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<br />when moisture and temperature conditions are favorable for infec- <br />tion. Changes in the period of flushing could, therefore, affect <br />the coincidence of inoculum, favorable weather, and susceptible <br />tissue. Possible effects of such a change are unknown, but they <br />would probably be small, since early and late flushing are equally <br />likely during periods favorable and unfavorable for infection. <br />Early flushing increases the likelihood of frost damage to foliage, <br />and late shooting subjects new growth to the hazards of high tem- <br />peratures or excessive insolation. Thus, effects are largely <br />unpredictable. <br /> <br />A special project to monitor phonological effects seems unneces- <br />sary, but might fit into vegetative monitoring and could prove <br />useful in later correlations with disease or insect activity. <br /> <br />SoiZ moist~. - Increased precipitation may lead to elevation of <br />water tables, particularly in the flat terrain around lakes and <br />meadows. Lodgepole pine in these sites are often killed by <br />Mountain Pine beetle where water tables have been elevated by road <br />building near South Lake Tahoe. Weather modification will most <br />likely reduce the frequency of "low water table years. II <br /> <br />The span of the root system can affect the distance that such dis- <br /> <br />eases as F. annosus root rot are likely to spread between trees~ <br /> <br />1-12 <br />