A descriptive experimental study was carried out to have a bird eye view on the effect of the syrup made from leaves of Azadirachta (Margosa) indica A. Juss (Neem) on the control of the caterpillar (Trichoplusia ni) in cabbage seedlings, and the plot method was applied to the samples of 250 seedlings. The trial was carried out between January and May 2022 and a Randomized Complete Block Design (RCBD was used, with 4 treatments, making a total of 15 experimental units (plots). The area was divided into 3 randomized blocks and each block with 5 plots where the sowing was carried out in lines with a 15 cm compass between lines in the same plot and the seeds were released within each line, without having a space between the seeds within the lines 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% of significance, however, significant differences were found for the parameters degree of infestation (GI) and number of caterpillars (NL) related to the percentage of caterpillar mortality when submitted to different doses of Neem extract application.