Abstract

The study was conducted to identify the extent of the effect of the concentrations of the crude secondary compounds (alkaloids and phenolics) of the leaves of the plants under study on the percentage of death of the American cockroach eggs. If the alkaloids extract of the thistle plant recorded a clear superiority over the alkaloids extract of the thistle plant, it was noted that the thistle plant was superior to all extracts and at all concentrations over the thistle plant. We also note the direct relationship between the concentrations of the extracts and the percentage of non-cumulative death, as the percentage of death increases with increasing the concentration of the extract, as the concentration of 200 ppm gave the highest percentage of death for all tested plants.
The two plants recorded the effect of the concentrations of the crude secondary compounds (alkaloids and phenolics), respectively, of the leaves of the plants under study on the percentage of death of the early nymph of the American cockroach, as it was noted that the alkaloids extract of the thistle plant was clearly superior to the alkaloids extract of the thistle plant. It was also noted that the alkaloid extract in the thistle plant was superior to the rest of the extracts of the same plant, and it was noted that the plant was superior.