Landscape Trees and Their Susceptibility to Invasive Insects

invasive insects on trees

In recent years several exotic insects have either entered NH or are nearby on our doorsteps. Native plants have no natural defenses against exotic insects, which makes these invasive pests so devastating and able to spread so rapidly once they are introduced. These invaders include the Asian longhorned beetle (ALB), emerald ash borer (EAB), hemlock woolly adelgid (HWA), and elongate hemlock scale (EHS). All four insects are pests of forest and landscape trees, and they will have economic impacts on the landscape and economy of New Hampshire.

New Hampshire is more than 80% forested. The New Hampshire forest, tourist, maple syrup, landscape, and nursery industries are valued at more than $2 billion a year and provide 15,000 jobs. Additionally, invasive insects may severely impact native and natural forest areas, interrupting natural succession, opening areas up to non-native invasive plants, and subsequently disrupting the ecology and food web. We must do our best to prevent the invasion of the harmful exotic insects that aren't yet here, like the ALB, and manage those that are, including the EAB, HWA and EHS.

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