الفهرس 
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Abstract
a) The aim of this thesis was to assess the impact of agricultural activities and practices such as: - habitat selection, kinds of crops, irrigation methods, kind of soils, use of fertilizers and pesticides…etc, on the abundance of some vectors that have a public health and economic importance to both Man and animal. The vectors chosen were rodents, snails, mosquitoes, and flies. This study was performed in both the old conventional land (OCL), in the Sabahyia location and Merza location (SL & ML), and the newly reclaimed land (NRL), in the Nahda location (NL), in several sites in the agricultural fields and activities. The results accomplished revealed that different situations and conditions, when fulfilled in these sites, lead to the increase or decrease in vectors’ abundance. These situations or conditions are presented in a descending order according to those more preferred by the vector as follows: 1. Rodents: Two techniques were used in this case: census-baiting technique to calculate the rodents’ abundance in the agricultural fields, and live-traps technique to identify the rodents’ species in these fields and their abundance in the poultry houses investigated. Four species were detected in both of the agricultural fields and activities investigated in the period of this study. The results achieved showed that each species reacted differently in its environment depending on different aspects: the location of the activity, the season of the year, the agricultural practices or activities applied in the location