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. CropProtectionChemicalsReference; JohnWiley & Sons, New York, 1990. 18. Devakumar, C. and S. Dev: Chemistry; in: Neem research and development, edited by N.S. Randhawa and B. S. Parmar, Society of Pesticide Science, India, 1993, pp 63-96. 19. Donegan, K. K., Schaller, D. L., Stone, J. K., Ganio, L. M., Reed, G., Hamm, P. B. and R. J. Seidler: Microbial populations, fungal species diversity and plant pathogen levels in field plots of potato plants expressing the Bacillus thuringiensis var. tenebrionis endotoxin, Transgenic Res. 5 (1996) 25-35. 20. Douglas H. and P. D. Ross: Methoprene: Its