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This picture shows the type of protective kaolin clay deposit that is
necessary to provide complete protection of foliage and fruit in the OFP
treatment. In 2004, a wet year, it was difficult to maintain the necessary
protective film of kaolin clay on trees in the organic system and eleven
applications were needed; however, only four kaolin applications were needed
in 2005. One of the weaknesses of the organic system appears to be the cost
of the multiple applications needed to maintain the coverage of kaolin and
the negative effects of the kaolin on predacious mites. Further
experimentation with application rates and timing in 2006 should help to
determine the appropriate use of this material.
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