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Laboratory experiments were conducted in Economic Entomology Department, Faculty of Agriculture, Mansoura University to estimate the heat requirements for Aphis nerii Boyer de Fonscolombe. attacking oleander shrubs at Mansoura district and its predator Cydonia vicina isis Muls. The results assured that, the lower development threshold for the nymphal stage was 13.11 oC , and the thermal units expressed as degree-days (dd's) required for nymphal stage were 98.53, 95.12 and 102.74 (dd's) at 20oC, 25oC and 28oC, respectively and the adult stages needed about 129.92, 140.66 and 153.27 daydegrees to complete their development on the three tested degree temperatures, respectively. The results indicated that the lower development threshold of the adults s were 12 0 C, 14 0 C for male and female, respectively and the degree day's at 20 0 C, 25 0 C and 28 0 C, were 538.4, 721.6 and 609.6 for male and 467.4, 610.5, and 565.6 for female.

THERMAL REQUIREMENTS FOR DEVELOPMENT OF Aphis nerii BOYER DE FONSCOLOMBE AND ITS PREDATOR Cydonia vicina isis MULS.