Environmental Entomology (1996) 25, 1-6

Nili Pinhassi, David Nestel and David Rosen (1996)
Oviposition and emergence of olive scale (Homoptera: Diaspididae) crawlers: Regional degree-day forecasting model
Environmental Entomology 25 (1), 1-6
Abstract: We investigated the temperature-driven onset and rate of oviposition and egg hatch of the spring generation of the olive scale, Parlatoria oleae (Colvée), in northern Israel. Phenology was studied between 1992 and 1994 at different elevations (between 80 and 820 m above sea level) and on 2 different host species (apple, Malus silvestris Miller, and pear, Pyrus communis L.). The association between accumulation of degree-days (DD) and rate of oviposition and egg hatch was analyzed with simple linear regression using 10°C as the lower developmental threshold temperature and 15 February as the starting date. Temperature-driven rates of oviposition and egg hatch were similar for the 3 yr, all elevations, and the 2 tree species. Elevation, host species, and year did not meaningfully affect the amount of thermal units required by P. oleae to initiate oviposition and egg hatch. Oviposition and egg hatch is expected to begin at 40.1 and 184.8 DD, respectively. The model accurately predicted the onset of egg hatch during 2 yr consecutively in 1 tested plot (deviations between observed and expected dates of <3 d).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): David Nestel

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Parlatoria oleae	Apple (Malus)	Israel
	Parlatoria oleae	Pear (Pyrus)	Israel