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<br />e <br /> <br />e <br /> <br />"2. For the same reason, root and butt decay (F. annosus) <br />in fir will have less impact because fir growth-wi I I keep <br />ahead of the pathogen. <br /> <br />"3. Tipmoth on eastside pine would be less severe due to <br />increased growth of the pine. <br /> <br />"4. Under augmented water supplies, a decrease in losses <br />from the pine reproduction weevil, Cylindrolopturus <br />eatoni, may be expected as a result of the lessened <br />drought stress. <br /> <br />liThe workshop group be I i eves the norma I insect and disease <br />monitoring will serve little purpose, since so many factors <br />other than precipitation augmentation can influence the <br />success of disease and insect attacks. Therefore, the most <br />effective monitoring and research program would be one that <br />concentrates on determining: (1) the success of the augmen- <br />tation, (2) the effect upon snowpacks under various environ- <br />mental complexes, and (3) the effects of different climatic <br />influences upon insect and disease incidence. <br /> <br />"Item 3 is a research recommendation that goes beyond the <br />impact of weather modification. It involves the basic <br />impact of all forms of climatic influence upon forest <br />diseases and insects. This encompasses microclimatic <br />influences whiCh occur as a result of forest fires, the <br />creation of openings in forest stands due to natural causes, <br />forest harvest operations, grazing by wildlife and domestic <br />stock, and any other change to the climatic and cover <br />conditions existing at any point in time and space.1I [15, <br />pp. 1-31 to I-34J <br /> <br />The Sierra Cooperative Pilot Project Environmental Assessment states: <br /> <br />"With regard to precipitation, it is generally believed that <br />the average annual rainfal I is the basis for the species <br />composition of an area; and that it is the end of the curve <br />(the drought or below-average situation) that determines <br />whether a given species will continue in an area. Shifts in <br />moisture throuah the middle ranae of moisture availaoilitv <br />will affect growth and biomas5,~but do not have a controliing <br />impact on compOSition of the plant ccmmunity. <br /> <br />lilt would require a significant increase in moisture supply <br />over a middle- to long-term periOd in order that competing <br />plants would invade an area and push existing species <br />cut. <br /> <br />IISma11 shifts in species may occur due ~J late-lying snOWOdnKS <br />at small, localized sites if the wind and other snow-depositing <br />controls extend the same snowbank each season auring an <br /> <br />1 .- <br />_0 <br />