Experiments were conducted in the laboratory and in greenhouses. Of three neem preparations sprayed upon eggs, only neem oil (NO) exerted a negative impact on the hatching rate of Coccinella septempunctata and Chrysoperla carnea. First instar larvae of Episyrphus balteatus proved to be highly susceptible, when feeding 24 h on aphids sprayed with neem kernel water extract (NKWE). First instar larvae of C. septempunctata showed a very high mortality when feeding on aphids sprayed with different neem preparations. Aphid feeding and live span was reduced. When NKWE had been applied to the soil, the mortality of larvae of E. balteatus and C. septempunctata were lower, when feeding on aphids. Second instar larvae of C. septempunctata were far less susceptible when feeding 48 h on neem-sprayed aphids than first instars; the time of their development was prolonged, and aphid consumption reduced. Larvae of C. carnea proved to be less susceptible, when feeding on neem-sprayed aphids, than E. balteatus and C. septempunctata. In C. carnea, however, significant influences were also observed in aphid consumption, time of development, mortality, longevity, and rate of deformity. NO, containing a very low concentration of azadirachtin A, had stronger negative effects than NeemAzal-T/S[registered trademark], in all observations. In the parasitoid Diaeretiella rapae, NKWE application to the soil induced negative reactions, when aphids on these plants were parasitized: low percentage parasitization, lowered mummy weight, low emergence rate of adults of F1 and even of F2. Foliar sprays of NKWE had less severe effects in this parasitoid species. The results are discussed with regard to their theoretical and practical significance. Biometrics; Nutrition; Diet; Prey; Life cycle and development; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts; Ecology; Population dynamics; Predators; Abiotic factors; Chemical factors Chrysoperla carnea (Neuroptera ); Coccinella septempunctata (Coccinellidae ); Episyrphus balteatus (Syrphidae ); Insect prey; Aphidoidea (Hemiptera); Feeding on neem treated prey effects on development, consumption rate, longevity & mortality; Feeding rate; Hemipteran prey; Development; Mortality; Fertilizers and pesticides; Neem Diaeretiella rapae (Aphidiidae); Weight; Hemipteran hosts; Aphidoidea; Neem treated hosts effects on prevalence, mummy weight & emergence rates; Survival; Fertilizers and pesticides; Neem Aphidoidea; Hymenopteran parasites; Diaeretiella rapae; Neem treatment effects on parasite prevalence, weight & emergence rate; Insect predators; Coleoptera; Diptera & Neuroptera; Neem treatment effects on predator development, consumption rate & mortality; Fertilizers and pesticides; Neem none