Belete Gutu Geleto, Getahun Gulich


Spider mite has been one of the major constraints of tomato production in the central rift valley of Ethiopia. The main obstacle in spider mite control in the area is associated with failure of control of tomato spider mite using the available pesticides from time to time. The objective of this study was to evaluate the level of resistance of two spotted spider mite for different acaricides in the central rift valley of Ethiopia. To determine the level of resistance, spider mite populations were collected from four major locations of tomato production areas in central rift valley of Ethiopia such as “Zewai”, “Meki”, “Adama”, and “upper Awash”, leaf dipping assay was performed for different concentrations of dicofol, profenos, endosulfan, abamectin, lambda-cyhalothrin, amitraz. Probit analysis was used to determine the LC50.  RF was calculated to asses the development of resistance in the test populations using the “Hawassa” population for they have not been exposed for pesticedes as a control. The RF ranged from 1.79 to 3.11for dicofol, 0.92 to 2.26 for profenose, 1.37 to 1.67 for abamectine, 1.34 to 1.71 for endosulfan, 0.88 to  2.01 for lambda-cyhalothrin  1.99 to  4.47 for amitraz  (p<5). The highest RF was observed in “Upper Awash” population of T. urticea. In the T. urticae population of Upper Awash showed resistance to dicofol, profenos, lambda-cyhalothrins and amitraz whereas in Adama and Meki, there is resistance to dicofol, profenos and amitraz. On the other hand, T. urticae population from Zewai is susceptible to all acaricides except amitraz. All the studied populations were susceptible to abamectin and endosulfan. In  general,  the  result  suggests  that  the  emergence  of  resistance  in  the  T.  urticae populations for most of the acaricides in the rift valley of Ethiopia and should be reduced through finding appropriate resistance management mechanism. 


acaricide resistance, LC50,, RF, T. urticae, Central rift valley of Ethiopia


Abbott, WS., (1925). A method of computing the effectiveness ofan insecticide. J.Econ. Entomol. 18:265-267.

Anonymous, (1957). World Health Organization. Expert Cofmittee on Insecticides,7th Rept.Tech. Rept. Series 125:11 pp.

Ay, R. and Gurkan, M. O, (2005). Resistance to bifenthrin and resistance mechanisms of different strains of the twospotted spider mite (Tetranychus urticae Koch) from Turkey. Phytoparasitica 33: 237-244.

Ay, R., (2005). Determination of Susceptibility and Resistance of Some Greenhouse Populations of Tetranychus urticae Koch to Chlorpyrifos (Dursban 4) by the Petri Dish-Potter Tower Method. J. of Pest Sci. 78: 139-143.

Ayalew, G., Mulatu, B., Negeri, M., Merene, Y., Sitotaw, L., Ibrahim A. and Tefera, T., (2009). Review of research on insect and mite pests of vegetable crops in Ethiopia; Conference proceeding on crop protection. Ethiopian Institute of Agricultural Research, Addis Ababa.

Beers, E.H, Riedl, H. and Dunly, J.E., (1998). Resistance to abamectin and Reversion to susceptibility in fenbutatin oxide in spider mite (Acari: Tetranychidae) population in the pacific Northwest. J. Econ. Entomol., 91:352-360.

Campos, F., Krupa, D.A. and Dybas, R.A., (1996). Susceptibility of population of two- spotted spider mites (Acari: Tetranychidae) from Florida, Holland, and the Canary Islands to abamectin and characterization of abamectin resistance. J. Econ. Entomol. 89(3): 594-601.

Comins, H.N., (1977). The development of insecticide resistace in the presence of migration. J. Theor. Biol., 64: 177- 197.

Demircan, V., and Yılmaz, H., (2005). The analysis of pesticide use in apple production in Isparta province in terms of economy and environmental sensitivity perspective. Ekoloji 14:15-25.

Finney, D.J., (1964). Probit statitistics: a statistical treatment of the sigmoid response curve. Cambridge University Press, London.

Gorman, K., Hewitt, F., Denholm, I. and Devine G.J., (2001). New developments in insecticide resistance in the glasshouse whitefly (Trialeurodes vaporariorum) and the two-spotted spider mite (Tetranychus urticae) in the UK. Pest Mang. Sci. 58: 123-130.

Helle, W., (1962). Genetics of resistance to organophosphorus compoundes and its relation to diapauses in T. urticae Koch (Acari). Tijdschrift Plantenziekten, 63:155.

Herron, G.A and Rophail, J., (1998). Tebufenpyrad Resistance detected in two spotted spider mite Tetranychus urticae, Coch (Acari: Tetranychidae) from apples in western Australia. Exp. Apl. Acari., 22:633-641.

Hoyt, S.C., Westigard, P.H. and Croft, B.A. (1985). Cyhexatin resistance in Oregon populations of Tetranychus urticae Koch (Acarina: Tetranychidae). J. Econ. Entomol. 78: 656-659.

Keena, M.A. and Granett, J., (1987). Cyhexatin and propargite resistance in populations of spidermites (Acari: Tetranychidae) from California almonds. J. Econ. Entomol. 80: 560-564.

Nauen, R., Stumpf, N., Elbert, A., Zebitz, C.P.W. and Kraus, W. (2001). Acaricide toxicity and resistance in larvae of different strains of Tetranychus urticae and Panonychus ulmi (Acari: Tetranychidae). Pest Managment Sci. 57: 253-261.

O'Brien, R.D., (1967).Insecticides,action and metabolism.Academic Press, New York and London, 332 pp.

Ramasubramanian, T. (2004). Magnitude Mechanism and Management of pyrethroid resistance in Helicoverpa armigera Hubner in India J. Entomol., 1:6-11.

Regupathy, A., ramasubramanian, T. and Ayyasamy, R. (2004). Rationale behind the use of insecticide mixiture behind the management of insecticide resistance in India. J. Food, Agric. Environ., 2:278 – 284.

Sawicki, R.M. and Denholm, I. (1987). Management of resistance to Pesticides in cotton pests. Trop. Pest Manag. 33(4): 262-272.

Schoknecht, U. and Otto. (1992). Metabolic Resistance Factors of Tetranychus urticae

Tian, T., Grafton, E.E. and Granett, J. 1992. Resistance of Tetranychus urticae Koch


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