The effect of nitrogen fertilization of white spruce (Piceaglauca) on the yellow-headed spruce sawfly (Pikonemaalaskansis)

Autor:	E. H. White, H. M. Kulman, M. P. Popp
Rok vydání:	1986
Předmět:	Global and Planetary Change education.field_of_study Larva Ecology Ammonium nitrate Population Forestry Biology biology.organism_classification Population density chemistry.chemical_compound Sawfly Human fertilization Animal science chemistry Botany PEST analysis education Tenthredinidae
Zdroj:	Canadian Journal of Forest Research. 16:832-835
ISSN:	1208-6037 0045-5067
Popis:	Fertilization with 224 and 448 kg Nha−1 applied to white spruce, Piceaglauca (Moench) Voss, as ammonium nitrate significantly increased concentrations of foliar N. Trees with 1.10 to 1.29% foliar N on July 3 had the highest average number of yellow-headed spruce sawfly, Pikonemaalaskansis (Rohwer), larvae per tree (final population) and the lowest percent mortality. This corresponded to trees receiving 224 kg N ha−1. Although not significantly, the final population increased, and the percent mortality decreased with increasing N concentrations up to 1.29% (July 3) (N-deficient trees). As foliar N concentrations, at the time of feeding, increased above 1.29% (N-sufficient trees), final population decreased and percent mortality increased. Therefore, indiscrimate use of fertilizers may increase insect numbers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b9b846943c4c8a9b325039bd4f4acfa0 https://doi.org/10.1139/x86-146 Zobrazit plný text záznamu