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Title

SOME BIOLOGICAL AND DEMOGRAPHIC PARAMETERS OF TETRANYCHUS URTICAE KOCH ON THREE CUCUMBER CULTIVAR HYBRIDS (CUCUMIS SATIVUS)

Pages

 Start Page 77 | End Page 82

Abstract

 Tetranychus urticae Koch is one of the most serious greenhouse crops pest that requires an integrated pest management program (plant resistance, biological control and so on) to be controlled. In this study, the antibiosis resistance levels in three cucumber cultivar hybrids (Sina, Sultan and Fadia) to this pest were evaluated.Biological and demographic traits of T. urticae population such as DEVELOPMENTAL TIME, survivorship rate, FECUNDITY, adult longevity, the INTRINSIC RATE OF INCREASE and GENERATION TIMEs were determined on plants in the five-leaves stage in a growth room at 25±0.5oc, RH 65±5% and 16L:8D hours by clip cage and leaf disk methods.According to results, Fadia with the longest DEVELOPMENTAL TIME (11.07±2.4 days), the lowest survivorship (90.3±9%) and FECUNDITY (10.33±1.02 females) and rm (0.155+0.01), the shortest adult longevity (6.4±2.6 days) and the shortest GENERATION TIME (9.93±0.84 days) showed the most signs unsuitability of this cultivar for T.urticae population development; in contrast, Sina was the most suitable plant host for the two-spotted spider mites among the tested cultivars.

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