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4� <br />By diversifying the City's <br />high profile landscapes such as the City's <br />downtown trees, we can ensure that the <br />canopy endures even if one <br />or more species are threatened. <br />irrigation these species will need to maintain health during <br />periods of drought and extreme heat. Trees that are in poor <br />health and stressed are more susceptible to invasive pests <br />and diseases. The species composition and diversity of <br />trees in Pleasanton's urban forest play a central role in long- <br />term urban forest health. Beginning to plant tree species <br />that are likely to be adapted to future climate conditions and <br />diversifying the overall makeup of the City inventory will <br />create a more resilient urban forest against these threats. In <br />2020, the City lost a few of its last remaining American Elm <br />trees in Civic Park as they succumbed to Dutch Elm Disease <br />(DED). Starting in the 1930s, DED almost completely wiped <br />out the species throughout America. Almost a century later, <br />it is still a serious concern. The redesign of the park <br />included a climate adapted oak tree that will provide similar <br />benefits as the elms without the pest and disease problems. <br />KEY FINDINGS <br />CITY OF PLEASANTON URBAN FOREST MASTER PLAN 1 17 <br />