Nancy Guthrie’s neighborhood association has asked supporters to stop leaving mementos and flowers outside her Tucson residence three months after her apparent dead-of-night abduction, citing warmer temperatures and encroaching wildlife. “I write this message with a very heavy heart as our friend and neighbor, Nancy Guthrie, remains missing ,” Catalina Foothills Association president Will Pew wrote Monday in the organization’s latest newsletter. He recognized that “leaving flowers, missives and other items at Nancy’s house has been fueled by good intentions ” but said “javelinas, packrats, wind and increasing temperatures” were making it difficult to maintain the area and keep it safe. The newsletter encouraged well-wishers instead to donate to World Vision , “an organization that Nancy loves,” that works to end poverty . Nancy Guthrie, 84, the mother of “Today” co-host Savannah Guthrie , was abducted from her home in the wee hours of Feb. 1.…