94 



Four blocks (rows) of trees were selected with one row spacing 

 between blocks. Single tree treatments were assigned randomly within 

 the blocks, with an unsprayed buffer tree between treatments. Applica- 

 tion was with a 30 gallon, water agitated spray tank. A hand held 

 nozzle was used to spray to run off at 200 p.s.i. Spray solutions were 

 premixed earlier that day and stored in two gallon stainless steel 

 canisters. The spray tank was rinsed with water between the different 

 treatments. 



Counts were made at pre-treatment (day of application), then at 

 weekly intervals for six weeks. All treatments were sampled by loca- 

 ting an orange on each of the four major compass headings (N, E, S, W). 

 Each orange was then marked with a rubber stamp at four points along 

 the equatorial belt of the fruit corresponding to N, E, S, W quadrants. 



A lOX Bausch & Lomb hand lens was used to count the number of citrus 



2 

 rust mites per 1 cm area. 



1976 field acaricide spray tests . The 1976 field acaricide tests 

 were evaluated at the same grove site, using the same block (rows) as 

 in the 1975 test (see 1975 tests). Blocks were set up in an east- 

 west orientation with a buffer row between blocks. Eight trees for 

 evaluation per block were identified as having more than 60% mite 

 infestation per ten random cm"^ observations on fruit per tree. As 

 eight trees were identified, with at least one tree buffer within the 

 block, treatments were randomly assigned with each tree being sprayed 

 to run off. 



The chemicals evaluated in the 1976 acaricide test are as follows: 



PP199 .01, .02, .04% 



Banex'^ 1.6% 



