Use of Tank-mix Adjuvants to Improve Effectiveness and Persistence of Chlorpyrifos and Cyhalothrin Formulations

Authors
S. A. M. Abdelgaleil 1
N. F. Abdel-Aziz 2
E. A. Sammour 2
A. M. El-Bakry 2
S. M. I. Kassem 1
1 Department of Pesticide Chemistry, Faculty of Agriculture (Elshatby) Alexandria University, Alexandria 21545, Egypt.
2 Department of Pests and Plant Protection, National Research Centre, Dokki, Giza, Egypt.
Abstract
The use of adjuvants enhances the insecticide efficiency and increases the persistence of insecticides. In this study, the effect of adjuvants on the toxicity of chlorpyrifos and cyhalothrin formulations were investigated under laboratory and field conditions. The comparative toxicity of two chlorpyrifos [(48% Emulsifiable concentrate (EC)] formulations (Dursban and Pyrifos El Nasr), two cyhalothrin (5% EC) formulations (Halothrin Gold El Nasr and Lambada Mox) and two adjuvants (Top Film and Tritone K) were examined against the second and the fourth larval stages of Spodoptera littoralis. The effect of adjuvants on the toxicity of chlorpyrifos and cyhalothrin formulations were investigated under laboratory and field conditions. The results showed that Dursban exhibited the highest toxicity against the second and fourth larval stages of S. littoralis with LC50 values of 0.2 and 1.11 mg L-1, respectively. In contrast, Pyrifos El Nasr had the lowest toxicity against both larval stages. The results of joint toxic effect between adjuvants and insecticides indicated that adjuvants revealed potentiating effect on the toxicity of four insecticide formulations as co-toxicity factor values were greater than +20. Mixing the adjuvants with chlorpyrifos and cyhalothrin formulations in spraying tank before application of insecticides in field strongly increased the toxicity and the persistence of insecticides. Cyhalothrin formulations mixed with adjuvants gave continued significant mortality through 21 days, while chlorpyrifos gave continued significant mortality through 15 days of treatment. However, chlorpyrifos and cyhalothrin formulations without mixing with adjuvants gave significant mortality through 3 to 4 days of treatments. These results indicated that adjuvants increased efficiency and residual effect of chlorpyrifos and cyhalothrin commercial formulations. Therefore, the adjuvants can be used for reducing the number of applications in the season and the application rates of insecticides.

Keywords

1. Abd El-Mageed, A. E. M. and Shalaby, S. E. M. 2011. Toxicity and Biochemical Impacts of some New Insecticide Mixtures on Cotton Leafworm Spodoptera littoralis (Boisd.). Plant Protect. Sci., 47: 166–175.
2. Ahmed, S., Rasool, M. R., Irfanullah, M. and Rauf, I. 2004. Comparative Efficacy of Some Insecticides against Helicoverpa armigera Hub., Spodoptera spp. on Tobacco. Int. J. Agri. Biol., 6: 93-95.
3. Brady, U. E., Berisford, C. W., Hall, T. L. and Hamiton, J. S. 1980. Efficacy and Persistence of Chlorpyrifos, Chlorpyrifos-Methyl and Lindane for Preventive and Remedial Control of the Southern Pine Beetle. J. Econ. Entomol., 73: 639-641.
4. Chow, P. N. P., Grant, C. A., Hinshalwood, A. M. and Simundsson, E. 1989. Adjuvants and Agrochemicals. CRC Press, Inc., Boca Raton, FL. I and II.
5. El-Sheikh, T. A. A. 2012. Comparative Toxicity and Biochemistry of Organophosphates and Pyrethroid Compounds on Both Laboratory and Field Strain of the Cotton Leafworm Spodoptera littoralis (Boisd.). Egypt. Acad. J. Biolog. Sci., 4: 141-151.
6. El-Bakry, A. M., Ahmed, S. M., Sabra, F. S., Kassem, S. M. I., Sammour, E. A. and Abdelgaleil, S. A. M. 2012. Physicochemical Properties and Fungicidal Efficacy of Mancozeb Commercial Products in Egypt. Alex. Sci. Exchan. J., 33: 268-275.
7. El-Defrawi, M. E., Tappozada, A., Mansour, N. and Zeid, M. 1964. Toxicological Studies on the Egyptian Cotton Leafworm Prodenia litura L. Susceptibility of Different Larval Instar of Prodenia to Insecticides. J. Econ. Entomol., 57: 591-593.
8. El-Sobki, A. E. A. 2010. Enhancement of Pesticide Activity Using Certain Adjuvants and Application Systems. PhD. Thesis, Department of Plant Protection, Faculty of Agriculture, Zagazig University, Egypt.
9. Emara, S. A. 1999. Developmental Biology, Thermal Requirements and Prediction Models for Cotton Leafworm, Spodoptera littoralis (Biosd) in Cotton Fields. The 2nd Conf. of Pest Control, September, Mansoura, Egypt, PP. 731-736,
10. Finney, D. J. 1971. Probit Analysis. 3rd Edition, Cambridge University Press. London, 333 PP.
11. FAO. 2012. Food and Agriculture Organization of the United Nations. FAOSTAT, http://faostat.fao.org/site/339/default.aspx
12. Green, J. M. and Green, J. H. 1993. Surfactant Structure and Concentration Strongly Affect Rimsulfuron Activity. Weed Tech., 7: 633-640.
13. Hammami, H., Aliverdi, A. and Parsa, M. 2014. Effectiveness of Clodinafop-Propargyl, Haloxyfop-p-methyl and Difenzoquat-methyl-sulfate Plus Adigor® and Propel™ Adjuvants in Controlling Avena ludoviciana Durieu. J. Agr. Sci. Tech., 16: 291-299.
14. Holloway, P. J. 1998. Improving Agrochemical Performance: Possible Mechanisms for Adjuvancy. In: “Chemistry and Technology of Agrochemical Formulations”, (Ed.): Knowles, D. A.. Kluwer Academic Publishers. London, PP. 232-263.
15. Hosny, M. M., Topper, C. P., Moawad, G. G. and El-Saadany, G. B. 1986. Economic Damage Thresholds of Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) on Cotton in Egypt. Crop Protec., 5: 100-104.
16. Klein, M. 1984. Slow-release Formulations of Chlorpyrifos for Control of the Larvae and Eggs of the Egyptian Cotton Leafworm, Spodoptera littoralis (lepidoptera: noctuidae). Israel J. Entomol., XVIII: 83-89.
17. Lohag, M. G. M. and Nahyoom, Y. M. 1995. Comparative Efficacy of Hostathion, Sumicidin and Sevin xl R against Cotton Bollworms Sarhad. J. Agric. Res., 11: 963-368.
18. Mansour, N., El-defrawi, M. E., Toppozada, A. and Zeid, M. 1966. Toxicological Studies on the Egyptian Cotton Leafworm, Prodenia litura. VI. Potentiation and Antagonism of Organophosphours and Carbamate Insecticides. J. Econ. Entomol., 59: 307-311.
19. Mourad, M. A., Omar, M. E. and Mahran, A. A. 1988. Evaluation of Sequential Use of Insecticides against Cotton Leafworms and Bollworms. Agric. Res. Review., 66: 9-17.
20. Osipow, L. I. 1964. Surface Chemistry. Theory and Industrial Applications. Reinhold Publ. Crop, New York, 473 PP.
21. Osman, M. A. M. and Mahmoud, M. F. 2008. Effect of Bio-rational Insecticides on Some Biological Aspects of the Egyptian Cotton Leafworm Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae). Plant Protect. Sci., 44: 147–154.
22. Pantani, C., Ghetti, P. F., Cavacini, A. and Muccioni, P. 1990. Acute Toxicity of Equitoxic Binary Mixtures of Some Metals, Surfactants and Pesticides to the Freshwater Amphipod Gammarus italicus Goedm. Environ. Technol., 11: 1143-1146.
23. Shivankar, S. B., Magar, S. B., Shinde, V. D., Yadav, R. G. and Patil, A. S. 2008. Field Bio-efficacy of Chemical, Botanical and Bio-pesticides against Spodoptera litura Fab. in Sugarbeet. Annal. Plant Protec. Sci. 16: 312-315.
24. Wills, G. D. and McWhorter, C. G. 1982. The Effect of Adjuvants on Biological Activity of Herbicides. 5th Int. Conf. Pestic. Chem., 1: 289-294.
Journal of Agricultural Science and Technology
Volume 17, Issue 6
November and December 2015
Pages 1539-1549