Open AccessEfficay of a Systemic Insecticide in Reducing Populations of Black Pineleaf Scale (Nuculaspis Californica)
Author(s) -
Paul Flanagan
Publication year - 2003
Publication title -
arboriculture and urban forestry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.222
H-Index - 47
eISSN - 2155-0778
pISSN - 1935-5297
DOI - 10.48044/jauf.2003.036
Subject(s) - spring (device) , diaspididae , toxicology , biology , agronomy , forestry , horticulture , environmental science , pest analysis , geography , mechanical engineering , homoptera , engineering
In 2001, 66 ponderosa pines (Pinus ponderosa) infested with black pineleaf scale (Nuculaspis californica) near Leavenworth, Washington, U.S., were selected for an insecticide trial. Twenty-two pines were injected with a systemic insecticide in October 2001; in March 2002, an additional 22 pines were similarly injected. The remaining 22 pines served as a control. Branches were collected in October 2002, and scale density per meter of foliage was compared among the fall treatment, spring treatment, and control trees. Both spring and fall treatments significantly reduced scale densities on 2002 and 2001 foliage. The spring treatment was more effective than the fall treatment.