KHOA HOC C 6 N G N G H E
/ AIMH H U D I M G GlIlA PHUIXI T H U O C B A D V E THLTC V A T O E PHOIXIG T R t r S A U H A I OEIV QUAIV T H E COIXI TRIJIVG V A
T H I EIM 0 ! C H TREIM C O C A U L U A 3 V U
Nguyin Vinh PhiicS Nguyin Tin Hiiu^ Tran Ldc Thuy^ vd Ngd Luc Cudng^
T6MTAT
Diln biln quan the dich hai va thien dich trdn dat liia co cdu 3 vu tai huyen TTiol Lai, thanh phd Cdn Tho nam 2013, dugc ghi nhSn tir kit qua phan tich cac chi sd da dang smh hpc cua con triing cho thay da dang loai dvu xuan he 2013 co thanh phan loai cao nhat (71 Ioai), thap nhat 6 vu dong xuan (64 loai). Vu thu ddng 2013 co chi sd da dang sinh hoc ciia con triing cao nhat (3,05), ke tiep la vu dong xuan (2,96) va thap nhatdvu xuan he (1,82). Chi sd mi thi loai cao nhdt 6 vu dong xuan 2012-2013 (0,19) va co khuynh hirdng giam dan theo hudng cac vu nip theo thdp nhat vu thu dong 2013 (0,13). Dilu nay cho thdy muc da phong phli loai cflng cd khuynh huong tich Ifly cho cac vu ke tiep. Bien phap phong trir sau hai bang thudc hoa hpc da lam giam chi sd da dang sinh hoc cua con tning. Do la mat trong nhOng nguyen nhan quan trong nhdt din din su kem dn dinh va ben vung cua biSn phap phong trir bdng thudc hoa hoc. Phat tnen nong nghigp bin viing hi&n nay la bao ve, duy tri va nSng cao tinh da dang sinh hpc.
Tir khda: Chi so da dang sinh hoc, uu the loai, tinh da dang loai, cacauliiaSvu, thud'e hoa hoc.
1.MTVANBE
Hidn nay, sdn xuat liia d- ddng bang sdng Cuu Long ff)BSCL) Iidn tuc trdn co cdu 3 vu Itia sd la eau ndi, gia tang dp luc cdc lodi sau benh trdn cay ilia.
Thudc hda hpc cd hidu qua vd hidu lue eao ddi vdi ede lodi sau b | n h gay hai; nhilu loai thude cd phd tac dung rpng didt nhilu lodi cdn triing ke cd nhung lodi thidn dich cd lgi. Voi bat ky cdn trung ed hai nao, thi cung hi vdi lodi an thit, loai ky sinh, hay Id thidn dieh ciia chiing vd giir mdt vai trd quan trong trong vide kilm sodt cdc loai ed hai dd. Chting cd kha nang tu kilm sodt ldn nhau vd ca cdc quan the cd hai (Nguyen VSn Huynh, 2012). Da dang lodi ludn la yeu td quylt dinh tinh dn dinh ciia eae he smh thai ttr nhidn. Bdi vi nd dam bao cho khdng chl smh hgc vd can bdng sd lupng cd t h i giira ede loai dugc thilt lap trong eae hd sinh thdi. Vi vay, viee kiem soat bdng thudc hda hpe tham ehi ed the ddn din sir biing phdt mOt loai dich hai ndo dd. Tir co so- dd d l tai nghidn cthi "Anh huong cua phun thud'e bao ve thuc vat de phdng tru sau hai dSn quan the con trimg va thien dich trdn co ciu Iiia 3vu tai Can Thd dupc thuc hien Id van de cdn thilt nhdm ldm co sd" khoa hpc trong nghidn cim cac bidn phdp phdng tru rdy nau hai Itia theo hudng sinh hpe bin virng.
2. VAT Uai VA PHUDNG PHV NGMBU CUU
2.1. Vdt hdu
- Gidng Ilia: IR 50404, OM 5451 va OM 2395.
- Phan bdn: Dam, lan, kah.
- Vpt, may htit mdu, hu nhua.
2.2. Phuong phdp nghidn ciiu
- Dta dilm va thdi gian thi nghipm: Huydn Thdi Lai - TP. Cdn Tho; vii ddng xuan 2012-2013, he tiiu 2013, tiiu ddng 2013.
- Thi nghidm dupc bd tri theo khdi hodn todn ngdu nhien. Mdi nghiem thue 100 m^.
- Mat dp sa: sa hang 100 kg/ha.
- Phan bdn theo Heu Itrong khuyin eao cho timg vu.
Nghiem thtic: Cd 6 nghidm thtrc:
Nghi§m thiic
ri
12
n
r4
rs re
r e n gidng [R 50404 OM5451 OM 2395 [R 50404 OM5451 OM 2396
Bign p M p xii ly
ITiuoc )i6a lipc (Prevathon 35WG, 40
»a 60 NSS)
rhudc hoa hoc (Prevathon 35WG. 40 ra 60 NSS)
rhudc hda hgc (Prevathon 35WG, 4C va 60 NSS)
rhudc sinh hoc (Abamectin, 40 va 6C NSS)
rhudc sinh hpc (Abamectin. 40 va 60 NSS)
rhudc sinh hoc (Abamectin. 40 va 60 NSS)
Trung tam Thdng tin Nong nghi?p Nong thon VTnh Long ' Vi?n Lua DBSCL
* Chi tidu theo ddi
- Qudn thi cdn tning gay hai va thien dieh:
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 10/2014
KHOA HOC CONG NGhf + Thu mdu bang may hiit D-Vac: Mdu cdn trimg
thu thap bang may hiit cdn trung, thimg chup cd dudng kinh 40 cm, thu thap 3 mdu ngdu nhidn trdn mdi nghidm tinic trong 3 giai doan sinh trudng chmh ciia eay liia la giai doan de nhanh (30 NSS), lam ddng (50 NSS) va chin sdp (70 NSS). Tat ea cdn hning vd thidn dieh trdn cay liia vd trdn m$t nudc hiit dugc sd trii trong phdng thi nghidm.
+ Thu mdu bang vpt: 1 mdu/d thi nghidm se dupc thu thap bd sung bdng each 10 vgt hen ttie trdn lidn di chuyin trdn mdi d thi nghiem.
- Mdu cdn trimg sau khi thu thap duoc dua vl phdng Lab Bg mdn BVTV, Vidn Liia DBSCL de phan tich, do dim sd lugng cdc lodi cdn triing, phan loai va dinh danh (su dung tdi hdu hd trp dinh danh con triing ti-dn liia nhu IPM CD-Rom (IRRI) (Borror and Delong's Introduction to the study of insects, Biology and management of rice insects).
• Sd hdu thu thap dupc xu ly qua bang hilu, dd thi bilu diln sd lugng vd biln dgng sd lupng. Cdc sd lieu dupe xu ly bang phdn mem Microsoft office excel 2007 vd phdm mIm JMP 9.
- Cdng tiitie tinh todn cac chi sd da dang sinh hoe:
• Chi sd Shannon - Weiner, 1949 (chi sd da dang Shannon). Tinh da dang loai h'ong mdt quan xa: (Pham Bmh Quyln, 2005).
H' = • £ (^^^iPi) hayH'= J
i=ip, /=i
i7'°«^¥
Trong dd:
5: sd lugng loai;
p,= nj/N : ty l l cd till eua lodi i so vdi sd lucmg ed t h i toan bp mdu.
N: tdng sd ca t h i trong toan bd mdu.
n,: sd lupng ca t h i lodi /
• Chi sd tm t h i loai (Dominance):
C- 2_ ( ; ^ * (Pham Binh Quyen, 2005) Trong dd:
C: chi sd eiia lodi uu the.
N: tdng sd cd thi.
ni: sd ca t h i cua lodi thti i.
3. KET QUA VA THAO LUAN
3.1. Biln ddng v l sd lodi va mdt sd cdn tning 3.11 Vu dong xu^ 2012-2013
Bang 1: Sd lugng lodi vd cd t h i cdn triing trdn cdc nghidm thuc phdng trir sau hai qua cdc thdi dilm dilu tra vu ddng xuan 2012-2013
Nghiem thiic
IR 50404-hoa hoc IR 50404-sinh hgc OM 5451-hoa hpc OM 5451- sinh hgc OM239Sh6ahgc OM 2395- sinh hoc CV(%)
S61oai 30 NSS
13,67 12,67 14,00 11,67 11,00 12,00 25,90
50 NSS 9,33 9,33 7,67 9.67 8.00 9,67 23,60
70 NSS 9,00 9,67 9,67 10,67 11,67 9.67 26,80
S^cafhl/m^
30 NSS 230,89 258,76 183,12 318,47 165,87 205,68 26,50
50 NSS 248,14 363,59 157,91 228,24 127.39 207,01 58,30
70 NSS 192,41 179,14 140,66 188,43 188,43 139,33 31,20 Kit qua phan tich d- bang 1 cho thay mat sd cdn
tning thudng eao d giai doan dau va giua vti, sau dd giam b giai doan liia trd chin. Tuy nhidn, khdng cd sir khdc bidt qua cac giai doan dilu tra b edc nghidm thuc phdng trir sau hai trdn eae gidng liia. Nhung trong Cling mdt gidng thudng nghidm thtic xu ly thudc sinh hgc cd mat sd cdn triing eao hon so vdi xir ly thudc hda hgc. Giai doan Iiia de nhanh ed so loai
con trimg dugc ghi nhan kha cao (bang 1), sau do giam dan. Vide phun thuoc hda hgc da anh hudng den sd lupng lodi va mat sd edn trimg ndn sd luong lodi va ca the thu dugc tren eae nghidm thuc phun thudc hda hpc thap hon so vdi phun tiiude sinh hgc Diing thudc hda hpc deu lam giam dang k l sd lupng cdn trimg an mdi va mdt sd lodi thidn dich quan ti-gng khdc tren rupng liia (Ld Trung Dung, 2011).
12 NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 10/20H
KHOA HOC C O N G N G H I
Vide tang cudng cac c h l pham sinh hpc, than thidn voi mdi tniong vd lgi dting can bdng tu nhidn cua qudn t h i thidn dich, han c h l phun thude tru sau pho rOng trong giai doan liia de nhdnh, d l quan I^ khdng d l gia tang mat sd cdn trimg gay hai cd vai trd rat quan trpng (Nguydn Huu Huan, 2012).
Sd lugng lodi va ea t h i cdn trimg thudc 3 nhdm chiic nang chinh trong vu ddng xuan h-dn ea cau 3 vu Ilia dupc ghi nhan khd eao trdn gidng IR 50404 so vdi
hai giong OM 5451 vd OM 2395. Khdng cd su khac bidt nhau nhieu v l sd lodi thudc cac nhdm chiic nang, vd thdng thudng trong cimg mdt gidng tiii sd lupng cdn trimg gay hai vd thidn dich an mdi b nghiem thiic xii ly thudc sinh hgc cao hon so vdi xir ly thudc hda hgc. Nhdm ky sinh cd sd lupng lodi va cd the thap nhat 6 tat ca cac nghidm thiic xii ly thude ( h m h l ) .
a
• s 5 loai gay hai• s o loai an moi DSO loai ky sinh
IR5MM R5O104 OM5451 OM5451 OM2395 OM2395
(hiahpc) (slnhhx) (hoa hoc) (sinh hoc) pioahoc) (sinh hoc)
n
lsocalhegay[^i•s6catheann)6i Dsdcathekysmh
IR504M IR5MM OM545I OM5451 OM2395 0M2395 (hoa hoc) (SH^ hoc) (hoa hoc) [sinh hoc) (hoa hgc) (smh hoc)
a) b) Hinh 1: a) S6 ItHTDg loM c6n trung thuOc nh6m chijrc nang a cac nghidm thiic (huy^n Th6i Lai, Tp. C ^ Thff, vy ddng xuan 2012-2013. b) S6 c^ th^ c6n tiimg thuOc nh6m chiic nSng b cac nghidm thiic ( huy^n
ThiSi lai, Tp. Cin Tho, vu d6ng xuan 2012-2013) 3.1.2. Vu xuin hi 2013
Being 2: S6 lupng locli v^ cA th^ con tnmg trdn cac nghidm thiic ph6ng tru sdu hai qua c ^ thdi d i ^ di^u tia lai huyfai Th6i Lai, Tp. Cin Tha, vu xuan h t 2013
Nghidm thiic
IR 50404-hoa hoc IR 50404-sinh hgc OM 5451-hoa hpc OM 5451- sinh hoc OM 2395-hoa hpc OM 2395- sinh hpc
CV(%)
S^loM 30 NSS
8,7 10,0 9,0 9,3 10,0 9,7 18,8
50 NSS ,3 11,0 11,3 7,3 11,0 10,0 23,8
70 NSS 12,7 10,3 9,7 12,7 12,0 10,3 29,8
S « c 4 t h « / m ' 30 NSS
136,0 158,7 164,0 219,7 134,7 106,7 29,1
50 NSS 298,0 366,0 322,0 303,0 403,7 406,7 36,5
70 NSS 117,3 117,3 114,7 161,3 185,3 162,3 40,7 Khic v « vu dong xuan, bi^n dong v4 sd loai va « " '^ K**"* <:ho thay Idiong co bien dong nhiiu v4 mat s6 can trung tr6n cac n g h i t a flnic tang cao vao 1*™« ™ ^'^ ^^"^ • " « "^^ 1"^ "<: «'=" <'<"" ''i*"
giOa vu * giai doan de nhanh va lam dong. Tuy nhien "=>. Trong cung mpt giong thuomg nghiem thiic xir ly s6 Ioai va c i thi CT cac nghidm thiic phong trir sau hai
N 6 N G NGHIEP V A PHAT TRIEN N O N G THON - KY 1 - THANG 10/2014 13
iCHOA HOC C 6 N G N G H E
thude smh hpc cd mat sd edn triing eao hon so vdi nghiem thiie xu ly thudc hda hgc.
Sd loai thu thap dupe qua 3 giai doan dilu ti-a trdn cdc nghidm thiie khdng eo su khac bidt nhau vd biln ddng tu 8 din 12 loai. Mat sd cdn tning dupc ghi nhan khd cao b giai doan ldm ddng bien ddng tir 298,0 den 406,7 ea thl/m^. Trong dd hai nghiem thiic ciia gidng OM 2395 xu Iy thude hda hpc vd thudc sinh hpc diu cd sd loai vd ed t h i cao hon so vdi cdc nghidm thiic khac mSc dii khdng ed su khae bidt ed y nghia giua ede nghiem thiic (bang 2).
Kit qua d" hinh 2 cho thdy sd lodi vd cd t h i edn trung thudc 3 nhom chiic nang chinh trong thi nghiem vu xuan he 2013 biln ddng khong ldn giiia cac nghidm thiic thi nghidm (hinh 2). Sd lugng loai gSy hai hidn dien tuong ddi thdp trong vu xuan hd, giiia cac nghidm thiic bien ddng tir 3,7 din 6,3 loai;
trong khi do sd loai vd ca t h i thudc nhom f!i:A^n dich an mdi giiia cdc nghiem thiic kha doi dao (biln ddng tiJC 19,7 d i n 22,3 lodi va bi 411 d i n 569 ca till), ti-ong dd nghidm thiic OM 5451- phun thudc sinh hge cd s^
loai thap nhat (19,7 lodi) vd cao nhat o- 2 nghiem thiic OM 5451- phun tiiude hda hpc va OM 2395- phun thudc hda hpc (22,3 lodi). Sd lupng loai ky sinh tuong ddi t h ^ chi 1,7 - 3,0 lodi. Sd lupng cdn trung trdn cac nhom gay hai va an moi cung cho thay gidng CM 2395 cd sd lupng lodi gay hai cao, k l din !a gidng OM 5451 va it nhat trdn gidng IR 50404. Trong ciing mpt gidng thi gidng dugc phun thudc sinh hpe eo so lupng cdn trimg gay hai va an mdi cao hon trdn gidng cd phun thudc hda hpc (gidng OM 2395 thi ngupc lai). Dieu ndy cho thdy vide phun thudc hda hgc da lam gidm ddng k l sd loai eiing nhu sd lupng cdn trimg trdn ddng rupng.
250
1
ll J 1 1
1
I 1
i s ^ loai gay hai isoloaianfnoi Ds6 loai ky sinh
RSOm IRSMM on M i l O H M OII238S O M 9 5 fioate) (siohtel ( f t t e ) (siokte) (hoate| (siohte)
_,
isocaHiigayhai 1 so ca Ihe an ma osdcalhekysiiti
R 50404 IR 50404 OM 5451 OM 5451 OM 2395 OM 2395 (hoa hoc) (sinh (hoa hoc) (sinti (tioahoc) (sinh
hpc] hoc) hoc)
a) b) Hinh 2: a) S6 lupng lodi edn trimg thupc nhdm chiic nang b cdc nghidm thiic (huydn Hidi Lai, Tp. Cdn Tha, vu xuan hd 2013. b) Sd cd till edn trung tiiude nhdm chiic nang b cdc nghidm thiic ( h u y i n Thdi Lai. Tp. Cdn
Tlia.vu xuan hd 2013) 3.L3 Vu diu dong 2013
Kit qua d bang 3 cho thdy khdng cd su khac bidt giiia edc nghidm thiic v l sd lupng loai va ca t h i edn trung trong vu thu ddng 2013. Sd lupng loai va ca the edn trimg thu dupc trdn cac nghiem thiic thi nghidm trong vu thu ddng tuong doi thap. VI biln ddng edn
trimg cho thay ciing tuong tu nhu vu xuan he. Sd loai vd ea the thap b giai doan dau va tang cao vdo giiia va cudi vu. Dilu nay cd t h i do vdo giai doan ndy tat ca cac rupng chung quanh thude ca edu 2 vu liia diu dang cr giai doan trd vd chin ndn cdn triing tap hung nhilu vao giira va eudi vu thu dong (bang 3).
N O N G NGHIEP VA PHAT TRIEN N O N G THON - KY 1 - THANG 10/2014
KHOA HOC C O N G H G H i
Bdng 3: S6 hipng l o ^ vd cA th6 cdn tlung tr&n cdc ngfalgm thiic phun thuoc trii sdu hai qua cdc thdi £ & n d i ^ tra vutfau ddng 2013.
N g f a i ^ thiic
IR 50404-hoa hoc IR 50404-sinh hoc OlVl 5451-hoa hoc OM 5451-sinh hpc OM 2395-hoa hpc OM 2395- sinh hpc CV(%)
Sdlodi 30 NSS
9,7 7,3 7,7 7,3 10,3 9,3 20,5
50 NSS 14,3 13,3 14,3 13,3 12,3 11,7 52,7
70 NSS 10,3
8,0 10,7 10,7 9,0 12,0 22,5
S6cd(h^/m=
30 NSS 116,0
85,3 82,7 84,0 62,7 78,7 56,1
50 NSS 192,0 149,3 232,0 210,7 166,7 145,3 31,8
70 NSS 213,3 190,7 157,3 188,0 106,7 189,3 38,4 S6 luong loai va ca the con trimg cua cac nhom ^o Mu Men then tiet khi hau Vll thu dong 2013 mua chiic nang tuong S6i thap h e n tit ca cac nghiem thiic ^^ "hita nen khong thich hpp cho su phat hien cua thi nghiem trong vu thu dong 2013. Difa nay co the '^^'^ ' " ^ • : " ^^^ t^™ ™«"S '"^ C™*" 3).
R50W R S m OMSUI 0MS151 0^2395 CM2395 (hoahgc) (silihK) (Uahgc) (si^hgc) (Inihgc) (snlihpc)
•
\i\ 1 1 i l Bn Bl 11
• sfc^th^gayhiii
Qs&calhekyslrh
IR50404 I R 5 0 W 0 M H 5 1 OH5451 OH2395 OM2395 (hoa hoc) [smh hpc) (hoa hoc) [smh hpc} [hoah^c) (smh hpc)
a) b) Hmh 3; a) S6 lupng lodi cdn tning tiiupc nhdm chiic nang 6 cdc nghidm thiic (huydn Thdi Lai, Tp. Cdn Tha,
vu thu ddng 2013. b) Sd cd t h i c6n tiling thupc nhdm chiic nang b ede nghidm tinic (huydn Tlidi Lai, Tp.
Cdn Ilia, vu tiiu ddng 2013) 3.2. Anh huong cua bi^n phdp phim thudc
BVTV din ede chi sd da dang sinh hpe ciia cdn trimg trin ca cdu 3 vu liia
Kit qua phan tieh cdc chi sd da dang sinh hpe ciia cdn triing trdn ca cau liia 3 vu cho thay: ty Id sd lupng cd t h i thu dupc a vu dong xuan ca edu 3 vu dat cao nhdt, chilm 38,97% (4660 ea till) so vdi tdng sd lupng ca t h i thu dupc, vu xuan he chilm 34,35%
(4107 cd till), vu tfiu ddng chilm 26,68% (3190 cd
the). Thanh phan loai ghi nhan tren vu xuan he 2013 CO dp phong phli va loai la cao nhdt (71 loai), k l din la vu thu ddng 2013 dat 69 loai, vu ddng xuan 2012- 2013 la 64 loai. Kit qua nghidn ciiu eho thdy thanh phan loai cdn trung trdn rupng liia giam eung phii hpp vdi kit qua trudc day cua Nguydn Hiiu Huan (2008). Kit qua nay cung phii hop vdi nhan xet eiia La Pham Lan va etv. (1995) la ed ddu hidu suy gidm dang ke da dang loai ciia tap hop sau hai vd thidn dich trong sinh qudn cay liia do sir dung thude trir
N 6 N G NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 10/2014 15
KHOA HQC C d N G N G H t
sau hda hpc theo tap qudn nong dan. Cac loai cdn trimg thien dich vd nhdn ddng vai trd quan trpng trong vide dieu hda mat sd sau hai da dupc nhieu tac gia ghi nhan (Luong Mmh Chau, 1993; Vii Quang Cdn va etv, 1993).
Chi sd uu t h i loai eao nhat b vu ddng xuan 2012- 2013 la 0,19, vu xuan he 2013 la 0,18 va tiiap nhat b vu tiiu ddng 2013 la 0,13. Chi sd uu t h i loai cd khuynh hudng giam dan theo hudng cac vu tiep theo. Dieu nay cho tiiay miie dd phong phii lodi cung ed khuynh hudng tich luy cho cac vu k l tiep (hinh 4).
Kit qua phan tich cae chi sd da dang Shannon- Werner index (HO h-ong vu thu dong 2013 (3,05) eao han so vdi vu ddng xuan 2012-2013 (2,96). Trong khi do chi sd da dang giam manh d-xuan he (2,82). Dieu nay cho thay rdng trong vu xuan he thdi tilt tiiich
hpp cho cac loai cdn trimg phat trien va k i t hpp voi vide phun thude t n i sau lam giam mat sd ky sinh thidn dich va lam tang nhanh mat sd sau hai dae biet la ray ndu (Setfle, W. H. et al., 1996), phun dinh k^
lam thiet hai ngudn tinic an cua thidn dich, ddng thdi lam giam tinh phong phii va da dang cua mdi trudng, tao ra t h i trdi cua mdt vai lodi dac biet (La Pham Lan etv, 1995).
Han che su dung cdc bien phap ky thuat canh tdc lam phd va can bdng smh thai nhir su dung thudc trir sau pho rdng, phan dam, mat dp sa cao, giam phun thudc trir sau sdm va sd ldn phun khdng can thilt de khdng anh huang den phdng tru smh hoc tu nhien (Heong, 1991). Tang cudng cac c h l pham sinh hpc, than thien vai mdi trudng va lpi dung can bdng tu nhien ciia quan t h i thidn dich (Nguydn Hiiu Huan, 2012) trong phdng tru ray nau.
Shanno ri-Warer uriex
3 05
• w
; « « • ;
0,18 0.16 014 012 01 0 08 0.06 0.04 0.02 0
0X XH TB
Hinh 4: Anh hudng cua hien phap phun thudc trtt dich hai d i n chi sd da dang (a) (Shannon-Weiner indrat) vd chi sd uu till loai (Dominance) (b) cua cdn trimg qua cac vu liia, tai huydn Tlidi Lai, Tp. Cdn TTia.
4 . KETLUAN
Bien phap phdng trir sau hai bdng thudc hda hpc da anh hudng din thanh phdn, sd lupng loai va ca the cdn tning. Sir dung c h l pham sinh hoc, than thien vdl moi truong lam can bang tu nhien cua qudn the cdn trimg, thien dich. Cac chi sd da dang sinh hpc cua cdn trimg ghi nhan thdnh phan loai tren vu xuan he la cao nhdt (71 loai), thap nhat vu ddng xuan (64 loai). Chi sd uu thd loai cao a v u dong xuan (0,19) va
cd khuynh hudng giam dan theo huong cdc vu tiep tiieo (thu dong: 0,13). Chl sd da dang Shannon (HO cao d- vu thu ddng 2013 (3,05) vd giam manh a xuan he (2,82).
TAI UEU THAM KHAO
1. Le Trung Dung, 2011. Nghien eiiu dac dilm hinh thai, smh hpc, kha nang an mdi va anh huong thuoc Pymetrozine den bo eanh cut Paedenis Oiscipes Curtis (Staphynilliadae - Coleoptera). Luan
16 NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 10/20U
KHOA HOC CdNG NGHl
van thac sy khoa hpc ndng nghiep, 201L Truang DHNLTp. HCM.
2. Luong Minh Chau, 1987. Nghidn ciiu mdt sd bidn phdp trong quy trinh ^ n g hop phong trir ray nau hai liia tai dong bdng song Ciiu Long.
3. Luong Mmh Chau, 1993. Nghidn ciiu va iing dung chuong trinh phdng tru tdng hpp sau bdnh hai Ilia tai ddng bdng sdng Cuu Long. Bdo edo tham gia hpi nghi IPM ngdy 11/3/1993 tai Vien Liia DBSCL.
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INFLUENCE OF CHEMICAL CONTROL MEASURES ON ARTHROPOD DIVERSnY IN TRIPLE -CROPPED IRRIGATED RICE SYSTEM
Nguyen Vinh Phuc, Nguyen Thi Huu, Tran Loc Thuy and Ngo Luc Cuong Summary
Tlie population dynamics of insect pests and natural enemies and on tnple cropping pattern of nee m Thoi Lai district. Can Tho city were recorded from analysis of indicators of arthropod diversity showed that the 2013 spring - summer crop season consist of the highest species with 71 species and the lowest were 64 species in the 2012-2013 winter - spring crop season. While the Shannon Weiner index were the highest (3.05) in the autumn crop, that of winter - spring crop were 2.96 and the 2013 spnng - summer crop were the lowest (1.82). The dominant species index hold the highest in wmter - spnng crop (0.19) and they tend to decrease towards the next crop, the lowest were autumn crop (0.13). This dominant was likely to decrease the level of species richness also tended to accumulate for the next crop. Pest control measures by chemical pesticides has reduced insect biodiversity. It is one of the most important causes leading to the less stable and sustainable control measures for chemicals. Sustamable agncultural development is now manipulating for protecting, mamtaining and enhancing biodiversity.
Keywords: Arthropod diversity, species ncbness, dominance. Shannon, triple-cropped irrigated rice system.
Ngudi phdn bi|n: GS.TS. Pham Van Lam Ngdy nhdn bdi: 07/4/2014
Ngdy tiiong qua phdn bi|n: 07/5/2014 Ngdy duyit dang: 14/5/2014
N 6 N G NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 10/2014
