Bước đầu nghiên cứu đặc điểm sinh học của Bọ rùa mắt trắng Lemnia Biplagiata Swartz, 1808 (Coleoptera: Coccinellidae)

HOI NGH! KHOA HOC T O A N Q U O C Vg SINH THAI V A TAI N G U Y £ N SINH VAT L^N THLf BA<br /> <br /> <br /> <br /> BU'OfC DAU NGHIEN CUtJ DAC D I E M SEVH H Q C CUA B O RUA M A T TRANG<br /> LEMNIA BIPLAGIATA Swartz, 1808 ( C O L E O P T E R A : C O C C I N E L L I D A E )<br /> <br /> NGUYEN QUANG CLTONG, VU THI CHI, NGUYEN TH} HANH<br /> Vi^n Sinh thdi vd Tdi nguyen sinli vdt<br /> <br /> Bg riia mit trang Lemnia biplagiata Swartz (Coleoptera: CoccineUidae) Ii loai bg nia thien<br /> dich phd biln d Tmng Qudc; chiing dugc sir dyng trong phdng trir sinh hgc ddi vdi rep bdng<br /> Aphis gossypii (Glover), rgp dio Myzus persicae (Sulzer) vi mgt sd loii khic thudc bd Cinh giong<br /> Homoptera (Yao vi Tao, 1972; Deng et al., 1987; Tao, 1990). Bg riia mit tring L. biplagiata<br /> cung da dugc nghien ciiu vi sir dung d An Do (Saharia, 1980). 0 Lien Xd (cii), bg nia mat trang<br /> dugc nhap vl tir Viet Nam de phdng trir sinh hgc R?p A. gossypii hai dua chugt va M. persicae<br /> hai cay hd tieu trong nhi ludi (Tverdyukov et al., 1993) va dugc ggi Ii bg nia Viet Nam. Day la<br /> loai bg riia in tap va phd ky chu ciia nd Ii cic loai rep hai fre, liia, ngd, rau, cac loai dau va cay<br /> in qua. 0 Vigt Nam, cho den nay chua cd mgt cdng trinh nghien ciru nao de cap den viec<br /> nghien ciiu ve cic die diem sinh hgc cua Bg riia mit trang.<br /> Bai viet niy cdng bo mgt sd ket qui nghien ciiu budc dau ve mgt sd die diem sinh hgc<br /> CO bin cua loii bg riia mit trang L. biplagiata (BRMT) lam co sd cho viec chgn lya vat chii lam<br /> thiic an phuc vu cho cdng tic nhan nudi bg riia mat frang frong phdng thi nghigm.<br /> <br /> L PHUOfNG PHAP NGHIEN CUtJ<br /> 1. Vat li^u nghien ciru<br /> Nghien ciiu sinh hgc cua bg riia mit tring {Lemnia biplagiata Swartz) dugc thyc hien vdi hai<br /> loai thiic in khic nhau Ii rep mia va rgp dau mau den {Aphis craccivora Koch), rgp mia<br /> (Ceratovacula lamigera Zehntner) frong phdng thi nghiem.<br /> 2. Phuo'ng phap nudi<br /> Nudi bg riia theo phuong phip nudi ca the, tiln hanh theo ddi hang ngay, thay va bd sung<br /> thiic in thudng xuyen cho bg nia.<br /> 3. Cac chi tieu sinh hgc<br /> Ddi vdi ci hai cdng thirc thi nghi?ni vdi 2 loai thirc an la rep mia va rep dau mau den, cic chi<br /> tieu sinh hgc dugc theo ddi la ty Ig nd cua triing; thdi gian phit trien cic pha; kich thudc cua au<br /> triing cic tudi; khi nang in mdi cua iu trimg BRMT.<br /> <br /> n . KET QUA NGHIEN CLTU<br /> 1. Ty lg nd ciia trung Bg riia mat trang Lemnia biplagiata Swartz<br /> De xac dinh ty le nd ciia tning BRMT chiing tdi tiln hanh thu giu frirng cua tmdng thanh tir<br /> ngiy thir 3 sau khi da ghep ddi giao phdi v i de trumg. Mdi d trirng dugc tich rieng va de vao<br /> timg Ig nhya cd bit nap vii de tranh iu triing bd di sau khi nd. Theo ddi trimg nd tir ngay thir 2<br /> sau khi de trd di cho den khi khdng nd nira. Moi ngiy kilm tra 3 lin dl tach iu triing ngay sau<br /> khi nd, trinh viec au trimg se in thit lan nhau. Kit qua xic dinh ty le nd ciia tning BRMT dugc<br /> trinh biy d bing 1.<br /> Ket qua d bang 1 cho thiy ty Ig nd cua triing BRMT d tit ci cac d theo ddi diu d miic kha<br /> cao, tir khoang 80% cho din 100%, trung binh dat ty le nd la 87,43%; tuong duong ty le nd cua<br /> <br /> <br /> 1252<br />  HQI NGH! KHOA HQC TOAN QUOC V £ SINH THAI VA TAI NGUYEN SINH VAT LAN THU BA<br /> <br /> bo riia chir nhan C. transversalis (87%) va thap hon so vdi bg riia dd nhat ban P. japonica (tren<br /> 97%) (Nguyen Thj Hanh (2006); Mai Phii Quy (2005)).<br /> Bdng I<br /> Ty 1? nd cua trung Bg riia mat trang L. biplagiata<br /> Tong so Ty If nd<br /> 6 trii'ng So truTig nd Nhift dp Am d9<br /> tru'ng/o (%)<br /> 1 62 54 87,10 22,0 80,3<br /> 2 31 31 100,00 22,7 96,0<br /> 3 42 34 80,95 24,1 94,3<br /> 4 35 30 85,71 25,4 92,3<br /> 5 21 18 85,71 26,6 89,3<br /> Trung binh 87,43<br /> <br /> 2. Thdi gian cac giai doan sinh trudng ciia bg riia mat trang L. biplagiata<br /> Ngoai dong rudng, BRMT thuomg dugc bit gap tren cac rugng trdng ngd, mia, dau do va cd<br /> mgc hoang. Theo quun sit vi ghi nhin cua chung tdi, BRMT sinh tmdng va phit trien tdt khi in<br /> rep mia tai cic khu vuc trdng mia ngoai ty nhien. Vi viy, chiing tdi tien hanh cic thi nghiem thir<br /> nghiem khi nang su dung 2 loii rep la: rfp mia vi r?p diu mau den de sir dung lam thirc in<br /> phuc vu cho cic boat ddng nghien ciru khic vl loii BRMT trong phdng thi nghiem.<br /> 2.1. Thdi gian cac giai doan sinh trudng vdi thirc an la rfp mia<br /> Kit qua thi nghigm xic dinh thdi gian phit triln ciia cic giai doan sinh trudng ciia BRMT<br /> vdi thirc in Ii rep mia dugc trinh bay d bing 2 vi 3. Kit qui cho thiy, thdi gian phit trien trung<br /> binh ciia trimg la 2,08±0,10 ngiy, ciia iu triing tudi 1 la I,39±0,l 1 ngiy, cua iu trimg tudi 2 Ii<br /> 1,70±0,13 ngiy, ciia iu trimg tudi 3 Ii 2,90±0,23 ngay, ciia iu triing tudi 4 Ii 1,15±0,11 ngiy,<br /> ciia giai doan nhdng Ii 2,44±0,23 ngay, cua trudng thanh la 1,78±0,37 ngay.<br /> Vdi thi nghifm nay chiing tdi tiln hanh theo ddi tir tdng so 247 qui trimg BRMT va sau<br /> khiTrimg nd toan bg da thu dugc 198 iu trimg tudi I, sd iu triing niy dugc tach rieng ra cic Ig<br /> nhya nhd da dugc cung cip sin thirc in la rgp mia de nudi ci the, mdi ngay kiem tra va thay<br /> thirc in 1 lin. Tir 198 iu triing tudi 1 phit triln den giai doan au triing tudi 2 cdn 176 au triing,<br /> sang din tudi 3 cdn 79 iu triing, tuoi 4 cdn 59 iu triing, sang den giai (loan nhdng cdn 41 con<br /> va din giai doan trudng thanh thi chi cdn 32 con. Tuy nhien, so ci thi trudng thanh niy sau<br /> khi vu hda, phin Idn diu cd cinh bj di dang (cong, khuylt, van veo, xde ra) vi chet chi sau<br /> khi vu hda mgt vai ngiy. Cung theo kit qui d bing 2 cho thiy, ty le nd ciia trimg dat 80,16%;<br /> ty 1? ci thi hoan thanh giai doan iu triing vao dugcnhdng Ii 20,71%; ty le nhgng vu hda<br /> trudng thanh dat 78,05%; nhu vay sd ca thi phit triln dugc tir giai doan trimg den trudng<br /> thanh chi d muc rit thap 12,96%.<br /> S6 lifu d bang 2 cung cho thiy ring, vdi thiic in Ii rep mia thi d tit ci cic giai doan smh<br /> tnrdng diu cd hien tugng cic c i thi hoan thanh giai doan khdng tap trung ma thucmg keo dii<br /> trong nhilu ngay lien tilp. Quan sit trong khi tiln hanh thi nghifm chiing tdi thay rang hiu bet<br /> cac ca thi cd thdi gian phit triln keo dai hon so vdi gia fri tmng binh thudng cd sire sdng kem,<br /> mgt sd khdng hoan thanh dugc pha phat triln, mgt sd iu trimg bi chit trong qua frinh lot xac hay<br /> khi nhdng dang vu hda; cdn mgt so thi hoan thanh dugc pha phat frien dd nhung sang pha phat<br /> trien ke tilp cung rit ylu va hiu hit deu chet d pha ke tiep nay.<br /> <br /> <br /> <br /> 1253<br />  HOI NGHI KHOA HOC T O A N Q U O C V £ SINH T H A I V A T A I N G U Y £ N SINH VAT L^N THLf BA<br /> <br /> <br /> Bdng 2<br /> So lugng ca the va thdi gian hoan thanh cac pha ciia BRMT vdi thirc an la rfp mia<br /> Thoi gian AT AT Tgsong<br /> Tning AT moi AT tuoi NTi9ng NTiift Am<br /> phat tuoil tuoi 2 TT<br /> (n=247) 3 (n=79) 4 (n=59) (n=41) dg d9<br /> trien (n=198) (n=176) (n=32)<br /> 1 ngay 37 148 85 11 52 5 20 27,1 89<br /> 2 ngay 177 34 71 10 5 14 1 27,4 73,7<br /> 3 ngay 20 5 11 38 2 21 9 26,4 77,7<br /> 4 ngay 3 11 6 16 0 1 2 26,4 79,0<br /> 5 ngay 10 0 3 4 0 0 0 27,7 74,3<br /> <br /> Bdng 3<br /> Thdi gian cac giai doan sinh trudng cua BRMT vdi thuc an la rfp mia<br /> AT AT AT AT<br /> Thoi gian Tnj-ng Nhgng Tg song NTiift Am d9<br /> tuoil tuoi 2 tuoi 3 tuoi 4<br /> phat trien (ngiy) (ngay) TT (ngay) dO(%) (%)<br /> (ngay) (ngay) (ngay) (ngay)<br /> trung binh<br /> 2,0&t0,10 1,39±0,11 1,70±0,13 2,90±0,23 1,15±0,11 2,44±0,23 l,78i:0,37 27,0 78,7<br /> <br /> 2.2. Thdi gian cac giai doan sinh truo'ng vdi thirc an la rfp dau mau den<br /> Ket qua thi nghiem xac dinh thdi gian phat trien cua cic giai doan sinh tmdng cua BRMT<br /> vdi thiic in Ii rep dau mau den trong dieu kifn phdng thi nghifm dugc trinh biy d bang 4 va 5.<br /> Bdng 4<br /> So lugng ca the va thdi gian hoan thanh cac pha ciia BRMT vdi thiic an la rfp dau mau den<br /> AT AT AT AT GD<br /> Thoi gian Trii'ng NhQng Nhift<br /> Tl T2 T3 T4 tmdcde Am dp<br /> phat trien (n=60) (n=60) dp<br /> (n=60) (n=60) (n=60) (n=60) (n=30)<br /> 1 ngay 0 40 58 50 0 0 0 27,1 89<br /> 2 ngay 60 20 2 10 26 2 0 27,4 73,7<br /> 3 ngay 0, 0 0 0 33 ' 56 3 26,4 77,7<br /> 4 ngay 0 0 0 0 1 2 19 26,4 79,0<br /> 5 ngay 0 0 0 0 0 0 8 27,7 74,3<br /> <br /> Bdng 5<br /> Thdi gian phat trien ciia cac giai doan sinh tnrd-ng cua BRMT vdi thuc an la rfp dau mau den<br /> AT AT AT AT<br /> Thoi gian Trii'ng Nhgng SD trudc Nhift Am dp<br /> (ngay) Tl T2 T3 T4<br /> phat trien (ngay) de(ngay) dg (°C) (%)<br /> trung binh (ngay) (ngay) (ngay) (ngay)<br /> 2,00±0,00 ,33±0,12 1,03±0,05 1,17±0,10 2,58ifl,13 3,0a±0,07 4,17±0,21 27,0 78,7<br /> Theo ket qua d bang 4, toin bg so tning theo ddi diu nd sau khi de 2 ngay, phin Idn iu triing<br /> tir tudi 1 den tudi 3 lot xac qua tudi sau 1 ngay, so cdn lai phai mit 2 ngiy dl hoan thanh giai<br /> doan phit trien. Vdi iu triing tudi 4, thdi gian dl hoan thanh giai doan phat triln la 2 din 3<br /> <br /> <br /> 1254<br />  HOI NGHI KHOA HQC TOAN QUOC V£ SINH THAI VA TAI NGUY£N SINH VAT LAN THU BA<br /> <br /> ngay, ca bift cd trudng hgp keo dii din ngi;y thir 4. Pha nhong, hiu hit cic tmdng hgp hoan<br /> thanh pha phit friln vio ngay thii 3 sau khi au triing fridi 4 vao nhdng, mgt sd it ci thi cd thdi<br /> gian phit frien sdm hon hoic mugn hon so vdi nhumg ci thi d tren 1 ngay.<br /> So lifu ghi I^i d bang 5 cho thiy, thdi gian phit friln frung binh cua tning la 2,00±0,00 ngiy,<br /> ciia iu tning tudi 1 la 1,33±0,12, ciia iu trimg tudi 2 Ii 1,03±0,05 ngiy, ciia iu trimg'tudi 3 Ii<br /> 1,17±0,10 ngiy, cua iu triing tudi 4 la 2,58±0,13 ngay, cua giai doan nhdng Ii 3,00±0,07 ngiy.<br /> Nhu vay, khi nudi BRMT bing rep dau A. craccivora thi toin bg iu triing tir tudi 1 din tudi<br /> 3 deu hoin thinh giai doan phit trien ciia chiing trong khoing thdi gian 1 din 2 ngiy lien tilp<br /> sau khi lot xic, thdi gian phat trien cua au trimg tudi 4 keo dai ban vi ciing xuit hifn mgt so<br /> tmcmg hgp thdi gian Igt xic bi keo dai nhumg khdng nhilu vi d tudi nay chiing cin sir dung mgt<br /> lugng thirc in nhieu hon de chuan bi cho qui trinh lot xic chuyin sang mgt pha mdi hoan toin.<br /> 6 tudi 4, au trimg BRMT rat nhay cim vdi nhirng thay ddi xung quanh (chii ylu la vdi<br /> nhimg thay ddi ve thirc an vi nhift do mdi trudng), cd thi coi diy Ii mgt trong nhirng giai doan<br /> xung yeu nhat trong qui trinh phit trien ciia chiing. Sy phit friln ciia iu triing d tudi 4 se quylt<br /> djnh den khi ning vio nhdng cung nhu kich thudc cua nhgng vi tmdng thinh sau niy.<br /> Trudng thinh BRMT sau khi vii hda tu nhgng cin phii trii qua mgt thdi gian diu dl cd thi<br /> dat tdi giai doan phit trien thinh thyc. Trong thdi gian niy chiing can dugc cung cip diy dii<br /> thirc in de tich liiy ning lugng sir dyng cho cic hoat dgng sdng ciing nhu sy phit triln ciia co<br /> quan sinh sin. Theo ket qui d bing 4, giai doan trudc de tning ciia trudng thanh BRMT la<br /> 4,17±0,21 ngay. Cic ket qui d bing 3 vi bing 5 cho thiy khi nudi BRMT bing 2 loai thirc in<br /> khac nhau thi tdng thdi gian phit trien tu giai doan tning cho den giai doan trudng thanh cd sy<br /> khac nhau khdng Idn. Vdi thirc in Ii rfp mia thi thdi gian niy trung binh khoing 12 ngay, cdn<br /> vdi thirc in Ii rfp dau mau den Ii khoang 11 ngiy. Tuy nhien sy khic nhau khi nudi bang 2 loai<br /> thuc in niy lai the hifn rd khi so sinh d timg tudi.<br /> Sau khi da tich liiy dugc lugng dinh dudng cin thiet thi frudng thinh BRMT bit diu cd<br /> hoat ddng cip ddi giao phdi va de trimg sau dd. Ket qui thi nghifm theo ddi ve thdi gian sdng<br /> va khi ning de trimg cua trudng thinh vdi thirc in la rfp dau miu den dugc trinh bay d bing 6.<br /> Bdng 6<br /> Thdi gian song va kha n3ng de tning cua BRMT trudng thanh vdi thiic in la rfp dau mau<br /> den (n=30 cap)<br /> Thcri gian song (ngay)<br /> Chi tieu theo doi So trirng de/cSp<br /> Con 6\fc Con cai<br /> Max 85 100 2074,00<br /> Min 17 ' 21 396,00<br /> TB 40,4J±6,74 54,60±9,42 1113,07±196,26<br /> <br /> Thdi gian song ciia frudng thanh BRMT doi vdi con dye Ii 40,3±6,4 ngay vi vdi con cii la<br /> 54,0±9,42 ngiy, tdng so tning de trung bmh ciia 1 con cai Ii 1113,07±196,26 qui. So vdi cic kit<br /> qua nghien cim frudc day da cdng bd vl loii bg riia chii' nhin Coceinella transversalis, bg riia_6<br /> vin Menochilus sexmaculatus va bg riia dd nhat bin Propylea japonica ciia cac tic gii Nguyen<br /> Thj Hanh (2006, 2008), Pham Huy Phong (2006), Mai Phii Quy (2005) thi BRMT cd thdi gian<br /> song ciia tmdng thanh tuong duong vdi bg riia 6 vin (tmng binh la 50 ngiy) vi bg riia dd nh^t ban<br /> (thdi gian song frung binh ciia con cii Ii 51 ngay, ciia con dye Ii 57,8 ngiy) vi cao hon mdi thg<br /> tning binh ciia loii bg riia chii nhan (25 ngiy). Sd lugng tning de tmng bmh ciia mgt con cii<br /> <br /> <br /> 1255<br />  HOI NGHI KHOA HQC TOAN Q U O C V £ SINH THAI V A TAI N G U Y £ N SINH VAT I^N THLT BA<br /> <br /> <br /> BRMT ciing mong duong vdi cua bg riia 6 vin (1131,67 qua) va cao hon rat nhieu so vdi cua 2<br /> loai cdn lai Ii bg nia chii nhan (918 qui) va bg riia do nhat ban (430 qua).<br /> 3. Kich thudc au triing cua Bg rua mat trang L. biplagiata vdi thuc an la rfp mia va<br /> rfp dau mau den<br /> Kich thudc cua iu trimg BRMT vdi hai loai thirc in la rfp mia vi rep dau mau den dugc<br /> trinh bay d bing 7 vi bing 8.<br /> Bdng 7<br /> Kich thudc ciia au triing BRMT vdi thirc an la rfp mi'a<br /> <br /> Chi tieu Au triing<br /> theo doi Tuoi 1 (n=51) Tuoi 2 (n=49) Tuoi 3 (n=40) Tuoi 4 (n=38)<br /> Chilu dai TB 2,00±0,10 2,81±0,19 5,41 ±0,23 6,54±0,40<br /> Rdng diu TB 0,39±0,01 0,49±0,02 0,73±0,02 0,91±0,02<br /> Rdng ngyc TB 0,66±0,02 0,75±0,03 1,18±0,04 1,44±0,05<br /> <br /> Bdng 8<br /> Kich thudc ciia au triing BRMT voi thirc an la rfp dau mau den<br /> Au triing<br /> Chi tieu theo doi<br /> Tuoi 1 (n=40) Tuoi 2 (n=40) Tuoi 3 (n=40) Tuoi 4 (n=40)<br /> Chieu dai TB 1,91±0,08 3,36±0,16 5,84±0,25 7,99±0,17<br /> Rong dau TB 0,35±0,01 0,49±0,02 0,77±0,03 0,96±0,02<br /> Rong ngyc TB 0,57±0,02 0,92±0,04 1,58±0,07 2,15±0,06<br /> Sd lifu frinh biy d bing 7 vi bing 8 cho thay d c i hai cdng thirc nudi vdi hai loai thiic in<br /> khic nhau thi chieu rdng cua minh dau d tat ci cac tudi la tuong duong nhau. Sy khic bift gifra<br /> iu triing cic tudi khi nudi bang 2 loai thu:c in dugc the hifn ve chieu dii cua than va chieu rdng<br /> ciia ngyc. O giai doan iu trimg tudi 1 thi ca 3 chi tieu theo ddi ve kich thudc deu khdng cd sy sai<br /> khic Idn giira 2 cdng thiirc nudi. Tir mdi 2 din tudi 4 thi c i chieu dii than vi chilu rdng ngyc cua<br /> iu trimg khi nudi bang rep diu mau den deu Idn hon so vdi khi nudi bing rfp mia va sy chenh<br /> Ifch niy ting dan theo timg tudi ciia au triing. Nhu viy, trong dieu kifn phdng thi nghifm thi su<br /> dung rfp dau mau den lam thuc an cho nhin nudi BRMT tdt hon so vdi sir dung thurc an Ii rfp mia<br /> 4. Kha nang an rfp dau ciia au triing BRMT<br /> Tir nhan dinh tren ve sy thich hgp khi nudi BRMT trong phdng tiii nghifm bing rfp dau mau<br /> den, chiing tdi tiep fric tifn hinh tiii nghifm xac dinh kha ning in cua iu triing BRMT doi vdi loii<br /> rep nay. Ket qui thi nghifm dugc frinh biy d bang 9. ..<br /> Tmng binh mdi iu trimg tudi 1 BRMT tieu thu khoang 38±3 rep, vdi tudi 2 la 71+7 rfp, tudi<br /> 3 la 92±8 rfp va fridi 4 la 170±14. D I hoin thinh giai doan iu triing thi moi ci thi bg nia tieu<br /> thu khoang 370±20 rfp. So vdi kha nang in mdi cua au trimg cua 3 loii bg riia: bg riia chir nhan<br /> Coceinella transversalis, bg riia 6 van Menochilus sexmaculatus va bg riia dd nhat bin Propylea<br /> japonica {?ham Huy Phong, 2007; Mai Phii Quy, 2005; Nguyen Thanh Manh, 2008) thi kha nang<br /> an mdi au trimg BRMT tiiip hon ciia iu trimg bg riia chir nhan (tmng bmh 451±14 rfp) nhung<br /> <br /> <br /> 1256<br />  HQI NGHI KHOA HQC TOAN QUOC V£ SINH THAI VA TAI NGUYgN SINH VAT LAN THU BA<br /> <br /> cao ban so vdi ciia au triing bg riia 6 vin (trung binh khoang 230 rfp) va bg riia dd nhat bin<br /> (trung bmh 257±7 rfp).<br /> Bdng 9<br /> Kha nang an rfp dau cua au trimg BRMT<br /> <br /> So rfp tieu th\i/l Tuoi 1 Tuoi 2 Tuoi 3 Tuoi 4<br /> Tong so<br /> ca the n=49 n=46 n=45 n=37<br /> Tmng binh 38±3 71±7 92±8 170±14 370+20<br /> Min-^Max 10^60 20^124 40^140 85+270 220+495<br /> <br /> III. KET LUAN<br /> - Ty If nd cua trimg BRMT tmng binh dat 87,43%.<br /> - Khi nudi Bg nia mit tring bang 2 loai thirc in khic nhau (rfp dau miu den vi rep mia) thi<br /> ting thdi gian phit trien tir trimg den trudng thinh sai khic nhau khdng Idn (12 ngay vdi thirc<br /> in la rfp mia, 11 ngiy vdi thirc in Ii rfp diu mau den); tuy nhien sy sai khic nhin thiy dugc<br /> khi so sinh timg tudi.<br /> - Thdi gian sdng ciia trudng thinh BRMT doi vdi con dye Ii 40,3±6,4 ngay vi vdi con cii la<br /> 54,0+9,42 ngay, tdng sd trung de tmng binh ciia 1 con cai la 1113,07+196,26 qui.<br /> - Khi nudi iu frimg BRMT vdi hai loai thirc in khic nhau (rfp diu miu den vi rfp mia) thi<br /> chilu rgng ciia minh dau d tit ci cic tudi Ii tuong duong nhau; my nhien, chieu dai than va<br /> chilu rgng ngyc cua iu trimg khi nudi bing rfp dau miu den Idn ban so vdi khi nudi bing rfp mia.<br /> - d giai doan iu trimg, trung binh moi ca thi BRMT tieu thy khoing 370±20 rfp.<br /> <br /> TAI LifU THAM KHAO<br /> 1. Bg Khoa hgc va Cong nghf, Vifn Khoa hgc va Cong nghf Vift Nam, 2007: Dgng vit<br /> , chi Vift Nam, T. 24 - Hg Bg Riia (CoccineUidae - Coleoptera). NXB. Khoa hgc vi Ky tiiuit.<br /> Hi Ngi.<br /> 2. Tran Dinh Chien, 2002: Nghien ciiu cdn trimg, nhfn Idn bit mdi siu hai dau tuong viing<br /> Hi Ndi vi phu can, die tinh sinh hgc ciia bg chin chay Chlaenius bioeulatus Chaudou vi<br /> bg nia Menochilus sexmaculatus Fabr. Luan in Tiln sT Ndng nghifp. Hi Ngi.<br /> 3. Nguyen Thj Hanh, Mai Phii Quy, Vu Thj Chi, 2008: Bd sung mgt sd die diem hmh<br /> thii, sinh vat hgc ciia bg riia dd nhit bin Propylae japonica (Thunberg, 1781) (Insecta:<br /> CoccineUidae). Bio cio khoa hgc, Hgi nghi Cdn frmng hgc toin qudc lin thii 6. NXB.<br /> Ndng nghifp. Hi Ngi, 86-96.<br /> 4. Nguyen Thj Hanh, Mai Phii Quy, Vu Thj Chi, Nguyen Thj Thuy, 2006: Nghien cim<br /> mgt so die dilm huih tiiii vi sinh vat hgc ciia bg riia dd nhit bin Propylae japonica<br /> (Thunberg, 1781). Bio cio khoa hgc, Hgi thio khoa hgc cdng nghf quin Iy ndng hgc vi<br /> sy phit friln ndng nghifp bin vimg d Vift Nam. NXB. Ndng nghifp, 434-440.<br /> Pharam Van Lam, 2005: Mgt so kit qui nghien cim vl thien dich ciia rfp mugi. Bao cao<br /> khoa)a hoc,<br /> hgc, Hdi nghi Cdn triing hgc toin qudc Ian thu 5. NXB. Ndng nghifp. Ha Ngi, 87-<br /> Hgi nghi<br /> 92.<br /> <br /> <br /> <br /> 1257<br />  HOI NGHI KHOA HQC TOAN Q U O C V £ SINH THAI V A TAI N G U Y £ N SINH VAT LAN THU' BA<br /> <br /> <br /> 6. Nguyen Thanh Manh, Mai Phii Quy, 2008: Anh hudng cua thiic in din mgt sd die<br /> dilm sinh hgc cua Bg riia chir nhan Coceinella transversalis Fabr. (Col.: CoccineUidae)<br /> vi vai frd ciia nd trong phdng frir rfp mugi hai rau. Bio cao khoa hgc, Hgi nghi Cdn trimg<br /> hgc toan qudc Ian thiir 6. NXB. Ndng nghifp. Hi Ngi, 213-219.<br /> 7. Quach Thj Ngg, 2002: Thanh phin rfp mugi da thu thap dugc tren mgt so cay trdng d<br /> dong bing sdng Hong va vimg phu can. Bio cao khoa hgc, Hgi nghj Cdn trimg hgc toan<br /> quoc lin thii 4. NXB. Ndng nghifp, Hi Ngi, 327-333.<br /> 8. Pham Huy Phong, Bui Tuan Vift, Nguyen Thj Thuy, 2007: Nghien ciru mgt so die<br /> dilm sinh hgc cua bg riia siu vin Menochilus sexmaculatus Fabr. (CoccineUidae,<br /> Coleoptera) khi nudi bing rfp dau den Aphis craccivora Korch. Bio cio khoa hgc, Hgi<br /> nghi khoa hgc toan qudc vl Sinh thii v i Tii nguyen sinh vat lan thii hai. NXB. Ndng<br /> nghifp. Hi Ngi, 524-529.<br /> 9. Pham Huy Phong, D3ng Thj Dung, Mai Phii Quy, 2006: Nghien ciiu mgt sddac dilm<br /> hinh thii vi sinh vat hgc cua bg nia siu van Menochilus sexmaculatus Fabr.<br /> (CoccineUidae, Coleoptera). Bio cio khoa hgc, Hgi thao khoa hgc cdng nghf quan 1^<br /> ndng hgc vi sy phat friln ndng nghifp bin vimg d Vigt Nam. NXB. Ndng nghiep. Ha Ngi.<br /> lO.Mai Phii Quy, Nguyen Thanh Manh, Vu Thj Chi, 2005: Mgt so die dilm sinh hpc cua<br /> bg nia chir nhan Coceinella transversalis Fabr. (Coleoptera: CoccineUidae). Bao cio khoa<br /> hgc, Hgi nghi Cdn trimg hgc toin quoc lan thii 5. NXB. Ndng nghifp. Ha Ngi, 181-183.<br /> <br /> PRELIMINARY STUDY ON THE BIOLOGY OF LADYBIRD<br /> LEMNIA BIPLAGIATA Swats, 1808 ( COLEOPTERA: COCCINELLIDAE)<br /> <br /> NGUYEN QUANG CUONG, VU THI CHI, NGUYEN THI HANH<br /> <br /> SUMMARY<br /> <br /> Lemnia biplagiata is one species of the predatory and widely distributed ladybirds in<br /> Vietnam. This article presents initial data on the biology of Lemnia biplagiata. The rate of egg-<br /> hatching of Lemnia biplagiata reaches 87.43%. The total time of development from egg to adult<br /> is not much different from each other when they are fed on two different kinds of foods (12 days<br /> with sugarcane aphid Ceratovacuna lanigera Zehntner and 11 days with black aphis Aphis<br /> craccivora Koch). However, the difference can be recognized while comparing the instars<br /> larvae. Adult longevity is 40.3+6.4 days for males and 54.0+9.42 days for females. The total<br /> number of eggs laid by each female is 1113.07+196.26 eggs on the average. The widths of<br /> heads are equivalent to each other in all the instars when larvae are fed on different kind of<br /> foods (sugarcane aphid C. lanigera and black aphis A. craccivora). However, body length and<br /> thorax width of larvae fed on A. craccivora are always longer and larger than the ones fed<br /> on C. lanigera. In the larval stage, each of larvae consumes about 370±20 aphids.<br /> <br /> <br /> <br /> <br /> 1258<br />