298 THE MOSQUITOES OF NEW JERSEY 



"B. Determine lengths and number of hose lines required. 



"C. Locate available water supply. A fire hydrant or large size 

 supply outlet is essential to avoid delay in filling tank. 



"D. Estimate time required to spray the area completely before 

 the arrival of guests. 



"E. Approximate the dilution of larvicide required. This will 

 depend on the density of mosquitoes at dusk. For severe in- 

 festations, a dilution of one part of emulsion to eleven parts 

 of water is recommended. On all other occasions a dilution 

 of 1—14! is satisfactory. 



APPLICATION 



"The following guide indicates the methods essential for the efficient 

 application of the larvicide as a repellent. 

 "1. Inside application: 



"A. Have the spraying equipment in position with all necessary 

 supplies at a time to permit a complete coverage of the en- 

 tire area before guests arrive. 

 "B. Compare weather conditions with those outlined in the plan 



of operation and make changes if required. 

 "C. Start spraying on the windward side of the area and, work- 

 ing from edge to edge, proceed to cover the entire area with 

 a mist of larvicide. Particular note should be made to spray 

 all trees, shrubs, sheds, and other mosquito hiding places. 

 When this operation is complete, all mosquitoes in the area 

 should have been killed. The fine white residue may be 

 brushed off the grass and low shrubs if required. 

 "2. Marginal hand application. After the inside or main area has 

 been sprayed the marginal band must be treated. The spray 

 should be directed away from the inside area both to kill and to 

 drive all mosquitoes away. It is wise to apply more larvicide 

 on the marginal band so that a repellent zone is set up completely 

 around the inside or main area. 

 "When mosquitoes are not numerous on the wing during the daylight 

 hours, such an application will provide protection for the entire eve- 

 ning when applied one to one and one-half hours before dusk. 



"It is well for the director to mingle with the guests near the wind- 

 ward side of the area before and at dusk. At the first appearance of in- 

 vading mosquitoes the sprayer should move across the windward side 

 rapidly setting up a high, well vaporized fog in the marginal band 

 which will repel all invading insects. The fog should then be maintained 



