Trees in the red oak group share root systems through natural grafts, which facilitates the underground spread of oak wilt. Red oaks are more vulnerable to oak wilt than white oaks. Red oak, white oak, northern pin oak, bur oak. Leaves on white oaks have rounded tips (Figure 2).įigure 2. Red oaks, including black oak, have leaves with pointed tips. Several red oak and white oak species do occur in Michigan. Live oaks are common in southern states and do not occur in Michigan. Oaks are divided into three taxonomic sections red oaks (Lobatae or Erythrobalanus), white oaks Quercus or Leucobalanus), and live oaks (Protobalanus). Source: US Forest Service Forest Inventory & Analysis data, 2009. Oak Species in Michigan Forest Land, FIA 2009 (10.5% of total forestland volume) Oak species occur throughout Michigan (Figure 1).įigure 1. ![]() According to Voss (1985), there are 11-12 species of oak in Michigan. Oak species are distributed throughout Michigan (Table 1). Eleven oak species occur in the 2009 USDA Forest Inventory & Analysis surveys. Introduced species of oak are also used in landscapes in Michigan and many other states. There are at least 58 native species of oaks in the USA, most of which occur in the eastern United States. It is especially abundant in some localized areas. The disease is present throughout much of the oak range in both the Lower Peninsula and Upper Peninsula. Home construction or utility work in woodland areas, and other human activity, can increase the spread of oak wilt. The spread and impacts of oak wilt have recently attracted more attention in Michigan due, in part, to an extensive oak resource across much of the state, which comprised 10 percent of the forest volume in the state. ![]() The fungus that causes oak wilt is likely an exotic species but to date it has not been identified anywhere outside the U.S. Oak wilt (Ceratocystis fagacearum), first identified in the USA in the early 1940s, is a serious disease affecting many oak species throughout the eastern United States. ![]() It’s important to avoid wounding oaks from April through July. Oaks are also abundant and important landscape trees in urban and suburban areas. Annual value of oak stumpage exceeds $10 million. Acorn production is an important food source for many wildlife species. Oaks are popular tree species and often are of concern to forest owners and all Michigan citizens.
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