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These insects have managed to eliminate close to 300,000 Ash trees in the National Capital Region in only nine years. This leaves only 80,000 ash trees left standing either due to luck or to some amount of resistance to the beetles. These forests used to have an extremely dense Ash population, having 17-18 trees per Hectare.
The invasive beetle that kills ash trees has traveled to new areas in Texas. Texas A&M Forest Service confirmed last week that the emerald ash borer is now in five counties in North and Central Texas.
Hylesinus aculeatus, the eastern ash bark beetle, is a species of crenulate bark beetle in the family Curculionidae. It is found in North America. [1] [2] [3]
Dutch elm disease was spread by elm bark beetles, yet the tree mortality was caused by a pathogen. [4] Chestnut blight is a fungus spread through wind dispersal and rain splatter; the blight traveled up to 50 miles in a year by natural means. [5] Insect pests, once they reach the adult phase, have the ability to disperse by flight.
Image of black ash trunk. Tree is located in a seasonally wet, riparian habitat near a small-scale stream. Tree bark is corky and spongy. Black ash is a medium-sized deciduous tree reaching 15–20 metres (49–66 ft) (exceptionally 26 metres (85 ft)) tall with a trunk up to 60 cm (24 inches) diameter, or exceptionally to 160 cm (63 inches).
Fraxinus americana, the white ash or American ash, is a fast-growing species of ash tree native to eastern and central North America. White ash trees are threatened by the invasive emerald ash borer .
Cucujus clavipes is known as the flat bark beetle. [1] [2] It is found throughout North America. [3] These are generally found near tree line [4] under bark [2] of dead poplar and ash trees. [5] C. clavipes are described as phloem-feeding [6] and often predators [1] of other small insects, such as wood-boring beetles, and mites. [5]
Bark beetles enter trees by boring holes in the bark of the tree, sometimes using the lenticels, or the pores plants use for gas exchange, to pass through the bark of the tree. [3] As the larvae consume the inner tissues of the tree, they often consume enough of the phloem to girdle the tree, cutting off the spread of water and nutrients.