114 



Duncan tests were conducted on the treatments for weeks 2, 3, and 

 6 (Tables 27, 28, 29, respectively). Results of these tests indicated 

 the (treatment 5) PP067 at .01% was significantly less effective than 

 the other chemicals. At week 2 no other chemical treatment began 

 to lose effectiveness (Figure 34; Table 27). 



The Duncan test for week 3 showed oxamyl (treatment 9) as not 

 being significantly different from (treatment 6) PP067 at .02% (Table 

 28). These two chemicals began losing their effectiveness during the 

 3rd week. PP067 at .01% ranked very close to oxamyl and PP067 at 

 .02%, but proved statistically better than oxamyl. 



During weeks 4 and 5 a naturally occurring population decline 

 suppressed the mite population so that no differences within 

 the treatments were statistically discernable. 



For week 6 the Duncan test basically divided the chemicals into 

 three divisions; least, moderate, and best control. Because the 

 treatments were not analyzed as to actual damage to the fruit, it would 

 be unrealistic to designate any of the treatments poor or good, but 

 rather the terms least control and best control were used. 



Those chemicals belonging to the least control group for week 6 

 were PP067 at .01%, PP199 at .01%, and PP067 at .04% level. These 

 chemicals gave the least control of the citrus rust mites (Table 29). 



The second group of chemicals in the moderate region were as 

 follows: oxamyl at .001%, PP067 at .02%, and PP199 at .005% level. The 

 Duncan test was not sensitive enough to place these chemicals into the 

 other categories. Because of this ambivalence the author hestitates 

 to recommend these for use. 



The final group includes PP199 at .02%, dicofol at .03%, and 



