A descriptive experimental study was carried out to have a birdeyeviewontheeffectofthesyrupmadefromleavesofAzadirachta (Margosa) indica A. Juss(Neem) on the control ofthe caterpillar (Trichoplusia ni) in cabbage seedlings, and the plotmethod was applied to the samples of 250 seedlings. The trial wascarried out between January and May 2022 and a RandomizedCompleteBlockDesign(RCBDwasused,with4treatmen ts,making a total of 15 experimental units (plots). The area wasdivided into 3 randomized blocks and each block with 5 plotswhere the sowing was carried out in lines with a 15 cm compassbetween lines in the same plot and the seeds were released withineach line, without having a space between the seeds within thelines once dealing with a nest. Three parameters were evaluated,Population density, Infestation level and Medium attack level.The collected data were submitted to statistical processing using(SISVAR 5.6) and analysis of variance and Tukey's test at 5% ofsignificance, however, significant differences were found for theparameters degree of infestation (GI) and number of caterpillars(NL)relatedtothepercentageofcaterpillarmortalitywhens ubmittedto differentdoses ofNeemextractapplication.