' • ^
REP SAP HAI CAY AN QUA VA M Q T SO CAY CANH ci VUNG HA NOI VA PHU CAN*
Vii Quang Con, Dang Thi Dap, Truong Xuan Lam, Nguyen Thi Phuong Lien - ,- Vien Sinh thdi vd Tdi nguyen sinh vgt
DAT VAN DE
Rep sap (Homoptera: Coccoidea) la nhdm sau hai nguy hiem cho nhilu loai cay tr6ng, dac biet la nhirng cay trong lau nam nhu cam, quyt, che, ca phe, cay canh,... Rep CO kich thudc nhd be, thudng co sap hoac vay bao ve, cd siic sinh san rat cao nen kha nang tich luy sd lugng nhanh, do dd kha nang gay hai cua chiing rat ldn. Viec phong trir chiing la rat khd khan hoac kh6ng ed hieu qua.
C5 Viet Nam, van de nghien ciiu khu he rep sap it dugc cac nha khoa hpc de cap den. Nguyen Viet Timg va rmk. (1977) da cdng bd thanh phan rep sap tren cam quyt d mien Bac Viet Nam. T6ng s6 eo tdi 40 loai. Theo tai lieu t6ng quat ve khu he sap d Viet Nam do E.M. Danzig cong b6 nam 1990 da cho danh sach 98 loai rep sap thupc 7 hp dd la: - Magrarodidae, Pseudococcidae, Asterolecaniidae, Eriococcidae, Aclerdidae, Coccidae va Diaspididae hai tren cac cay trdng ma chu yeu la cac loai cay an qua nhu cam, quyt, ca phe, xoai, h6ng, cay canh,... (bang 2). Trong Tap chi Bao ve thuc vat s6 2 nam 1994, tac gia Pham Van Lam cd dua ra danh sach g6m 57 loai thupc 4 hp. Trong do CO da s6 cac loai trimg vdi danh sach ma Danzig (1990) da neu.
Vi viec nghien ciiu ve khu he rep sap d nude ta noi chung, tren cam, quyt va cay canh noi rieng la rat can thiet nen chiing t6i da tien hanh nghien ciiu chiing d vimg Ha Npi va phu can.
PHl/OfNG PHAP NGHIEN CUTJ
Tien hanh thu thap tat ca cac loai rep sap tren cam, quyt va cay canh tai cac diem ngoai thanh Ha Npi va phu can. Cd tien hanh dieu tra b6 sung vao nhirng thdi diem ma mat dp rep sap tang cao. Rep sap thu dugc mpt phan dugc tach rieng, ngam c6n 70 trong cac 6ng nghiem nhd va lam tieu ban. Phan con lai dugc cho vao 6ng nghiem, day niit b6ng, hang ngay nu6i va theo doi thanh phan ong ky sinh cua chiing.
Rieng loai rep sap tren cay van tue chiing t6i ti6n hanh theo doi nhu sau:
Theo doi dien bien mat do (con/cm^ la) theo cac ngay dieu tra va ty le ky sinh (%) ciia chiing.
Da dirpc dang trong Cdc cong trinh nghien ciru Moi trucmg, tap II; 1998; tr. 63.
+ Tiln hanh thir nghiem phun thu6c dugc pha che theo c6ng thiic (1 goi thu6c thao mpc ST3 pha vdi 10 lit nude + 1ml thudc Trebon 30EC -i- 2 thia ca phe xa phong) phun tren cay van tu6 vdi lieu lugng 3 lit thudc pha/1 cay. Tiln hanh dilu tra trudc khi phun va sau khi phun 1, 3, 5 va 7 ngay.
-1- Dieu tra dinh ky 7 ngay 1 lin tren 2 c6ng thiic theo ddi mat do (con/em la) ciia rep sap hai va ty le ky sinh (%) cua chiing.
S6 lieu tinh toan th6ng ke dugc thuc hien tai Phong Sinh thai e6n trimg - Vien Sinh thai va Tai nguyen sinh vat b§ng Excel tren Window.
KET QUA NGHIEN CUXJ
K8t qua nghien cuu v l rep sap va ong ky sinh ciia chung
Chiing toi da tiln hanh dilu tra d nhilu vudn cay cam, quyt, vudn cay canh thupc Ha Npi, Ha Tay, Ninh Binh. Kit qua dilu tra cho thky, da phat hien dugc 20 dang loai rep sap hai cay cam, quyt va cay canh, da giri mlu sang CHLB Nga de dinh loai tdi loai vi d Viet Nam khdng cd tai lieu, bao g6m 6 dang loai tren cam, quyt (Coccoidae:
5 dang; Diaspididae: 1 dang), 8 dang loai tren cac cay canh khac (tren cay luu, hoa ciic tring, cay bong nude, cay van tue, cay hoa quynh, cay hoa nhai Nhat, cay vang anh, cay hoa mau dan, ca 8 dang loai tren diu thupc Coccoidae), 3 dang loai khac thupc Pseudococcidae tren cay la do, cay vii siia, cay da va 3 dang loai nira thupc Diaspididae tren cay bang lang, cay si, cay sung.
Bing each nuoi va theo doi rep sap trong phong thi nghiem da thu dugc 7 dang loai ky sinh tren rep sap, dac biet la cac loai ky sinh tren rep sap hai cay van tue cd vai tro dang kl trong viec kim ham so lugng rep sap hai cay canh nay (bang 1), 7 loai ong ky sinh thu6c 2 hg Chalcidoidae va Encyrtidae da dugc thu thap tren rep hai cam, van tue, bang lang, cp canh, luu va cau lim.
Bang L Cac dang loai ky sinh cua rep sap hai cay an~qua va cay canh da phat hien tai diem nghien cuu
STT 1 2 3 4 5 6 7
Ten l<y sinh Ong den lu-ng vang Ong den nho Ong vang nho Ong den Ong den to Ong nau vang Ong den
Vgt chu Rpp sap mem tren cam Rpp sap tren vgn tue Rpp sap tren vgn tue Rpp sap mIm tren cp canh Rpp sap tren bang lang Rpp sap tren cay lyu
Rpp sap den vang trSng tren cay cau lun
Diem thu Ha Tay Ha Tay Ha Tay Ha Npi Ha Npi Ha Npi Ha Npi
Dien biln mat do ciia rep sap tren cay van tue va ty le hi ky sinh ciia no
Trong s6 cac loai rep sap thu thap dugc thi rep sap hai cay van tue ddng vai trd quan trpng nhit. Chiing co s6 lugng rat ldn va bam chi chit dudi mat la. Bang phuong phap chia 6 chuin (Icm^/la) chiing t6i da tien hanh budc dau nghien cim dien bien s6 lugng (con/cm^ la) va ty le ky sinh (%) cua loai rep sap nay (xem hinh 1).
25
20-- 15--
. c 55
^ 10- '^
5-
iTyl^ky sinh (%) . M^t d(l (con/arf)
-h
600
500
•400 ' g c
•300 •§.
<<D-Ci
•200 §•
'cn-
100
12/4 19/4 26/4 3/5 10/5 17/5 Ngay dieu tra
25/5 2/6
Hinh 1. Dien bien mat do vd ty le ky sinh ciia rep sdp hgi tren cdy vgn tue tgi Hd Ddng, Hd Tdy
Ket qua dieu tra tir thang 4 den thang 6/1997 cho thay, ngay 12/4 s6 lugng rep sap la 205,57 con/cm^ da tang nhanh va dat cue dai 478 con/1 cm^ (ngay 3/5), sau do giam dan vao cu6i thang 5 (47,85 con/cm^). Qua cac dgt dieu tra s6 lugng trung binh cua rep sap hai cay van tue la 219,98 ± 31,78 eon/cm^. Trong khi do ty le ong ky sinh tren rep sap thap nhit 4,34% (ngay 19/4) va dat cao nhat 18,7% (ngay 2/6). Ty le trung binh dat 11,34 ± 1,65%. Dieu do chiing to rang, ong ky sinh dong vai tro quan trpng trong viec kim ham s6 lugng rep sap hai cay van tue. Khi ty le ong ky sinh cao (ong cd mat tren vudn nhieu) thi mat dp rep sap giam.
Thir nghiem phun thuoc phong chong rep sap tren cay van tue
Trong thuc te, khi s6 lugng rep sap len cao thi van phai sir dung thu6c hda hpc kim ham s6 lugng ciia chiing. Nhung mat ban che khi sir dung thuoc boa hpc do la sir d nhiem m6i trudng s6ng xung quanh, anh hudng tdi siic khoe con ngudi, dac biet la ddi vdi cac cay canh, mpt trong nhirng loai cay gan ngudi nhat, chu yeu dugc trdng trong vudn trudc cira hay d trong nha. Chinh vi vay, tai vudn cay canh Ha D6ng, Ha Tay tren cay van tue chiing t6i da budc dau thir nghiem phun thulc thao mpc ST3 do Vien Sinh thai va Tai nguyen sinh vat san xuat co pha lan Trebon 30EC theo c6ng thiic sau: 1 goi ST3 (Ig) + 1ml thu6c Trebon + 2 thia ca phe xa phong -i- 10 lit nude. Thu6c dugc phun vdi lieu lugng 3 lit/1 cay bing binh bam tay (hinh 2).
Trade Sau Sau Sau khi 1 3 5 phun ngay ngay ngay
Thdi gian sau khi phun
Sau 7 ngay
CT-phun
• CT-ddi chiing
Hinh 2. Anh hudng ciia thudc ST3 co pha ldn Trebon 30EC len sd luong rep sdp hgi cdy vgn tue sau khi phun
Trudc khi phun thulc mat do rep sap d c6ng thiic phun thuoc la 285,17 con/cm^
va e6ng thiic d6i chiing la 255,57 con/cm^. Sau khi phun 1 ngay, mat do rep sap d c6ng thiic phun thulc giam xuong ro ret, con 73,87 con/cm^ va sau 3 ngay mat dp chi con 65,23 con/cm^. Trong khi dd d c6ng thiic d6i chiing mat dp rep sap tuong ling la 263,44 con/cm^ va 247,55 con/cm^. Sau 5 den 7 ngay mat dp rep sap d cdng thiic phun thuoc bit diu tang tir 105,25 con/cm^ din 120 con/cm^ va c6ng thiic d6i chiing tang tir 278,35 con/cm'^ tdi 295 con/cm^. Dieu do chimg to thudc nay da cd tac dung diet trir rep sap tren cay van tue va hieu qua cao nhat la tir 1 den 3 ngay sau khi phun.
De nghien ciiu anh hudng cua thudc nay den ty le ky sinh (%) cua rep sap tren cay van tue, chiing tdi van tien hanh dieu tra tren ca 2 c6ng thiic dinh ky 7 ngay 1 lan (hinh 3).
O-LB.
^Ty & ky sinh CJl 3Tyi$ky sinh CTII
••M^td$CTI
•mtddCTIl
12/4 19/4 26/4
Ngay dieu tra
17/5 25/5
CO
?5
-•450 550
• 350
250
150
50
50
Hinh 3. Ty le ky sinh vd mat do rep sdp cdy vgn tue o cdng thiec phun thudc
vd ddi chieng tgi Hd Ddng, Hd Tdy
So sanh thing ke qua gia tri trung binh vdi P < 0,05, N = 14 qua 2 c6ng thiic cho thay:
- D6i vdi mat dp rep sap thi T^ = 2,4 > Tn = 2,1), dieu dd ehiing td rang mat dp rep sap giiia c6ng thiic phun thu6c va c6ng thiic kh6ng phun thu6c sai khac co y nghia hay thuoc ST3 CO pha Trebon 30EC da lam giam dang ke so lugng cua rep sap tren cay van tue. -—
- Doi vdi ty le ky sinh thi thi Tn = 0,41 < Tu = 2,1, chiing td ring ty le ky smh (%>) giiia c6ng thiic phun thuoc va cong thiic doi chiing khong co su sai khac (sai khac khong cd y nghia) hay thuoc ST3 co pha Trebon 30EC da khdng lam thay doi ty le ky sinh {%) ciia rep sap hai cay van tue.
KET LUAN
Qua ket qua dieu tra va nghien ciiu tai mpt s6 dia diem d ngoai thanh Ha Npi va phu can, tren cay an qua cd miii va mpt s6 cay canh chiing t6i budc dau da thu dugc mpt so ket qua:
- Da thu thap dugc 20 loai rep sap hai cam, quyt va cay canh thupc cac hp Pseudococcidae, Margadoidae va Coccoidae. D6ng thdi da thu thap dugc 7 loai ky sinh ciia rep sap tren cac cay tr6ng dd thudc 2 hp Encyrtidae va Chalcidoidae.
- 0 cdng thiic phun thu6c mat dp rep sap va ty le ky sinh tuong ling la 219,98 + 31,78 con/cm^ va 11,34 + 1,65% trong khi do d c6ng thiic dii chiing la 131,94 + 17,41 con/cm^ va 10,44 + 1,44%.
- Thu6c ST3 cd pha them Trebon 30EC cd kha nang diet rep sap tren cay van tue vdi hieu qua cao.
- Thu6c thir nghiem kh6ng lam anh hudng tdi ty le ky sinh (%>) cua rep sap tren cay van tue.
Bang 2. Danh sach cac loai rep sap (Homoptera, Coccoidea) ma Danzig da phat hien dugc d Viet Nam (dimg de tham khao)
TT 1 2 3 4 5
6
Ten khoa hpc HQ MAGRARODIDAE - REP SAP Cryticerya jacobsoni (Green) Icerya aegyptiaca Douglas Icerya pulcher Leonard!
/cerya purc/ias/Maskell
Icerya seychelamm (Westwood) HQ PSEUDOCOCCIDAE - REP SAP GlA Antonia graminis Maskell
Cay chu
Cam, quyt, mit, chuoi va nhieu cay khac cam, quyt
Cam, quyt
Cam, keo, phu-png, xlem uc, tung, bach, thong Cam, bu'oi, phong lan va cay
an qua khac
Cay CO tren bai chan gia sue
Dia diem thu Ha Npi HN, HT, BL, TP. HCM
TP. HCM, TG, CB, HM, HN, HB
HN, HB HN, VP
SL
TT 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
Ten khoa hpc Cataenococcus sp.
Dysmicoccus brevipes (Cockerell) Dymicoccus neobrevipes Seardsley • Fcnisia virgata (Cockerell)
Nipaecoccus viridis (New/stead) Syn: N. vastator (Maskell)
Paramymococcus vietnamensis William Planococcus citri (RIsso)
Syn: Pseudococus citri (Risso) Pseudococcus citriculus Green
Psedococcus comstocki (Kuv\/ana)
Rastrococcus sp.
Rastrococcus sp.
Saccharicoccus sacchari (Cockerell) Xenococcus anandalei Silvestri HQ ASTEROLEECANIIDAE Psoraleococcus verrucosus Borchs.
Mallococcus sinensis (Maskell) HQ ERIOCOCCIDAE
Acanthococcus sp.
Aclerda takahashii Kuw/ana
HQ COCCOIDAE - REP SAP (mem) Ceroplastes ceriferus (Comstock) Cesroplaste rubens Maskell;
CenDplastodes chiton (Green) Chloropulvinaria aurantii (Cockerell) Syn: Pulvinaria aurantii (Cockerell) Chloropulvinaria cellulosa (Green) Syn: Pulvinaria cellulosa Green i Chloropulvinaria floccifera (Westwood) Chloropulvinaria polygonata (Green) Coccus hesperidum Linnaeus Coccus celatus De Lotto Coccus viridis Green
Eucalymnatus tesselatus (Signoret) Macropuivinaria maxima (Green) Platilecanium sp. (gan giong P.citri Takahashi)
Roropulvinaria mangiferae (Green) Protopulvinaria pyriformis (Cockerell) Saissetia coffeae (Walker)
Syn: S.hemisphaerica Targ. - Tozz.
Cay chu Chuoi
Mia, difa, ca phe, dira d?l va cac cay khac Dira dgi, chuoi, cacao Cam, quyt, dau tam, va, 15
hp thu'C v$t Cam, quyt, nho
Cam, quyt Cam, quyt
Cam, bu'oi, chanh, ca rot, bi, du'B hau, du'a bo, du'a chupt, lyu, nho, ngo, dau tam, cu
cai du'O'ng, Cam, quyt Cam, quyt Mia, cao lu-ong, cay hp hoa thao Cha la, trong to kien
Mia
Cam, quyt, hong, xoai Cam, quyt, chanh, chap, vai
Cam, quyt, du du Cam, quyt, du du
Cam, quyt Cam, quyt, che
Cam, xoai, Cam Cam, ca phe Cam, quyt, ca phe, cacao
Cam
Cam Cam, quyt, xoai
Cam, quyt
Dja diem thu
TP. HCM TP. HCM TP. HCM HN, HT H N , D L HN, HB H N , T G HB, HN, HT H N , T P . HCM
TG, CB
TH TH BT VP, TD
BT H N , T P . HCM, TG H N , H B , HT, LD.DL,
TP. HCM TP. HCM TP. HCM, HN, HB
HB, HN, HT HT, HN, VP VP, TP. HCM H N . V P , TP. HCM
HN, HT LO, TP. HCM, HN
HN, HT TP. HCM, CC
TP. HCM TP. HCM
HN
HN, HT, LO, TP. HCM
220
TT 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 *
73 74
Ten khoa hpc Saissetia oleae (Olivier) Saissetia psidii (Green) Syn: Lecanium psidii Green Parasaissetia nigra (Nicther) Syn: Saissetia nigra (Nicther) Vinzonia steiiifera (Westwood) HQ DIASPIDIDAE - REP P H A N Aonidiella aurantii (Maskell) Aonidiella citrina (Coquillett) Aonidiella comperei Mckenzie Aspidiotus destrucotor (Signoret) Aspidiotus excisus (Green) Aspidiotus nerii Bouche
Aspidiotus stauntoniae (Takanashi) Aulacaspis alisiana Takagi
Aulacaspis crawii (Cockerell) Aulacaspis thoracica (Robison) Chrysomphalus aonidum (Linnaeus) Syn: Ch. ficus (Ashmead)
Chrysomphalus bifasciculatus Ferris Chrysomphalus dictyospermi (Morgan) Diaspidiotus pemiciosus (Comstock) Duplachionaspis saccharifolii (Zehntner) Fiorinia euryae Kuwana
Fiorinia fioriniae (Targ. - Tozz.) Fioriniaja ponica Kuwana Fiorinia theae Green
tiemiberiesia lataniae (Signoret) Hemiberiesia palmae (Cockerell) Hemiberiesia rapax (Comstock) Ischnaspis longirostris (Signoret) Kuv/anaspis suishana (Takahashi) Lepidosaphes beckii (Newman) Lepidosaphes euryae (Kuwana) Lepidosaphes gloverii (Packard) Lepidosaphes pinnaeformis (Bouche) Lepidosaphes pseudogloverii (Boreh.) Syn: Insulaspis pseudogloverii Borchs.
Le pidosaphes rubuovittata (Cockerell) Lepidosaphes ulmi (Linnaeus)
Cay chu Cam Cam, buoi Cam, da so hgi cay canh
Cam, bu'oi Cam Cam Da thyc Cam, quyt Cam, quyt
Da, de, si Cam, cp Cam, chanh, bu'oi
Cam Cam, quyt (nghiem trpng) Tao, cay canh v& cay rOng
Rung tre Cam
Cam, thong, tiing, bach (it) Cam, quyt, che
Nhieu logi cay Cp Nhieu loai cay . Nhieu loai cay
Tre, nu-a Cam, bu'oi (nghiem trpng)
Che Cam, quyt
Cam Xoai Cam
Dja diem thu HN HN HN, HT, LD
TP. HCM HN, HT HN.TP. HCM
HN HN, HT, TP. HCM
TG HN HN HN, TP. HCM, SL
SL HB, HN, HT
HN, LD HN DL VP HN HN, HT HN.TP. HCM
HN TP. HCM, LD
TP. HCM LO HN HN, HT, VP
Chi thay if Vipt Nam TP. HCM
HN, HB
TT 75 76 11 78 79 80 81 82 83 84 85 86 87 88 *
89 90 91 92 93 94 . 95 96 97 98
Ten khoa hpc
Lopholeucaspis japonica (Cockerell) Mitlaspis malayana Hall et Wiliams Melanas smilacis (Comstock) Pariatoria alba Bellio
Pariatoria citri MeKenzie Pariatoria pergandii Comstock Pariatoria stigmadisculosa Bellio Pariatoria theae Cockerell
Pariatoria ziziphi (Lucas)
Pinnaspis aspidistrae (Signoret) Pinnaspis buxi (Bouch6) Pinnaspis strachani (Cooley) Pinnaspis theae (Maskell) Porogymnaspis silvestri Bellio Pseudaunidia trilobitiformis (Green) Pseudaulacaspis grandilobis (Green) Pseudaulacaspis cockerelli (Cooley) Pseudaulacaspis dendribii (Kuwana) Pseudaulacaspis pentagona (Targ. - Tozz.) Smilacicola heimi (Balachowsky) Stringaspidiotus curculiginis (Green) Thysanofiorinia neephelii (Maskeell) Unaspis citri (Comstock) ;
Unaspis yanonensis (Kuwana)
Cay chu Cam, hong
Dit a Cam, quyt, quat
Cam, bu'cci Cam Cay hp hoa thao
Cam, Quyt, ca phe Cam, quyt, mit
Cam, quyt Cam
Cam, quyt, ca phe
Da Ca phe Cay an qua va dau tam
Nam
Cam, bu'O'i (nghiem trpng) Cam
Dja diem thu HN SL
HN, TP. HCM . H N . V P , T P . H C M
HN, HB BT HN HB, HN, HT, TP. H c i / l , TG HN, T P . H C M HN, VP, TP. HCM
VP, TP. HCM
Chi thay o Vipt Nam HN, T P . H C M , LD
TP. HCM, LD HN, TP. HCM
LD LD
HN HN HN HN
Ghi chu: HN: Ha Npi; HT: Ha Tay, HB,: Ha B5c; TP. HCM: TP. H6 Chi Minh; TG: Ti6n Giang; LD: Lam D6ng; SL: Som La; VP: VTnh Phiic; DL: D^ Lat; TH: Thanh Hoi; BT: Bac Thdi; BL: Bao Lpc;
CB: Cai B^; HM: H6c Mon; TD: Tam Dao (*) Mdi chi thiy d Viet Nam.
TAI LIEU THAM KHAO
1. Danzig E.M., Konstantinova G.M., 1990: On the fauna of scae - insects (Homoptera, Coccinea) of Vietaam. Proceedings of Zoological Institute, Leningrad Vol. 209 Part 1:38 - 52.
2. D.J Williams and Gillian W. Watson, 1988: The scale insects of the tropical South Pacific Region.
C.A.B, International Institute of Entomology. Part 1: The Armoured Scale (Diaspididae).
3. D.J. Williams and Gillian W. Watson, 1988: The scale insects of the tropical South Pacific Region.
C.A.B. International Institute of Entomology. Part 2: The Mealy Bugs (Speudococcidae), 266p.
4. D.J. Williams and Gillian W.Watson, 1988: The scale insects of the tropical South Pacific Region. C.A.B.
International Institute of Entomology. Part 3: the Soft Scales (Coccoidae) and other families, 266p.
5. E.S. Sugonyayev, 1996: Ants nesting on living plants in the tropics an refuges for soft. Scale insects (Homoptera, Coccidae), Protecting them fi-om Attacks of Chalcidoid parasites (Hymenoptera, Chalcidoidae).
6. Vien BSo ve thirc vat, 1976: KSt qua dilu tra con triing 1967 - 1968. tr. 68 - 72. Nha xuit bto Nong thon.
7. Pham Van LSm, 1994. Thanh phin rep sdp hai cay an qua c6 miii phat hien 6 Viet Nam. Tap chi
•• BVTV, s6 4, tr. 14-17. u,- o;- .. - • . ; . , ' . , . . . . < . ' • • • • . , • ..•
8. Nguyin ViSt Tiing, Tran Diic Ha, 1977: Bao cao khoa hpc ky thuat nong nghiep, Tniong Dai hpc . Nong nghiep I Ha Npi. tr. 151 - 159.
SUMMARY
The study scales on citrus and ormental plant in Hanoi area
( . , . < ' Vii Quang Cdn, Dgng Thi Ddp, TruongXudn Lam, . I . , ,,• Nguyen Thi Phuong Lien
Result of the study on scales on citrus and ormental plant in Ha Noi area: Field collection have 20 scales samples consist of 4 families Coccoidae, Pseudococcidae, Diaspididae and Margarodidae (see the table 2). There are 7 samples of parasites of scales collected belonging to 2 families Chalcidoidae and Encyrtidae. In the non-spray pilot, everage density of scales and incidence of parasite resp. 219,98 ± 31,78 and 10,44 ± 1,65% while in the spray pilot in 131,94 ± 17,41 and 11,34 ± 1,44%. The solution of ST3 mixed with Trebon 30EC may kill scales on Cycas revoluta Thur\g with high effect.
Beside, in the paper also introduce the list of scale in Viet Nam of E. M. Danxick, 1990 and Pham Van Lam, 1994 consist of 100 species belonging to 6 families.
