However, in any area where reproduction is continuous and dominated by migratory species, the use of aerosols alone is satisfactory only if done on a repetitive basis. When properly applied, aerosols do not leave dangerous or unsightly deposits. Where reinfestation is not a problem, such as in less populated areas, insecticide application by means of a mist blower may provide satisfactory control. Aerosol operations should be accomplished when wind speeds are less than 6 knots and when a temperature inversion is present. Since aerosol applications are most effective against flying insects, they should be accomplished when the target species are active.
Residual sprays have a limited exterior applicability for the protection of small camps.
When used, the spray is applied to all vegetation surfaces for an area of 30 meters or more around the place to be protected and to insect resting places within the bivouac area. Living quarters in permanent or semipermanent camps should be protected with 18 mesh screening. Where vector species are present, bed nets should be used as additional protection. Personal application type insect repellents are discussed in Article 8-47. In areas where disease bearing mosquitoes occur, zones outside the camp perimeter should be off-limits to all military personnel, except as required.