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<br />. <br /> <br />ABSTRACT <br /> <br />A workshop group of six scientists evaluated the possible indirect <br />and direct effects of a weather modification pilot project on the <br />major forest insects and diseases of the American River Basin in <br />California. Indirect effects include the possible changes in host <br />condition as a result of impact on the host and the host's environ- <br />ment. Direct effects include effects associated with the direct <br />sensitivity of pathogens and insects to temperature and moisture <br />changes. The group proposes research and monitoring needs and con- <br />cludes that the proposed pilot program with an average 10- to <br />IS-percent increase in precipitation over the life of the project <br />will not have any major impact upon forest insects and diseases. <br />Minor, beneficial effects are expected to occur as a result of <br />decreased drought stress on plants. <br /> <br />I-I <br />