71 



soap and water solution. Ten birds with five different levels of field- 

 estimated mite populations were washed and the mites counted in the 

 laboratory. The field estimations, the laboratory estimations, the 

 ratios between the two, and the mean of the ratios are shown below: 



Field 



Laboratory 



Lab Est. 



Est i mat ion 



Est imat ion 



Field Est. 



100 



2710 



27.10 



500 



2895 



5.79 



1000 



5065 



5.07 



2500 



V/35 



1.90 



5000 



4050 



0.81 



x = 8.13 

 The mean of the ratios between the laboratory estimate and the 

 field estimate was used as the correction factor. Field estimates 

 were multiplied by 8.13 to arrive at a corrected field estimate. 

 Unless otherwise stated, mite values referred to in the text are 

 field-estimated values. Converted values are for reference only. 



Field Application of Acaricides to Caged Hens 



TM 



Acaricides were applied to caged hens with B.S G. cans and a 



Sears 7-7"! pressure sprayer. Nozzles on both types of sprayers were 

 adjusted to emit cones ca. 15 cm wide when nozzles were held 31 to 

 k6 cm below the cages. Acaricides were applied from beneath the cages 

 in an effort to thoroughly soak the vent areas of the chickens. When- 

 ever possible, applicators stood on the side of the cages opposite the 

 feed trough to give then an unobstructed view of the hens while applying 

 the acaricides. 



Acaricides were mixed and applied according to directions found 

 i r. the Insect Control Guide (FAES) . Sprayers were cleaned thoroughly 

 between treatments. 



