The black cutworm, Agrotis ipsilon (Hufnagel) is the major seedling pests of several economic plants, the forth instar larva is the most damaged stage reaching up to 80 % of yield depending on severity of infestation. 1- Ecological studies on black cutworm A. ipsilon: ecological studies were carried out on A. ipsilon depending on simple correlation and regression between pest population and its seasonal dynamics along two successive seasons 2018/2019 and 2019/2020. The study depending on collecting insects in tested area by light trap which has been fixed at Experimental Station of Agricultural Research, at Sers Ellyan city, Menoufia governorate 2- Biological studies on black cutworm A. ipsilon under laboratory condition on two different hosts, sugar beet leaves and Egyptian clover to study effects of these hosts on survival and longevity in black cutworm A. ipsilon Larvae. 3- Recorded a new facultative parasitoid on black cutworm A. ipsilon during the rearing of black cutworm, A. ipsilon under the laboratory condition pupae of A. ipsilon were destruction. Adults of flies were observed moving into glass jars which covered with piece of muslin. When destruction pupae were examined small and whit larvae were observed moving in the pupa. The small white larvae were collected in glass vials and sent to the laboratory of Insect Taxonomy Department, Plant Protection Research Institute for identification. 4- Evaluation of Daflla plant extract against the black cutworm larvae under laboratory condition This experiment was carried out as bait trap treatment. Neriumoleander (Daflla) extract was prepared by grounding the shade drying leaves into fine powder with an electric blender mill, then 50 g of a fine dried powder was extracted with 500 ml of 70 % ethanol as a solvent for ten days. The mixture was filtered through filter paper and evaporated to dryness under vacuum using a rotatory vacuum evaporator to have the semi-solid crude. The experiment was conducted to determine the efficacy of the Nerium oleander leaves extract against 4th larvae instar of A. ipsilon. Three concentration (1000, 2000 and 3000 ppm) were prepared and mixed with bran to make a suitable attractive bait trap for A. ipsilon larvae. 5- Evaluation of some bio fertilizers containing Entomopathogenic bacteria as a bait trap against the 4th instar larvae of A. ipsilon microbial fertilizers contain three species of microbial organism. These microbial fertilizers were mixed together in equal ratios and their activity was evaluated against the A. ipsilon larvae depending on using bait trap for controlling A. ipsilon larvae 6- Evaluation of a methylenedianiline derivative as an insecticide against fourth-instar larvae, under laboratory conditions, where four concentrations (25, 50, 100, and 200 ppm) of 4,4-methylenedianiline derivative (MDAd) were made, and castor leaves were immersed in the concentrations. 3 replications were made for each concentration. After the larvae were treated with the previous concentrations, the death rate was observed among the experimental larvae every 24 hours. The percentage of larval death was calculated for each concentration and the LC50 and LC90 values were calculated using the LDP-Line program.