Development of a Control Strategy

The Kavala plain was initially divided into four different types of environment, reflecting different abatement approaches: natural, agricultural, peri-urban and urban. In each, preliminary inspections were undertaken to determine all potential breeding sites. Then, permanent larval sampling sites were set up, which were sampled on a weekly basis. A total of 1235 sampling sites were established and checked weekly: 311 in the natural environment, 818 on agricultural land and 106 in the peri-urban system. In the urban environment, and after having checked 2320 private properties, 1096 potential breeding sites were recorded the majority of which (737) were open cesspools. In addition, educational leaflets were distributed to local people with information on how to restrict mosquito breeding on their own properties and complaints of mosquito nuisance were recorded. Buffer zones were drawn on a general map of the area around each village at distances of 1.5, 3 and 4.5 kilometres. These buffer zones helped to set spraying priorities which largely depend on the dispersal abilities of the main mosquito genera in the application area (Fig. 3).

Figure 4. Example of a digitized orthophoto map that indicates all potential breeding sites in an urban system.

All potential breeding sites were mapped and digitized on orthophotomaps using ArcGIS® 8.3. Twenty three maps were then developed: six maps at a scale of 1:15 000 for the natural system, four maps at a scale of 1:30 000 for the agricultural system, four maps at a scale of 1:20 000 for the peri-urban system and nine maps at a scale of 1:5000 for the urban system (Fig. 4). These maps were distributed to both air and ground personnel as operational working documents.

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