Alireza KHALIL ARIA, Mohsen MOROVATI, Mehdi NASERI

Efficacy of the Rodenticide Bromethalin in the Control of Microtus arvalis and Nesokia indica in Alfalfa Fields

Rodents cause huge losses to agricultural crops annually. During outbreaks, this pest can cause irreversibly high damage. Solely non-chemical control measures have not been successful in reducing the population of this pest; therefore, the use of chemical rodenticides, especially on crops like alfalfa, is unavoidable. Bromethalin is a neurotoxic, acute, single-dose rodenticide with high efficacy, and since it is mostly used in wax formulation it is not attractive to non-target organisms, and hence is not very dangerous. Bromethalin 0.01% was tested in alfalfa fields of west Azerbaijan, Tehran, and Kerman provinces in completely randomised treatment blocks with 4 treatments (bromethalin wax block, bromethalin pellets, 2% zinc phosphide baits, and control) and 4 replicates. Efficacy was calculated using the Henderson and Tilton formula and the results were analysed by SPSS. The results show that bromethalin with pellet formulation had the highest efficiency in controlling Microtus arvalis and Nesokia indica in the alfalfa fields, followed by bromethalin with wax block formulation, and the least efficient was zinc phosphide baits (2% Zn2P3 mixed with wheat and oil) in W. Azerbaijan. In the alfalfa fields of Kerman and Tehran provinces bromethalin wax was more effective than bromethalin pellets. Considering the ready-made bait formulation of bromethalin, it is much safer and easier to use than zinc phosphide bait, which has to be prepared on the farm, and this can cause higher contamination and poisoning risk to the environment and the applicators.

Anahtar Kelimeler:

Nesokia indica, Microtus arvalis, efficacy, bromethalin, alfalfa, Iran

Efficacy of the Rodenticide Bromethalin in the Control of Microtus arvalis and Nesokia indica in Alfalfa Fields

Keywords:

Nesokia indica, Microtus arvalis, efficacy, bromethalin, alfalfa, Iran,

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Cherry, L.D., Gunnoe, M.D. and Vanlier, R.B.L. 1982. The metabolism of bromethalin and its effects on oxidative phosphorylation and cerebrospinal fluid pressure. The Toxicologist 2: 108.
Dreikom, B. and O’Dorherty, G.O. 1984. The discovery and development of bromethalin, an acute rodenticide with a unique mode of action. American Chemical Society. 45-63.
Jackson, W.B., Sqaulding, S.R., Vanlier, R.B.L. and Dreikom, B.A. 1982. Bromethalin-a promising new rodenticide. Proceedings of tenth vertebrate pest conference (R.E. Marsh, Ed.). University of California, Davis, California.
Main, Y., Haque, E., J.E. Brooks and Savarie, P.J. 1993. Laboratory evaluation of bromethalin as a rodenticide against Bandicota bengalensis. Gray, Univ. J. Zoology, Rajshahi University. 12: 15- 19.
Prakash, I., 1986. Rodent Pest Management. CRC Press Inc, Boca Raton, Florida.
Vanlier, R.B.I., Ottosen, L.D., Hanasono, G.K. and Carter, J.L. 1980. Studies on the toxicity of El-614 (bromethalin), a new rodenticide. Presentation 19th Annual Meeting of the Society of Toxicology.
Zhao-Mingeli, Feng, Q., Shuting, G., Yansheng, S., Nasitu, Z., Zhongfu, D., Jun, H., Shenyun, D., Zhao, M.L., Qiao, F., Gao, S.T., Shi, Y.S., Zhao, N.S.T., Dong, Z.F., Hao, J. and Du, S.Y. 1994. A test on the use of rodenticides against Microtus brandti. Grassland of China. 4: 51-53.