International Journal of Acarology (2012) 38, 251-256

Maryam Pahlavan Yali, Jabraeil Razmjou, Mohammad Khanjani, Ali Golizadeh and Mehdi Hassanpour (2012)
Life history traits of Tetranycopsis horridus (Canestrini and Fanzago) (Acari: Tetranychidae) at three constant temperatures
International Journal of Acarology 38 (3), 251-256
Abstract: Tetranycopsis horridus (Canestrini and Fanzago) (Acari: Tetranychidae) infests hazelnut leaves and causes conspicuous white or yellowish feeding spots throughout the forests of hazel in Ardabil region, Iran. Information on this mite in all parts of the world is scarce. In this study, we determined the survivorship and life history parameters of T. horridus on hazelnut leaves under laboratory conditions at 15°C, 20°C and 25°C, at 60% relative humidity and in a photoperiod of 16:8 hours (light:dark). The threshold temperature for development and the degree days for this mite were found to be 5.9°C and 811.1, respectively. Maximum fecundity was recorded at 25°C with 4.4 eggs per female. At 25°C, females laid a mean of 8.25 eggs during a mean oviposition period of 15.8 days. The intrinsic rates of natural increase (r _m) were 0.019, 0.026 and 0.031 individuals per mite per day at 15°C, 20°C and 25°C, respectively. These facts might be helpful to improve production in hazelnut fields.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Jabraeil Razmjou, Mohammad Khanjani, Ali Golizadeh

Research topic(s) for pests/diseases/weeds:
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranycopsis horridus	Hazelnut (Corylus)	Iran