Résumé
Some biological aspects and life table of the oat bird-cherry aphid, Rhopalosiphum padi L. feed on wheat [Sids 1] were studied at constant temperatures of 18°+/-2, 22°+/-2 and 26+/-2°C. At a given temperatures, the time needed for the development of nymphal instars decreased significantly with the increase in temperatures
The longest period was recorded at 18+/-2°C while the shortest one was found at 26+/-2°C
The calculated developmental threshold [tO] of the whole nymphal stage was estimated as 12.66°C. The thermal units needed for the development of the whole nymphal stage of the oat aphid were 67.95 day-degrees
Generation time [GT], reproductive potential [RO], population-doubling time [DT], intrinsic [rm] and finite rate [X] of increase of the pest were also computed and discussed. Based on the obtained data, temperatures of 22°+/-2 and 26+/-2°C were the most suitable temperatures for the development and multiplication of the oat aphid