Lift History of a Ponderosa Pine Coneworm, Dioryctria auranticella (Lepidoptera/ Pyralidae)

1989

2 Abb., 3 Tab., 18 Lit. Ang.

Unselbständiges Werk

10622

200042739

Dioryctria auranticella (Grote), a coneworm that infests ponderosa pine, Pinus ponderosa Douglas ex P. Lawson and Lawson, and Austrian pine, P. nigra Arnold, in southeastern Nebraska is univoltine. Head capsule measurements indicate five instars. First instars apparently overwinter in hibernaculae. Second and third instars feed in male and female pine flowers during early May. Fourth and fifth instars tunnel in second-year cones for about 2-3 wk between mid-May and mid-June and often require two cones to complete development. Larvae pupate within cones during June, and adults are active from mid-June to late July. At 26C, eggs hatch in 6-9 d. Ichneumon brunneri Rohwer was the most abundant of eleven parasite species reared from cones damaged by D. auranticella.