author(s)
Hanaa FH Shehata, Mohamed AA Abdel-Rahman, Ali MA Mahmoud and Ahmed MH Ali

abstract
Development, survival and reproductive potential of the greenbug aphid, S. graminum were studied at constant temperatures of 18°, 22° and 26 °C. At a given temperature, the developmental time decreased significantly with the increase in temperature. The longest period was recorded at 18 ºC and the shortest was at 26 ºC. The developmental threshold (t0) estimated as 10.37 ºC and the aphids required 103.72 day-degrees (DD) to complete the development of the whole nymphal stage. Generation time (GT), reproductive potential (R0), population doubling time (DT), intrinsic (rm) and finite rate of increase (λ) of the pest were also computed and discussed. Based on the obtained data, temperatures ranged from 22° to 26° were the most suitable for the development and multiplication of the greenbug aphid.