KHOA HOC CONG NGHE
IXIGHIEIXI CUU HIEU LUC CUA HiOT SO LOAI THUDC BAO VE THUC VAT DOI VOI CAC LOAI IXJAIU GAY BEIXIH
RUIXIG LA IVIUA HiUA C A Y CAO S U [Mei/ea bramNiensi^ O VUIXIG DOIXlii IXIAIVI BO
Dam van To^n^- ^ Ph^m Quang Thu^
T6MTAT
Trong CO- cau cay trong d vimg D6ng Nam bo, cay cao su {Hevea brasiliensis) la cay cong nghifip giii vai tro rat quan tiong. Cung nhu nhi^u loai cay trdng khac, cay cao su dang bi nhidu loai benh gay hai tan cong, lam giam dang ke nang suat va chat luung mu vudn cay, trong do co benh rung la mua mua. Nghign ciiii kha nang uc chd niim gky b6nh rung la miia mua cay cao su lam co sd dd nghidn cim quan ly benh hieu qua.
Co 3 loai thudc boa hoc co kha nang lic che nam rat manh vdi ca 5 chiing nam gay bSnh (Pbytophthora heveae VN739, Pbytophthora nicotianae VN722, Pytliium sp. VN602, Phytopythium sp. VN596 va Phytopythium sp. VN604) la Agrifos 400, Ridomid Gold 68WG va Lanomyl 680WP. Thudc Tilt super 300EC CO kha nang uc chd rat manh voi Pbytophthora nicotianae VN 722 va Pbytophthora heveae VN739 nhung clii lie che manh voi chung Phytopythium sp. VN604, Phytopythium sp. VN596 va chiing Pythium sp.
VN602. Thudc sinh hoc Sat 4SL va Biobus l.OOWP chi ice chd manh vcn chung Pbytophthora nicotianaeYH 722 va Phytopythium sp. VN604 theo thii tir.
Tir kh6a: Cay cao su, Pbytophthora, Phytopythium, Pythium thudc tni benh.
1.BATVANDE
Cay cao su (Hevea brasiliensi^ la eay eong nghiep dugc frdng nhidu noi tren thd gidi nhu An Dp, Trung Quoc, cac nude Dong Nam A, khu vuc Nam My... Cung nhu nhidu loai cay trdng khac, cay cao su dang bi nhieu loai sinh vat tan cong, lam giam dang ke nang suat. Theo Chee (1985) cd khoang 550 loai vi sinh vat gay hai cho cay eao su a Malaysia, trong dd cd 24 loai gay thiet hai dang ke ve kmh te. Q Thai Lan, benh phan trSng lam giam san lupng mil eao su len tdi 45% (Liyanage etal, 2017). 6 Viet Nam, cay cao su duoc trdng chu ydu d vung Dong Nam b6 va ed 19 benh hai tan cong, trong do cac benh hai quan trpng nhu benh phan trdng, benh nam hdng va benh do nam thuoc chi Phytophthora gay ra (Duong etal, 1998). cac loai Phytophthora tan cong nhidu loai thuc vat va la vat gay benh cua nhieu loai benh cd miic dp pha hoai Idn nhat tren thd gidi (Kamoun et al., 2015; Erwin va Ribeiro, 1996). Tren cay cao su, cac loai nam Phytophthora la tac nhan gay nhidu loai benh nhu: loet soc mat cao, benh thdi vd va nhat la benh rung la miia mua. Benh rung la miia mua cd thd lam giam 30 - 50% san luong mil cao su khi nhidm nang (Phan Thanh Dimg va cong su, 2014; Nguydn
So Khoa hgc va Cong nghe tinh Binh Phuoc
" Nghien cini sinh Vien Khoa hgc LSm nghiep Viet Nam
^ Tmng tam Nghien cuu Bao ve rirng, Vien Khoa hgc Lam nghiep Viet Nam
Anh Nghia, 2016). O Viet Nam, da cd nhung nghien cuu dd xac dinh nguyen nhan gay benh rung la miia mua cay cao su va bude dau cac nha khoa hpc da xac dinh dupe 3 loai nam Phytophthora patnivora, Phytophthora botryosa vk Phytophthora sp. la sinh vat gay benh chinh (Duong et al., 1998; Dang Vu Thanh et al., 2004). Nhimg nghien ciiu gan day vao nam 2017 cho thay mot sd loai nam khac thuoc hp Pythiaceae gdm: Phytophthora nicotianae, Phytophthora heveae, Phytopythium spl., Phytopythium sp2., Pythium sp., cung dupe xac dinh la nguyen nhan gay benh rung la miia mua ddi vdi eay cao su d viing Dong Nam bp (Dam Van Toan et al, 2017). De giam thieu anh hudng cua benh, nang eao hieu qua kinh td cua cay cao su thi viec nghien cuu tim ra cac bien phap de phdng tni benh hieu qua la viec lam cap thiet. HiSn nay, viec phdng tni benh rung la miia mua cay cao su da dupe cac nha khoa hgc trong va ngoai nude nghien ciiu. Ben eanh eac bien phap phong tni khac nhu su dung cae gidng cao su khang benh, ap dung cac bien phap canh tac hpp ly... thi phuong phap su dung cae chat hoa hoc cung la bien phap cue ky quan trpng. O An Dp, Malaisia va Sn Lanka dung dich oxyclorua dong dupe sii dung rpng rai trong phdng trir benh rung la eay cao su (Jayasinghe va Jayaratne, 1996). Metalaxyl, oxadixyl, catafol, folpet hoac mancozeb dupe dd nghi dimg trong viec quan ly benh cay cao su do nam
KHOA HOC CONG NGHE
Phytophtiiora (Tan, 1983; Jayatissa etal, 1994; Jacob et al., 1995). 6 An Dp, 0,8% axit phosphoric da cd hieu qua ca vd mat phdng \xu benh va kmh te h-ong phong trir benh loet spe mat cao eay cao su do nam Phytophthora khi ap dung phun thudc hang tudn Cacob et al, 1995). Nghien eiiu cua Burgess L.
(1999) cho thay thudc photphonates ndng do 2% ed hieu qua cao tieu diet nam Phytophthora gay henh.
Summerell D. va Burgess L. (1999) cho rang vdi cay than gd nhu sau rieng, cay bo, cao su... khi bi nam Phytophthora gay hai thi bien phap tiem thudc Phosacide 200 cho eay 1 - 2 lan/nam cd hidu qua phdng trii benh cao. Benh chdt nhanh gay thdi re do Phytophthora capsici, dieu tri bang metalaxyl hoac axit phosphoric, fosetyl-AI rat ed hieu qua (Manohara va Rizal, 2002; Wong, 2002). Thudc chiia hoat chat Phosphonates ed tac dung phdng trir nam thuoc bp Peronosporales. Mot dang dac trung cua phosphonates la Fosetyl-Al, ten thuong mai la Ahette, hdn hop chiia mudi nh6m eua Phosphonate (Cohen va Coffey, 1986). Hien nay d Viet Nam, thudc Agrifos 400 CO hoat chat la axit phosphoric la loai thudc dac
tri nam Phytophthora. Theo Phan Thanh Dung va cong su (2014), Nguydn Anh Nghia (2016) sir dung hdn bop cua metalaxyl + mancozeb (Vimonyl 72BTN, Mexyl 72WP...) ndng dp 0,2% cd kha nang phdng tni henh rung la miia mua cay cao su.
Nghien ciiu nay tinnh bay ket qua thu nghiem hieu luc lie che mot sd loai thudc bao ve thuc vat ddi vdi cac loai nam gay benh rung la miia mua cay cao su d viing Dong Nam bp trong dieu kien in vitro.
2 . VAT UEU VA PHUONG PHAP NGHIEN CUU 2.1. Vat h$u nghidn c i ^
Mot sd chimg nam trong hp Pythiaceae gay benh rung la miia mua tren cay cao su tai Dong Nam bp, dupe phan lap tai Trung tam Nghien cihi Bao ve rimg, Vien Khoa hoc Lam nghiep Viet Nam gom:
Phytophthora heveae VN739, Phytophtiiora nicotianae VN722, Pythium sp. VN602, Phytopythium sp. VN596 va Phytopythium sp.
VN604.
Cae loai thudc hda hpc va sinh hpc duoc dimg thi nghiem cd hoat chat va ndng dp nhu sau:
Hoat chat Metalaxyl M 40 g/1 + mancozeb 640 g/1 Chlorothalonil 75%
Difenoconazole 150 g/1 + propiconazole 150 g/1 Potassium phosphonate 400 g/l
Fosetyl aluminium 800 g/kg
Mancozeb 640 g/kg + metalaxyl M 40 g/kg Cytosinpeptidemyein 4%
Trichoderma viride 1%
Nude la
Ten thuong mai thudc bao ve thue vat Ridomid Gold 68WG Daconil 75AVP Tdt super 300EC Agnfos 400 Ahette 800WG Lanomyl 680WP Sat 4SL Biohus l.OOWP Ddi chiing
Ndng dp (mg thudc/ml nude) 6,25 mg/nil 3,0 mg/ml 1,0 pg/ml 10,0 pg/ml 3,13 mg/ml 3,0 mg/ml 0,94 mg/ml 1,0 mg/ml 2.2. Phuang phAp nghien cuu thii hieu l^c cua
cac loai thudc
Thi nghiem dupe tien hanh vdi 9 cong thiic trong dd cd 8 loai thudc bao ve thuc vat va 1 cong thiic ddi chiing ddi vdi cac loai nam gay benh rung la miia mua gdm: P. heveae VN739, P. nicotianae VN722, Pythium sp. VN602, Phytopytiiium sp.
VN596 va Phytopythium sp. VN604. Ndng do duoc pha theo khuyen cao ciia nha san xuat. Thi nghiem duoc tien hanh theo phuong phap khuech tan thudc tren moi trudng nuoi eay nam. Khoan mot Id dudng kinh 10 mm d giua dia Petri cd moi trudng PDA da hap khu trung, nho 5 ml cac loai thudc bao ve thuc vat theo cac cong thiic thi nghiem vdi ndng dp theo khuyen cao cua nha san xuat, sau dd eay nam
d 3 diem gdc dia tao thanh mot tam giac. Sau 3 - 5 ngay danh gia hieu luc khang nam benh eua cac eong thiie thi nghiem tren moi trudng PDA bang viec do dudng kinh vdng lic che su phat trien ciia nam theo hai chieu vuong gdc (Dmm). Mdi cong thiic thi nghiem tidn hanh d 30 dia Petri, thi nghiem dugc lap lai 3 lan. Hieu luc khang nam cOa thudc bao ve thue vat dupe phan thanh 5 cap dua ti-en dudng kinh vdng lic chd (Dmm) nhu sau:
D < 1 mm: Khong cd kha nang lic ehe (-).
1 mm < D < 5 mm: Kha nang lic che yeu (+).
5 mm < D < 10 mm: Kha nang lic ehe trung binh
(+-H).
10 mm < D < 20 mm: Kha nang lie che manh (+++).
92 NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 + 2 - THANG 2/2019
KHOA HOC CONG NGHE D > 20 mm: Kha nang lic che rat manh (++++).
3. KET QUA NGHBU CUU VA THAO LUAN
3.1. Hi^u luc thudc bao vd thuc vat vdi cdc chung n i n Phytophthora
Cd hai chung nam thuoc chi Phytophthora gay benh rung la miia mua cay cao su phan lap dupe d Dong Nam bp do la: PhytophthoranicotianaeNW22
va Phytophthora heveae VN739. Day la 2 loai njim chinh gay benh rung la miia mua d eac tinh Dong Nam bp. Kdt qua thu hieu luc thudc hao ve thuc vat vdi cac chung nam Phytophthora dupe trinh bay d bang 1.
Bang 1. Hieu luc thudc vdi cdc chung n ^ thuQc chi Phytophthora Tl
1 2 3 4 5 6 7 8 9
T&n thuoc Ridomid Gold 68WG Daconil 75WP Tilt super 300EC Agnfos 400 Ahette 800WG Lanomyl 680WP Sat 4SL Biobus l.OOWP Doi chung Lsd Fpr
Phytophthora nicotianaeNin22 D(cm)
5,32"
1,53'
^SO*
Me*
1,43' 2,34' 1,88'' 0,83'' 0,00- 0,256
<0,001
Hi^u lut ++++
+++
++++
++++
+++
++++
+++
+
Phytophthora AeFeaeVN739 D (cm)
3,87' 1,25' 2,67'' 6,40«
1,21'' 2,98' 0,95'' 0,16' 0,00"
0,261
<0,001
Hieu luc ++++
+++
+-H-+
++++
+++
4^-++
+ +
Ghi chu: tiong cimg mot cot nhiing gia tri trung thdngke theo tide nghiem Duncan dmucdo 0,05.
Bang 1 cho thay tat ca 8 loai thudc deu cd kha nang lie ehe nam Phytophthora nicotianae VN 722.
Trong dd cd 4 loai thudc ed kha nang lic ehe nam rat manh do la Agrifos 400, Ridomid Gold 68WG, Lanomyl 680WP va Tilt super 300EC; 3 loai tiiudc ire che manh la Daconil 75WP, Ahette 800WG va Sat 4SL, trong do cd 1 loai thudc cd ngudn gdc sinh hoc la Sat 4SL; 1 loai uc che yeu la thudc sinh hpc Biobus l.OOWP. Cd 8/8 loai thudc cd kha nang lie che nam gay benh P. AeKeaeVN739, h-ong dd Agrifos 400, Tilt super 300EC, Ridomid Gold 68WG va Lanomyl 680WP la 4 loai thudc hda hoc cd kha nang lic ehd nam rat manh. 2 loai lie ehe manh la Daconil 75WP va Aliette 800WG. 2 loai thudc sinh hpc cdn lai deu d dang lie ehe yeu va trung binh (Hinh 1), Ket qua nay tuong tu vol kdt qua nghien ciiu cua Tan (1983), Jayatissa va eong su (1994), Jacob va cdng su (1995), Cohen va Coffey (1986), Phan Thanh Dung va cong su (2014), Nguydn Anh Nghia (2016), ddu eho thay thudc chiia hoat chat phosphonates, metalaxyl va mancozeb hoac hdn hpp cua chung ed kha nang phdng trir benh do nam Phythophtora rat hieu qua.
Ket qua phan tich thdng ke a hang 1 cUng cho thay, hieu luc lie che nam benh ciia cae loai thudc bao ve thuc vat dua vao thi nghiem khae biet nhau ro ret.
binh cimg ky tu khdng khic biet co y nghia vS m$t
Hinh 1. Hieu luc thudc bao vd thuc vat ddi vdi die chiing n ^ Phytophthora A: Hieu luc lie che cua Agrifos 400 ddi vdi chung P. nicotianaeNW22. B: Hieu luc lic ehe ciia Agrifos 400 ddi vdi chting P. heveae VN739. C: Hieu luc lic che cua Ridomid Gold 68WG ddi vdi ehiing P.
nicotianae VN722. D: Hieu luc lie che ciia Ridomid Gold 68WG ddi vdi chung P. Aereae VN739. E: Hieu luc lie che cua Lanomyl 680WP ddi vdi chung P.
AeKeaeVN739. F: Ddi chimg.
KHOA HOC CONG NGHE
3.2. Kdt qua thir hidu luc thudc trSn mlu nam Pythium va Phytopythium
Cd 3 chung nam thudc 2 chi Pythium vk Phytopythium gky benh rung la miia mua cay cao su phan lap dupe d Ddng Nam ho dd la: Pythium sp.
VN602, Phytopythium sp. VN604 va Phytopythium sp, VN 596. Ket qua thu hieu luc thudc hao ve thuc vat vdi cac chung nam Pythium va Phytopythium dupe trinh bay d hang 2.
TT 1 2 3 4 5 6 7 8 9
Bang 2. Hi^u lire thu6c v6i cac
Ten thuoc Ridomid Gold 68WG Daconil 75WP Tilt super 300EC Agrifos 400 Ahette 800WG Lanomyl 680WP Sat 4SL Biobus l.OOWP Doi chung Lsd Fpr
chung nam Pythium sp.
VN602 D (cm) Hifeu luc
2,38' I++++
0,83' 1,06' 5,15' 1,16' 2,11'' 0,00"
++
+++
++++
+++
++++
thu6c chi Pythium va Phytopythium Phytopythium sp.
VN604 D(cm)
4,15' l.VS' 1,88' 5,51' 1,12'' 2,16'' i 0,00' 0,00- 1
0,00"
0,162 1
<0,001 1
1,79' 0,00' 0,119
<0,001 Hieu luc ++++
+++
+++
++++
+++
++++
+++
Phytopythium sp.
VN596 D(cm)
5,17"
0,86' 3,67' 5,231!
1,08'' 2,10' 0,00"
0,71'' 0,00' 0,08
<0,001 Hieu luc
++++
++
++++
++++
+++
++++
++
Ghi chu: trong cimg mot cot, nhimg gia tri trung thdngke theo trie nghiem Duncan a muc dd 0,05.
Bang 2 cho thay, co 6/8 loai thuoc co kha nang lie che nam Pythium sp. VN 602, trong do c6 thuoc Agnfos 400, Lanomyl 680WP va Ridomid Gold 68WG lie che rat manh, thuoc Tilt super 300EC lic che manh, 1 loai thuoc lie che trung binh va 2 loai thudc sinh hoc la Sat 4SL va Biobus l.OOWP khong CO kha nang lic che. Co 7/8 thuoc co kha nang lie chd vm nam Phytopythium sp. VN604, trong dd Agrifos 400, Lanomyl 680WP va Ridomid Gold 68WG lie chd rftt manh, cdn 4 thudc lie che manh la Daconil 75WP, Tilt super 300EC, Aliette 800WG va thudc sinh hoc Biobus lOOWP. Cd 7/8 thudc lie che nam benh Phytopythium sp. VN596 frong dd cd 4 loai thudc lie che rat manh la Agrifos 400, Ridomid Gold 68WG, Lanomyl 680WP va Tilt super 300EC, thudc Aliette 800WG lie che manh cdn 2 loai thudc ilc che trung binh. Rieng thudc sinh hoc Sat 4SL khdng cd kha nang lic chd (Hinh 2). Nhu vay, kdt qua nghien ciiu cho thay cac thudc hda hoc cd hoat chat phosphonates rat cd hieu qua trong viec lic chd cac loai nam thudc ho Pythiaceae, ket qua nay tuong tit nghien ciiu cua Cohen va Coffey (1986), Manohara va Rizal, 2002; Wong, 2002. Kdt qua phan tich thdng ke tai bang 2 cho thay, kha nang lie che nam bdnh
binh cung ky tu khong khac hiet CO y nghia re' mat cua cac loai thudc bao ve thuc vat la khac nhau ro ret.
Hmh 2. Hidu luc thudc bao vd ihi^c vat ddi vdi c ^ chiing nam Pythium va Phytopythium A: Hieu lire lie chd ciia Agrifos 400 ddi vdi Pythium sp. yN602. B: Hieu luc lic che ciia Agrifos 400 ddi vdi Phytopytiiium sp.VN604. C: Hieu luc lie chd cua Ridomid Gold 68WG ddi vdi Pythium sp.
VN602. D: Hieu luc lie che ciia Ridomid Gold 68WG ddi vdi Phytopythium sp.VN604. E: Hieu luc lic che cua Ridomid Gold 68WG ddi vdi Phytopythium sp.
VN596. F: Ddi chiing.
94 NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 + 2 - THANG 2/2019
4. K H LUAN
Tat ca 8 loai thudc dua vao thu nghiem deu cd kha nang lie che nam Phytophthora nicotianae VN 722 va nam Phytophtiiora heveaeYN739; ed 6/8 loai lie ehd nam Pythium sp. VN 602; ed 7/8 loai lic che nam Phytopythium sp. VN604 va nam Phytopythium sp VN596.
Ba loai hoat chat ed kha nang lic che nam rat manh vdi ca 5 chung nam gay benh la Potassium phosphonate 400g/l (Agrifos 400), Metalaxyl M40 g/1 + mancozeb 640 g/1 (Ridomid Gold 68WG) va Mancozeb 640 g / k g + metalaxyl M40 g/kg (Lanomyl 680WP). Hoat chat Difenoconazole 150 g/1 + propiconazole 150 g/1 (Tdt super 300EC) ed kha nang lic che rat manh vdi Phytophthora nicotianae VN 722 va Phytophthora heveaeYN739 nhung ehi lie che manh vdi chung Phytopythium sp.VN604, Phytopythium sp. VN596 va chung Pythium sp.
VN602.
Hoat chat Cytosinpeptidemyein 4% (Sat 4SL) lie che manh vdi chung Phytophthora nicotianae VN 722, lie che yeu vdi chung Phytophthora heveae VN739 nhung khong cd kha nang lie che cac chiing thuoc 2 chi Phytopythium va Pythium.
Nam ddi khang Trichoderma viride 1% (Biobus l.OOWP) lie che manh vdi chung Phytopythium sp.
VN604, trung binh vdi Phytopythium sp. VN596, yeu ddi vdi Phytophthora nicotianae VN 722, Phytophthora heveae VN739 va khong cd kha nang lie che chung Pythium sp. VN 602.
TAI UEU THAM KHAO
1. Chee, K H., (1985). Microorganisms Associated with Rubber (Hevea brasihensis Muell.
Arg.) Rubb. Res. Ins. Malaysia.
2. Cohen, Y. and Coffey, M. D. (1986). Systemic fungicides and the control of Oomycetes. Annual Review of Phytopathology, 24, 311 - 338.
3. Dam Van Toan, Dang Nhu Quynh, Nguyen Minh Chi, Thomas Jung, Mariha Horta Jung, Ana Perez-Sierra, Helen Rees and Pham Quang Thu (2017). Biological characteristics of Pythiaceae species isolated from soil of Hevea brasiliensis plantations in the South of Vietnam. 8th meeting lUFRO Workmg party 7.02.09 Phytophthora in
Forests and Natural Ecosystems in Vietiiam (Sapa, Vietnam).
4. Duong, N., Thanh, H. V., Doan, T , Yen, N., Tam, T. T. M.. Dung-Phan, T , Phuong, L. T. T, Duong, N. H., Thanh, H. N., Yen, N. T. and Dung, P.
T. (1998). Diseases and pests of Hevea Brasiliensis in Vietnam. In: Symposium on Natural Rubber (Hevea Brasiliensis), 2, 80-91.
5. Erwin, D. C. and Ribeiro, 0 . K., (1996).
Phytophthora diseases worldwide. APS Press, St.
Paul. Felsenstein, J., 1993. PHYLIP: phylogeny inference package. Version3.5c.Department of Genetics, University of Washington, Seattle.
6. Jayasinghe, C. K and Jayaratne, A. H. R.
(1996). Phytophthora epidemic possibility of management using resistant clone. Journal of Natural Rubber Research Institute of Sri Lanka, 77, 66-67.
7. Jacob, C. K., Edathil, T. T and Idieula, S. P.
(1995). Management of black stripe disease of Hevea. Indian Journal of Natural Rubber Research, 8, 21-24.
8. Jayasinghe, C. K. and Jayaratne, A. H. R.
(1996). Phytophthora epidemic possibihty of management using resistant clone. Journal of Natural Rubber Research Institute of Sri Lanka, 77, 66-67.
9. Jayatissa, H. G., Liyanage, N. I. S. and Wijesundera, R. L. C. (1994). Fungicides in the control of Phytophthora diseases of rubber in Sn Lanka. Journal of the National Science Council of Sn Lanka, 22,7-13.
10. Kamoun, S., Furzer, 0., Jones, J. D. G., Judelson, H. S., Ah, G. S., Daho, R. J. D., Roy, S. G., Schena, L., Zambounis, A., Panabieres, F , Cahill, D., Ruocco, M., Figueiredo, A , Chen, X. R., Hulvey, J., Stam, R., Lamour, K, Gijzen, M., Tyler, B. M., Grunwald, N. J., Mukhtar, M. S., Tome, D. F. A., Tor, M., Van Den Ackerveken, G., Mcdowell, J., Daayf, F , Fry, W. E., Lindqvist-Kreuze, H., Meijer, H. J. G., Peti-e, B., Ristaino, J., Yoshida, K., Birch, P. R. J. and Covers, F. (2015). The top 10 oomycete pathogens in molecular plant pathology. Molecular plant pathology 16:413-434.
11. Liyanage, K. K, Khan, S., Brooks, S., Mortimer, P. E., Karunarathna, S. K., Xu, J. and
KHOA HOC CONG NGHE
Hyde, K. D. (2017). Taxonomic revision and 13. Phan Thanh Dung, Nguydn Anh Nghia, phylogenetic analyses of rubber powdery mildew Trln Anh Pha, Nguydn Don Hieu (2014). Tai hdu t|.p hmgi Microbial Pathogenesis 105:185-195. huan ky thuat bao ve thuc vat cay eao su. Vien
12. Nguydn Anh Nghia (2016). Phdng tn bdnh Nghien ciiu Cao su Viet Nam, 120 ti-ang.
tren cao su: Benh rung la miia mua. 14. Tan, A. M. (1983). A new hingicide for the http://tapehicaosu.vn ngay 05/08/2016. conb-ol of black sttipe. Planter's Bulletin of Rubber
Research Institute Malaysia, No. 174,13-16.
STUDY ON EFFECT OF SOME KINDS OF PESTICIDES TO Phytophtboi^ LEAF FALL DISEASE OF RUBBER TREE (iferea&aaiiens/s) IN SOUTH EAST VIETNAM
Dam Van Toan, Pham Quang Thu Summary
In the Southeast, rubber tree (Hevea brasihensis) is an industria] tree leading economic value. As with many other plant species, the tree is suffering from a vanety of diseases, including Pbytophthora leaf fall disease, which is identified as major disease, causes significant damage to rubber trees. Study on the ability to inhibit fungal pathogens as a basis for effective disease management research. There are 3 kinds of pesticides including Agrifos 400, Ridomid Gold 68WG and Lanomyl 680WP that can very strongly inhibit 5 fungal strains of pathogens (Phytophthora heveae VN739, Phytophthora nicotianae VN722, Pythium sp.
VN602, Phytopythium sp. VN596 and Phytopythium sp. VN604). Tih super 300EC has very sUong inhibitory abihty with Phytophthora nicotianae VN 722 and Phytophthora heveae VN739 but only strong^
inhibits with Phytopythium sp.VN604, Phytopythium sp. VN596 and Pythium sp. VN602- Biopesticides such as Sat 4S1 and Biobus 1.00 WP showed only strongly inhibits to Phytophthora mcodanae VN 722 and Phytopythium sp. VN604 strains respectively.
Kfiywords: Rubber, Phytophthora, Pythium, Phytopythium, pesQcides.
Ngudi phan bi^n: TS. Ha Minh Thanh NgAy nhan bai: 28/11/2018 NgAy thong qua phan bidn: 28/12/2018 Ngdy duy^t dang: 7/01/2019
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 + 2 - THANG 2/2019
