67 



Following a 6-hr exposure period, each bait and station was placed 

 into a plastic bag, returned to the laboratory, and the catch processed 

 by sex. 



When testing was done at the University of Florida Thoroughbred 

 Unit at Ocala, Florida, bait stations were spaced along the edge of the 

 concrete center aisle of a horse barn and each was secured with a rock. 



After a 24-hr exposure period, baits and stations were collected 

 and processed as above. 

 Application of Contact Residuals to Selected Surfaces 



Templates of plywood, cement block, and galvinized tin were selected 

 for use in residual tests because these are the types of surfaces most 

 likely to be sprayed with a contact residual in poultry houses. 



All templates were cleaned with soap and water and allowed to air 

 dry prior to treatment. Pesticides were applied to run-off with a hand- 

 held trigger-action sprayer. The first test began as soon as the 

 templates had dried. 



Another method for testing residuals by use of blotting paper 

 templates is described by Batth (1974). 

 Application of Contact Residuals to Plywood Panels 



Panels, 61 by 122 by 0.6 cm, were cut from 1.2 by 2.4 m plywood 

 sheets and designed to hang with the long side in a horizontal position. 

 Panels were hung by attaching two 46-cm lengths of light-weight chain 

 to the upper corners. Aluminum rain gutters, for catching insects 

 killed while on the panels, were placed horizontally along both sides 

 of each panel so that the bottom of the guttering was even with the 

 lower edge of the panel (Figure 7). 



