The yellow-headed spruce sawfly, Pikonema alaskensis, is widely known in the northern United States and Canada as a destructive pest of spruce. It attacks white, black, Norway, and Colorado blue spruces. The larvae at first prefer new foliage, but after becoming about half-grown, old needles are included in their diet too. Young plantations become susceptible a few growing seasons after establishment. WebAll stages are described. The larvae were only observed infesting Picea canadensis, of which the new growth was devoured. The adults appeared between 28th May and 8th June, and oviposited in 1 or 2 days. The number of eggs in the ovaries of 17 females varied from 23 to 69. PDF emailed within 1 workday: $29.90 Credit Card PayPal Related References
Sawflies UMN Extension - University of Minnesota
WebThe yellowheaded spruce sawfly, Pikonema alaskensis (Rohwer), is a native insect and an important defoliator of young white spruce, Picea glauca (Moench) Voss, in plantations … WebJun 15, 2006 · Pikonema alaskensis is a major pest of juvenile, open-grown spruce throughout central and northeastern North America (Katovich et al., 1995). Black spruce is the primary host of P. alaskensis in central Newfoundland, however white spruce ( P. glauca [Moench] Voss) and blue spruce ( P. pungens Engelm.) are also susceptible … hakewill construction company
Yellowheaded spruce sawfly--its ecology and management.
WebThe yellow-headed spruce sawfly, Pikonema alaskensis (Rohwer) (Hymenoptera: Tenthredinidae), is a native defoliator of spruce throughout the northern United States and Canada. Young open grown trees such as ornamentals in landscape plantings, shelterbelts, plantations, and nurseries are especially vulnerable. WebMales are shiny black with a reddish-orange band on the abdomen. Females are reddish-orange with black markings on the thorax. They typically range from 8 – 10 mm in length. The antennae are black, long … WebJun 15, 2006 · Pikonema alaskensis is a major pest of juvenile, open-grown spruce throughout central and northeastern North America (Katovich et al., 1995). Black spruce is the primary host of P. alaskensis in central Newfoundland, however white spruce (P. glauca [Moench] Voss) and blue spruce (P. pungens Engelm.) are also susceptible (Forbes, 1949). hake watercolour painting brushes