137 



the Kramer groves. These groves are maintained in an attempt to 

 support these colonies for future use. 



Future use of the snail easily could lend itself to the door- 

 yard citriculturist. Here the homeowner could stock a few mature 

 citrus trees with the seeds for a snail colony and practice the 

 necessary cultural measures to maintain the colony. The author be- 

 lieves that dooryard citrus is the only avenue for future snail usage. 

 Only with the total removal of chemical acaricides would there be 

 sufficient interest generated to reactivate use of D^. dormani for 

 commercial use. 



A citrus rust mite monitoring method was developed using a 

 rubber stamp to identify the field of view as one square centimeter. 

 Fruit diameter, circumference, and volume were used to extrapolate 

 citrus rust mite counts along the equatorial belt of the fruit to 

 entire populations per citrus fruit. These extrapolations corres- 

 ponded to the alcohol wash technique, indicating that a representa- 

 tive sample of rust mites could be found along the equatorial belt. 

 The distribution of P^. oleivora on the equatorial belt of the Valen- 

 cia orange was determined to be associated with the marginal (semi- 

 shaded) areas, supporting Watson and Berger (1937) who found russet 

 damage corresponding to these areas. 



The acaricidal tests of 1975 rated PP199 at .02%, PP199 at 

 .04%, and dicofol at .03% as the best effective chemicals over the six 

 week period for citrus rust mite control. Oxamyl at .001%, PP199 

 at .005%, and PP067 at .02% were rated as moderately effective chemi- 

 cals while PP067 at .01, PP199 at .02%, and PP067 at .04% were least 

 effective at 6 weeks post-treatment. From the results of this test. 



