Maize and Sorghum are the most important food crops in Ethiopia. However, stemrnborers became the major problem resulting in yield losses. A study was conducted inrnthe cenh'al Rift valley of Ethiopia to find out stem borers infestation, diversity andrntheir parasitoids interaction, to determine the appropriate statistical model thatrnshould be used in the analysis of this sort of data. The analysis of stem borers andrntheir parasitoids in maize and sorghum agro-ecosystems was made by generalizedrnlinear model using data recorded from eastern Ethiopia in 1999 and 2000. In previousrnstudies, some researchers have used general linear Model (GLM) analysis on the stemrnborers' data.rnBut, general linear model is used for data satisfying assumption of normality where asrnthere are situations in which non-normal data is treated. This includes usingrngeneralized linear model analysis that allows the use of different exponentialrndistributions and non-linear link functions. Furthermore, generalized linear modelrnwas found to be relatively better than general linear model for the analysis of datarnwhich violate the assumption of linearity and normality. Moreover, the responsernvariables: infestation and diversity of stem borers were found to be discrete andrncounts. The analysis of the data using this model and appropriate link functions isrnapplied to identify the significant predictors which contribute positively or negativelyrnto the diversity and infestation of stem borers among the explanatory variables.rnAccordingly, generalized linear model was found to be the best model in identifyingrnthe significant predictors. Consequently, infestation and diversity of stem borers werernnot significantly affected by the season, wild host and the predator species. It was alsornobserved that the infestation was not affected by cropping systems where as therndiversity is not affected by year, pest species and crop growth stages. Mean separationrnwas made by using LSD and Duncan's multiple range tests to see the differences withrnin the explanatory variables. There fore, the effects of vegetation types across locationsrnon the infestation and diversity of stem borers is not significantly different fromrndistrict to districts at 95% confidence. Besides, there is no significant difference ofinfestation of stem borers with or with out the wild hosts where as diversity does notrndiffer significantly for the main crops (sorghum or maize), cropping systems (mixedrnor sale), for the parasitoid species (presence or absence) and for the nitrogen contents.rnBut, there is significant difference in infestation of stem borers between the years, 1999rnand 2000, between the main crops, more for sorghum (47.812) than maize (19.775),rnwith in the pests species which high for the key species (44.867) than other speciesrn(18.639), with in the growth stages of the crops in which more infestation was measurerna during the stubble stage (55.00) followed by maturity stage (43.463) the vegetativernstage (29.683) at 95% level of significance. The presence of the parasitoids speciesrnresulted in more infestation than its absence. The interaction effects of year andrnlocation basically implies the difference of infestation and diversity of stem borers inrnthe years 1999 and 2000 across the locations. This is due to the fact that differentrnlocations have specific determinant factors such as temperature, altitude and rain fallrnand etc. which are not included in this study.rnFinally, it is recommended that generalized linear model is flexible, easy to use for anyrntype of data, due attention should be given to the highly infested areas, control shouldrnbe devised for the stem borers and great care should be given for the parasitoidsrnduring the use of chemicals.