A method to forecast the beginnings of damage by the black cutworm, Agrotis ipsilon (Hufn) to maize, cotton, clover, faba beans and vegetables was detected through 1993-1996 in Abu-homos District, Behaira Governorate. Life table parameters which were calculated to fit the accuracy of the method. As it appears the first and third generations have a moderate values of (r_m), and the second generation has a low (r_m) values. The (R_o) also decreased in the second generation and increased on the third one to be like the first one. These parameters are more sensitive to the change in developmental time, survival rates and fecundity than other life history components, which should be taken into consideration when a successful plans are to be proposed for management and control programs of this pest.