Journal of Plant Protection Research (2003) 43, 155-162

Barbara Czajkowska, Malgorzata Kielkiewicz and Ewa Puchalska (2003)
Population parameters as an indicator of susceptibility of ornamental coniferous plants to spruce spider mite
Journal of Plant Protection Research 43 (2), 155-162
Abstract: Bionomy of spruce spider mite (SSM) (Oligonychus ununguis Jacobi) on five species/cultivars of spruce and two species of cypress was studied under laboratory conditions during two consecutive growing seasons. The study showed influence of host-plant food on development time, fecundity and longevity of SSM. The comparison of intrinsic rate of natural increase (r_m) indicates the highest reproduction potential of SSM on Picea pungens (0.18), P. abies 'Nidiformis' (0.17), and P. glauca 'Conica' (0.14). SSM had much lowest r_m on P. omorica (0.08) and P. abies 'Virgata' (0.01). The reproductive potential of SSM on tested species of cypresses was similar: 0.12 and 0.10 on Chamaecyparis lawsoniana 'Golden Wonder" and C. pisifera 'Nana Aureovariegata', respectively. The results obtained clearly indicate that the population parameters can be a proper indicator of relative susceptibility/resistance of commercially available species/cultivars of spruce and cypress plants to SSM.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Barbara Czajkowska

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Oligonychus ununguis	Spruce (Picea)	Poland
	Oligonychus ununguis	Japanese cypress and relatives (Chamaecyparis)	Poland