pj()(eecllllq, o! tile 7/11 lutei uat uiu«! WU/I',lIlq COli tel I'mI' 01/ Stcu ed-prohu ! PIO/ec/IOII - Voluille Development and reproduction of Callosobruchus chinensis ( Coleoptera: Bruchidae) on four legume plant seeds Yongxue Deng, Longvhu LI and Zhimo Zhao' Ab,/i'Uc/ Effects of commercially grown legume plant seeds on the development, sun ivorslup , and reproduction of the Chmese cowpea weevil, Cal/u'obllu:lw., clunetiu-: were studied in the laboratory The percentage of Immature stages that survived on mungbean , Plta-eotus ailleu." adzki bean, P a uqulini«, soybean. GII/Cille mcn , and broad bean, VI(/a ioba at 30 ± 1°C were lJI .i, 87 3, 63 5. and ,,(6 OSb, respecuvely Developmental time from egg to adult ranged hom 22 I d on mungbean to 37 "(d on soybean The average number of eggs laid pel female were S..( I. 72 I, ..(..(3, 18 3 on the above respective hosts and temale adults lived on an average at 7 8. 7 5, 5 6, and 6 2d on these same host seeds The mtnnsic rate of natural mcrease ( I) for Cal/u;,oln 11(/111" chineu-i-. on mungbean was the highest 1,1' vaned from 0 07663 on mungbean to 0 0.3,,(,,(28on broad bean Based on life-table analvses ot Chmese cowpea weevil populations, we conclude that mungbean was the most suitable host for C (hlilei/I-I;, and broad bean the least suitable Introduction The brucllld Cal/o;,ohillclllll> clllllell'lI> (L ) IS a senous pest of stored legume seeds (Southgate, 1978) Eggs are laid on the seeds surface m storage or pods m the held and lan-ae develop wlthm seeds causmg weight loss, decreased gell1unatlOn potential and reductIOn m commerCIal yalue (Caswell, IlJ81) Beetle populatIOns bUild lapldly m stOlage and damage m telms of holed seeds can mClease to 9lJ c ,u aftel 6 months (Seck et al , IlJlJI) The seeds may be almost completely hollowed out by feedmg actmtles of the lan-ae, and chalactenstlC emelgence hole are eVident atter the adult leave the seeds 01l10,ohlllch II" IS one of the most Widespread speCIes of genus Cal/ol->ohl Uc!IIIi> (Southgate, IlJ7S, Howe et al. 19M) !\1ungbean, Plw,eoilli> 111111'11.,. adzkl bean, P al/qlllcllll->. soybean, GII/ellle 1/1 a I, and broad bean. VICW IIJepmtment of PIRnt Pl<l(eC(H,n, '-;,uthwe,t '\gncultuml UnlveNtv. Ch()ngqmg 400716 ChmR ioba are cultivated m southwest Chma mostly for the edible seeds, wlnch serve as an Important source of protem m the human diet Damage to legume seeds m storage by the Cal/o;,oblllc!W," clunensu. constitutes a major constramt on toad availability The biology of CaI/OI->Oblllc!lIti> (/11111'1/',/;' has been studied by several researchers m Chma (Huan J ianguo , 1980, Zhang Shoudong , 1986) However, the essential information on the population dynamics of Col/owbl Uc!III;" dynamics m Southwest Chma IS lackmg The development of a sound pest management program must be based on a thorough understanding of the biology and ecology of the pest This article repoi ts the effects of hosts on the development. reproduction, and population dynamics of C{ll/osobmc!lIli> (/11111'11;'1,' Material and Methods Chmese cowpea weevil source and Host The weevil adults were collected hom seeds of P allgul((/ /.;, m Berber, Chongqmg P R China The ensuing stock colony was maintamed m mung beans wluch was stenlized With C0 60 - y ray m glass Jar m the laboratory (32l, and 75'7c r h ) After"'" 10 generations. the adult beetle trom the stock colony was used for the tests All the tests were conducted m the Petn dishes (12 cm diameters) The adult weevtls tram the stock colony were collected and moculated on Mungbean, Plwseolll,., all 1'1'11;' , adzkl bean, P allgulwl;" soybean, GII/ellle /)IU.!, and broad bean. V/.CIU {ubu seeds to oVlposlte at 30°C Three Petn dishes were prepared for total 150 beans m WlllCheach beans was only kept 1 egg on seed surface at each host seed After adult emelged, the longeVity and fertility were measured Results Development and SurVivorship of Inmmtures Developmental tune for the Immature stages on the four host plants IS plesented m Table 1 There wele slgmflcant differences m length at tune from egg to adult emergence among the populatIOns on different host seeds IndlVlduals fed on adzkt bean seeds developed slgmflcantly faster than those on any other host seeds dunng the Immature stages In contrast. the mdlvlduals fed on soybean seeds had a slgmhcantl longer time ( = 36 8 days) from the eggs to adult emergence than 107