Appearance: Larvae have reddish brown heads, yellow bodies with six rows of irregular black spots. Introduced pine sawfly: eastern white pine They have three pairs of legs at the front and six to seven pairs of prolegs at the rear. Also attacked are shortleaf, loblolly, slash, pitch, Swiss mountain, Japanese black, mugho pines, white pine, larch, deodar cedar, and Norway spruce. This species is an important defoliator of young southern yellow pines (less than 15-20 feet tall). Several species are native to Texas, but the one that causes the most concern is the redheaded pine sawfly, Neodiprion lecontei (Fitch). 1. Hymenoptera: Diprionidae. [2], The adult N. lecontei has membranous wings and a broad waist and is between 5 and 8.5 mm (0.20 and 0.33 in) long, with the males being somewhat smaller than the females. Red-headed pine sawfly damage is observed primarily in pine plantations and on trees less than 3 m tall in natural forests. Life cycle: Spend the winter as pupae in the soil. In the northern part of its range, it favours hard or yellow pines such as Pinus banksiana and Pinus resinosa. The eggs hatch after about four weeks. Depending on the severity of the attack, the consequences of defoliation may range from growth reduction to the mortality of affected trees. Older larvae eat the whole needle before moving on to the next. Its range extends from southeastern Canada westwards to the Great Plains and southwards to Texas and Florida. The genome has been sequenced and consists of 330 MB arranged on seven chromosomes. If the tree is completely defoliated, the larvae move as a group onto a neighboring tree, or may start chewing at the soft bark of twigs. The larvae are gregarious, and can strip whole branches and trees of needles. This species was named after John Lawrence LeConte, an American entomologist of the 19th century. Further south, it prefers Pinus echinata, Pinus taeda, Pinus elliottii and Pinus palustris. Hosts: Preferred hosts are red, Scots and jack pines. Stressed trees are most often attacked. The larvae feed on the foliage of many species of native and imported pines. Trees less than 5 m (16 ft) tall are frequently attacked, and plantations of pine established in the 1930s saw the insect reach pest proportions. Neodiprion lecontei is a species of sawfly in the family Diprionidae native to eastern North America, commonly known as the red-headed pine sawfly or leconte's sawfly. They are 20-30 mm (3/4 - 1") long when fully grown. Some individuals may not emerge as adults until the following year,[4] or have an extended diapause. Males have feathery antennae while females have serrated ones with nineteen segments. Rather … [3] The larvae resemble the caterpillars of lepidopterans; young larvae are whitish with brown heads while older larvae are yellowish-green with up to eight longitudinal rows of black spots, and brown heads. [4], N. lecontei is native to eastern North America. [3], The larvae feed on many members of the pine family. This sawfly prefers to feed on jack, red, shortleaf, loblolly, slash, longleaf, pitch, Swiss mountain, and mugo pines. The young larvae feed on the sides of the pine needle, leaving an uneaten central section which withers and dies, remaining on the tree giving a distinctive straw-like effect. In the northern part of the range there is a single generation each year, but further south there may be two or three, sometimes overlapping, generations. Sawflies are not true flies. [3], The adult female sawfly cuts slits in pine needles with her ovipositor and deposits one egg in each slit. The ovipositor of all adult female sawflies is saw-like, and is likely where the common name for this group (suborder) originated (PADCNR 2010). Other host trees that the larvae will feed on include Pinus virginiana, Pinus strobus and Pinus sylvestris, and if nothing else is available, Picea abies, Cedrus deodara and Larix spp. [3], "Fourth Report on the Noxious and Other Insects of the State of New-York",, Creative Commons Attribution-ShareAlike License, This page was last edited on 15 February 2018, at 21:30. This species was named after John Lawrence LeConte, an American entomologist of the 19th century. Here they overwinter as prepupae, pupating in the spring and biting their way out of one end of the cocoon to emerge as adults.

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