Onion thrips, Thrips tabaci (L) is a key pest of onion and their control is vital to the production and profitability of this crop. If onion thrips are not controlled, damage can routinely reduce bulb yields by 23-85%. Most onion fields need protection against thrips for two to three months and multiple applications are required to control infestations, but there are few labeled insecticides that provide effective and consistent control. Therefore, the present study was conducted in two locations viz. Ambo and Guder, Western Shewa of Oromia Regional state, Ethiopia. A factorial experiment was laid out in randomized complete block design with three replications to evaluate the effect of insecticides (Cutter 112 E.C TM and Triger 5% E.CTM) and botanicals (Azadirachta indica L. and Dodonae angustifolia L.) on onion thrips on farmers cultivated filed. The results of the study revealed that the newly introduced both insecticides gave promising mortality rate and not significantly (P<0.001) different compared with the standard check previously registered (Diazinon 60 E.CTM) and highly significant (P<0.001) different from the untreated check. The botanicals, A. indica and D. angustifolia, fresh leaf extracts with foliar application gave promising mortality rate used as alternative control measures of onion thrips, while the combination of two botanicals were found less effective as compared with other treatments but significantly different from untreated check. From this study, we concluded that the newly introduced insecticides Cutter 112 E.C TM and Triger 5% E.CTM could be recommended to be registered as alternative insecticides. The two botanicals (A. indica and D. angustifolia) fresh leaf for making bio-pesticide, which are easily available in the surrounding areas, are better option and eco-friendly to adopt for controlling onion thrips in Ethiopia.
Key words: Botanicals, Onion thrips, Evaluation, Efficacy, Mortality, Insecticides.
CSA. Report of Federal Democratic Republic of Ethiopia, Statistical Report on Socio-Economic Characteristics
of the Population in Agricultural Households, Land Use, Area and Production of Crops. Addis Ababa, Ethiopia,
Havey, M.J. Galmarini, C.R. Gökçe, A.F., Henson, C. QTL affecting soluble carbohydrate concentrations in
stored onion bulbs and their association with flavor and health-enhancing attributes. Genome, 2004. 47: 463–468.
Wang, B. Lin, S. Hsiao, W. Fan, J., Fuh, L., Duh, P. Protective effects of an aqueous extract of Welsh onion
green leaves on oxidative damage of reactive oxygen and nitrogen species. Food Chem, 2006. 98: 149–157
Abate T. Vegetable Crops Pest Management In: (Eds.) W Godfrey W, Bereke, T.T.Proceedings of the first
Ethiopian Horticultural Workshop, Addis Ababa, Ethiopia. 1985. Pp. 52-55.
Trdan ,S. Vali, N. Zezlina, I. Bergant, K. Znidar, D. Light blue sticky boards for mass trapping of onion thrips,
Thrips tabaci Lindeman (Thysanoptera: Thripidae), in onion crops. J of Plant Dis and Prot, 2005. 12: 173-180
Brewster, J.L Onions and other vegetable alliums, CAB International, Wallingford, UK. 1994.
Nawrocka, B. Economic importance and the control method of Thrips tabaci Lind. on Onion, 2003.
IOBC/WPRS Bulletin No. 26, pp. 321-324
Merene, Y. Study on Population ecology and yield loss of onion thrips (Thrips tabaci) on onion in Showa Robit
district of Amahara region. M.Sc. Thesis, Addis Ababa University, Ethiopia. 2005. Pp. 20 – 43.
Tadele, S. Mulugeta, N. Salvaraj, T. Evaluation of Some Botanicals and Entomopathogenic Fungi for the Control
of Onion Thrips (Thrips tabaci L.) in West Showa, Ethiopia. J. Plant pathol. Microb, 2013. 4: 161.
Bekele, E. Azerefegne, F. Abate, T. Facilitating the implementation and adoption of IPM in Ethiopia.
Proceedings of a Planning Workshop, ASAI/EARO, Nazerath, Ethiopia Bassett, M.J. 1986. Breeding Vegetable
Crops. AVI Publishing Co. Inc. West Port. Connecticut. 2006. Pp. 584.
SAS Institute The SAS system for windows, version 8.0. SAS, Institute, Cary, NC.
Gomez KA, 1999.
Hazara, A.H. Shkeel, M. Khan, J. Iqbal, M. Khan, S. An effect of non-chemical methods and botanical
insecticides on onion thrips,Thrips tabaci, Lindman (Thysanoptera: Thripdae) in onion crop in Balochistan. Sarhad
J. Agri.,1999. 15: 619-624.
Garrett, J. H. Howard Garrett's Organic Manual. The Summit Group, Fort Worth, TX. 1993. Pp. 203
Anon. Peaceful Valley Farm Supply 2003 Main Catalog. Peaceful Valley Farm Supply, Grass Valley, CA.,
George, K. Thrips Management Alternatives in the Field. NCAT Agriculture Specialist, 2004. ATTRA
Sujay P., B.K. Singh, R.P. Gupta. Effect of Neem based Botanicals, Chemicals and bio-insecticides for the
Management of thrips in onion. Indian J. of Agricultural research, 2013. Vol. (47) 6. Pp. 545-548
Mishra, D.K., Gopesh P., Tailor, R.S and Alok D. On Farm Trial: An Approach for Management of Thrips in
Onion. Indian Res. J. Ext. Edu. ,2007 .7 (1).
Edelson, J.V., Cartwright. B., Royer, T. A. Economics of controlling onion thrips (Thysanoptera:
Thripidae) on onions with insecticides in South Texas. J. of Eco. Entomol., 1989. 82(2): 561-564
Mayer, D.F., Lunden, J.D., Rathbone, L. Evaluation of Insecticides inthe control of Thrips tabaci
(Thysanoptera: Thripidae) and Effects of Thrips on Bulb onions. J. Eco. Entomol. , 1987. 80: 930-932.
Malik, M.F., Nawaz, M. Hafeez, Z. Inter and intra row spacing effects on Thrips (Thrips spp)
population in onion (Allium cepa). Asian J. Plant Sci., 2003. 2(9): 713-715