Studies on the relative importance of the three known species of cabbagernaphids (Brevicoryne brassicae (Linneaus), Myzus persicae (Sulz) and Upaphisrnerysimi (Kaltenbach)) and their parasitoid complex in Kenya were carried out.rnThe studies involved farmers' fields' surveys and interviews and also fieldrnexperiments conducted at the Jomo Kenyatta University of Agriculture andrntechnology (JKUAT) Research and Production Department land and in arnfarmer's field at Limuru. Gloria F1 hybrid was sown at JKUAT whilernCopenhagen Market variety was sown at Limuru.rnThe field experiments were conducted in a Completely Randomized BlockrnDesign (CRBD) involving three treatments and a control, with three repl icatesrneach. The treatments comprised of applications of: - Lambda-Cyhalothrinrn(Karate; Bacillus thuringiensis Berliner (Bt.) var. Kurstaki toxin (Dipel 2x) thatrnselectively kills Diamondback moth (DBM); A combination of the two pesticidesrn(Karate and Bt.) and Untreated controls. Parameters included; relat ivernabundance of the three species of aphids; their corresponding damage torncabbage; the number of mummies per sample; percent parasitism and thernproportions of the primary- and hyper-parasitoids hatched. The parasitoidrncomplex was constructed from the identified parasitoids.rnThe results showed aphid counts to be higher in non karate-treated plots thanrnin the karate-treated ones. More hyperparasitoids notably Alloxysta sp andrnPachyneuron sp. than the only primary parasitoid (Diaeratiella rapae) emergedrnfrom non karate-treated plots. This might suggest that karate might have thernadvantage of repelling hyperparasitoids or inhibiting their emergence. Yieldrnshowed some negative correlation with aphid infestations. A combinedrntreatment gave the best overall yield at both sites.