach. Tap chi Bao v? thuc vat, s6 5 -1993, (131), tr. 11 -14.
SUMMARY
Use of Artemisia preparation ST3 for control of Leptocorisa acuta Thunb on rice - field
The Artemisia preparation STB produced by Institute of Ecology and Biological Resources was used for control of Leptocorisa acuta on rice-field in Octorber 1993. The preparation In 5%
was sprayed at dose 20l/360m^ on 3240m^ of experiment rice field. The Leptocorisa density.
Hardly lessened after spraying and the ST3 effect on Leptocorisa acuta was prolonged just for three days (70.22%; 69.85%; 61.26% after spraying 24h, 48h, 72h respect).