Naled or Dibrom, also commonly used, is an organic phosphate chemical which
 is also insecticidal and thus may also serve for aphid or pamera control. Like
 dicofol, some populations of mites are tolerant of its use and only low mortality
 results.

 Omite, a sulfone chemical compound, is now widely used and appears more effec-
 tive than either of the two older materials above. There is no evidence of resis-
 tance to Omite in spidermites but in a few cases control has been less than that
 desired. One of the great advantages of Omite is its safety to mammals and birds
 and to beneficial or predaceous mite species.

 Plictran, an organotin compound, is a recent introduction which in tests has
 been a most potent chemical for spidermite control at 0.25-0.5 lb. ai/A. It is
 now labeled for use and should be available. A similar compound, Vendex, is soon
 to be registered also for mite control on strawberries.

 In view of the hazard and destructiveness of parathion to beneficial organisms
 and lack of effect on mites its use should be limited to extreme cases where no
 other material is available.

 With four different types of Chemical toxicants available the choice of the
 right one depends upon effectiveness. When one material is used exclusively,
 mites soon are unaffected by it, therefore, alternate use of the compounds from
 the classes mentioned should provide adequate mite control. Each chemical has some
 disadvantages, all may cause some fruit or foliage injury, formulations may not mix
 well or powdery residues nay persist on the fruit. These things should be weighed
 to make a choice of the right material for a given situation.

 4. Right time this is perhaps the most critical of the 4 R's in some ways.
 Mites are not always vulnerable to acaricides and in many cases the damage has been
 caused before they are noticed. For this reason a good detection system should be
 in operation routinely and when inspections reveal the presence of mites, begin a
 treatment to eradicate the "hot spots" or local areas in a field with mites. Timing
 is also important to avoid injury and to allow for tolerance before harvest.

 B. Integrated Controls and Managment
 A second approach to mite control is through integrating the best known prac-
tices to retard mite damage. This approach could involve the use of more tolerant
varieties, such as 'Apollo' or 'Sequoia'; however, these varieties appear to be
inferior to 'Tioga' in yield and earliness. Development of an early bearing
variety with mite tolerance would make this initial step a reality.

 Mite populations may be controlled by other mites which feed on their eggs and
young. These predators, when released along the guidelines for use of chemicals
could be most important to control.

 1. Right Way Release of predators should be made as needed and on plants
with spider mites present. If no host mites are present the predators soon starve
and are lost.

 2. Right Humber The number of predators released may depend upon the
number of spider mites present on the foliage. Release of predators to form a
ratio of from 3:1 to 5:1 prey to predator seem adequate at the present time. Large
populations of spider mites could be lowered with chemical treatment to reduce
the numbers of predators needed. Concurrent release of prey and predator is prac-
ticed with some crops and might be feasible with strawberries.