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^: *http://esa.publisher.ingentaconnect.com/content/esa
^: Pakyari H.; Fathipour Y.; Enkegaard A.
^: Effect of Temperature on Life Table Parameters of Predatory Thrips Scolothrips longicornis (Thysanoptera: Thripidae) Fed on Twospotted Spider Mites (Acari: Tetranychidae) [ , , , Scolothrips longicornis, (Tetranychus urticae)]
^: Journal of Economic Entomology, 2011; Vol.104,N 3. - P. 799-805
^: 2011
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^: Environmental variables such as temperature are important factors that affect the efficiency of biological control agents. This study examined the effect of temperature on the sex ratio, longevity, oviposition periods, fecundity and life table parameters of the predatory thrips Scolothrips longicornis Priesner (Thysanoptera: Thripidae) fed on twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), at six constant temperatures: 15, 20, 26, 30, 35, and 37C. Approximately 75% of the progeny were female, except at 37C, at which temperature the proportion of males increased. Adult longevity as well as the preoviposition, oviposition, and postoviposition periods decreased significantly with temperature. Thus, adults lived for &#8776;5 wk at 15C and <1 wk at 37C with preoviposition, oviposition, and postoviposition periods ranging from 6.4 to 0.4, 24.4&#8208;3.1, and 7&#8208;0.8 d between the two temperature extremes, respectively. The maximum (56.48 eggs) and minimum (11.69 eggs) value of total fecundity was recorded at 26 and 37C, respectively. The intrinsic rate of natural increase (rm ) of S. longicornis increased linearly with increasing temperature from 0.056 d&#8722;1 at 15C to 0.310 d&#8722;1 at 35C. The lower temperature threshold for the population increase of S. longicornis was estimated to be around 5C. The data suggest that the upper temperature threshold for the predatory thrips is &#8776;37C. The results showed that populations of S. longicornis are able to develop at a broad range of temperatures and that this predator is well adapted to the high temperatures that occur in the Mediterranean region. aref1

^TRN: 1382415
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