Sublethal effects of spirotetramat on demographic parameters of two-spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae)

Document Type : Research paper-Persian

Authors

1 1Department of Entomology and Plant Pathology, callage of aburihan ,University of Tehran, Pakdasht

2 deraptement of entomology and plant pathology, college of aburaihan, university of tehran, iran

3 Department of Entomology, Faculty of Agriculture, Tarbiat Modares University, Tehran

Abstract

The two-spotted spider mite Tetranychus urticae Koch(Acari: Tetranychidae) is one of the most important and destructive herbivorous mites in fields and greenhouses, and its control is very important due to the wide range of its hosts.
Materials and Methods
The sublethal effects of spirotetramat based on leaf dipping method were evaluated on demographic parameters of two-spotted spider mite in the laboratory conditions of 25±1 ºC ,60±5% RH and a photoperiod 16:8 hours (L:D). The obtained data were analyzed based on age-stage two sex life table theory.
Results
All sublethal concentrations caused a significant decrease in oviposition period, total fecundity, longevity and total life span compared to control. Maximum and minimum means of longevity of male and female mite were observed in untreated and LC35 groups. Total fecundity varied from 18.12 (offspring/individual) in treatment with 35% sublethal to 57.71(offspring/individual) in control. The lowest net reproductive rate (R0 (was estimated at 11.95 (offspring/individual) at the highest experimental dose. The intrinsic rate of population increase (rm) was recorded as 0.22 offspring/individual/day in control and 0.17 offspring/individual/day in LC35 treatments, respectively. Mean generation time (T) was not significantly affected by different tested doses.
Discussion
The results of this study demonstrated that sublethal dosage (LC35) of spirotetramat was effective against two-spotted spider mites.

Keywords

Plant Protection (Scientific Journal of Agriculture)
Volume 41, Issue 3
October 2018
Pages 17-30

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