Forecasting Potential Defoliation by Larch Casebearer in the Northern Rocky Mountains

Autor:	W. E. Bousfield, W. M. Ciesla
Rok vydání:	1974
Předmět:	Ecology biology Agronomy Coleophora laricella Sample point Insect Science General Medicine Quadratic regression model Larch biology.organism_classification Overwintering
Zdroj:	Journal of Economic Entomology. 67:47-51
ISSN:	1938-291X 0022-0493
DOI:	10.1093/jee/67.1.47
Popis:	A quadratic regression model (Y = 4.015 + 0.4419X − 0.001036X2) for forecasting defoliation potential by larch casebearer on western larch was developed. The model utilizes systematic counts of overwintering larvae of Coleophora laricella (Hubner) on 40 branch samples/sample point (X) to forecast intensity of feeding injury which is expressed as a numerical rating (Y) and can be translated into 4 broad classes of damage: negligible, light, moderate, and heavy. The model permits prediction of potential feeding injury to within 1 defoliation class, 98 out of 100 times.
Databáze:	OpenAIRE
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