G.J.B.A.H.S.,Vol.3(3):148-157 Variation of sex-ratio and minuta uhmann, the main Mondjeli Constantin (1,2) , Ntsom Georges Fra (2) Institute of Agricultural Research for D (3) Institute of Agric (4) Depar Abstract The optimal production of oil infestations by the leaflet miner (Co treatment of young and adult palms control methods. This study was car control against this pest. Fisher bloc subdivided into 3 levels. The results s revealed that natural enemies or pred order Hymenoptera. These results can Key words: Coelaenomenodera minuta, 1. Introduction The oil palm is a perennial oil Graminae (Bernal, 1997). It originate about 15º latitude North and South botanist Jacquin as Elaeis guineensis, gulf of Guinea. Evidence in favor of t and particularly on the discovery (Elaeis guineensis Jacq.) commonly c located in the heart of the crown on th of oleaginous plants which present a s oil palm production or yield is don nowadays results from crosses of (Jacquemard et al., 1997). Tenera c Malaysia and Indonesia are currently at 85.42 per cent in 2001 (Corley, 200 When grown industrially as mon times more oil per hectare, or 6 tons o (IRHO, 1991; Selabie, 1999). Palm o dietary fat and vitamins (IRHO, 1991 in the form of margarine or basic vege manufacture of candles, lubricants, g palm kernel is used in the compositio fibers and the cake of palm kernels are active charcoal (Pantzaris, 1988). In Cameroon, oil palm cultivatio administrative regions of the South-w occupy about 43,300 ha against 60 approximately 50,000 tons of fresh fru rest is processed locally (Anonymou estimated at 119,000 tons produced by on one hand and a few smallholder production of palm oil remains insuff tons, needed by the processing industr would be significantly greater if oil p pests and diseases. In Africa, as els economic impact of these pests varie (July-September, 2014) 148 d identification of natural enemies o n pest of Elaeis guineensis Jacq. in the of Cameroon mboh-Ntsefong Godswill (2)* , Ajambang-Nchu Wal ank 2 , Baleba Laurent Justinien (3) , Amah-Parh Igna (1) Bogor Agricultural University, Indonesia Development (IRAD), Specialized Centre for Oil Palm Resea Douala, Cameroon cultural Research for Development (IRAD), Barombi Kang, rtment of plant protection, University of Dschang, Cameroon * Corresponding Author palm (Elaeis guineensis Jacq.) is usually limited by oelaenomenodera minuta) of this crop can cause abo against the pest is not totally satisfactory, hence th rried out on young and mature palms in the perspec cks were applied as experimental design and monitori show that the sex ratio of C. minuta is one female to 0. dators of C. minuta belong to four genera of the order n be exploited in the development of control measures sex-ratio, Elaeis guineensis Jacq., oil palm pest control, natu crop of the Arecacae family which is the second lar ed from Africa along the Gulf of Guinea. In relation to h (Surre and Ziller, 1963 cit. Pouvreau, 1984). The taxonomically indicating the place where it was disc the African origin of the oil palm is based on the desc y of fossil pollen in Nigeria (Zeven, 1965 cit. called African oil palm is a monoecious tree plant he stipe (IRHO, 1991; Anonymous, 1995; Jacquemard significant economic interest for producer countries (IR ne genetically. In fact, the hybrid Tenera which is f two other varieties of agronomic interest: Dur contributes about 27% of the world’s production of the best producers of this vegetable oil at the global sc 03). noculture in ecologically favorable areas, the fruits of of oil per hectare compared to other oilseed crops suc oil which is obtained from the mesocarp of the fruit 1). About 80% of palm oil produced in the world is us etable fats (Blaak, 1976). The other 20% are used for glycerol and fatty acids and other cosmetic products. P on of pharmaceutical products, inks, and pastries (Pan e used as feed for livestock while the hulls of fruits are on has been practiced by the agro industries and smallh west, littoral, the center and south (Fanguin, 1978; Ano 0,785 ha of land by the industrial sector and sup uit bunches (FFB) per year; or 10 000 tons of crude p us, 2003). By 1998, the average annual production o y the agro-industrial companies (CDC, SOCAPALM, palm plantations on the other hand (Bernard et al., ficient because it does not cover the national annual n ry and for local consumption (Anonymous, 2003). Ho palm cultivation was not confronted with phytosanita sewhere in the world, oil palm groves host a high d es from one region to another and according to the ta ISSN: 2319 – 5584 of Cœlaenomenodera e South-west region lter (1,2) , Ngando-Ebongue atius (4) arch (CEREPAH) of La Dibamba, , Cameroun n y pests and diseases. Severe out 50% yield loss. Chemical he need to develop alternative ctive of developing integrated ing was done on palm crowns .6 male (1:0.6). The study also r Araneae and 6 genera of the against the pest. ural enemies, Cameroon. rgest group of plants after the o the equator, this crop extends oil palm was named by the covered for the first time – the criptions of botanists, travelers Cao, 1995). The oil palm with a single vegetative bud d, 1995). It is part of the group RHO, 1991). Improvement of the most popularized variety ra female and Pisifera male f vegetable oils (Fold, 2003). cale with production estimated f E. Guineensis produce 5 to 7 ch as soybeans and groundnuts is one of the main sources of sed for everyday consumption, the production of soap, paints, Palm kernel oil obtained from ntzaris, 1988; Cao, 1995). The e used in the manufacturing of holders over the decades in the onymous, 2003). Smallholders ply the industrial mills with palm oil (CPO), meanwhile the of palm oil in Cameroon was , SPFS, PAMOL, SAFACAM) , 1998). This annual national needs valued at about 200 000 owever, the annual production ary pressures due primarily to diversity of insect pests. The xa. The major pests belong to