author(s)
Eman A Shehata

abstract
The aim of this research is to determine the impacts of some climatic factors and plant age on the population density of the cotton aphid, Aphis gossypii (Glov.) on tomato plants. Field experiments were conducted at Mansoura district, Dakhlia Governorate, Egypt, during two successive growing seasons (2018/2019 and 2019/2020) to study the population density of A. gossypii (Glov.) (Hemiptera: Aphididae) on tomato plants (Hybrid T4 84 cultivar). Results indicated that A. gossypii infested tomato plants from beginning of October to mid-January during the two growing seasons. The cumulative counts of A. gossypii were 523.79 and 533.06 individuals per season for the two growing seasons, respectively. The total mean of A. gossypii population through the whole season was 65.47 ± 4.61 and 66.63 ± 3.86 individuals per five plants over the first and second growing seasons, respectively.