By H. A. Steppler, P. K. R. Nair
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Extra resources for Agroforestry: A Decade of Development
The ICRAF research strategy in relation to plant science research in agroforestry. In P. A. ), Plant Research and Agroforestry. Nairobi: ICRAF. Torres, F. 1987. The ICRAF approach to international co-operation. Agroforestry Systems 5: 395-410. G. 1986. Multipurpose tree and shrub seed directory. Nairobi: ICRAF. J 987. Agroforestry training and education at ICRAF: Accomplishments and challenges. Agroforestry Systems 5: 353-374. SECTION TWO Perspectives on agroforestry The promise of agroforestry for ecological and nutritional security M.
Diversity in agroforestry systems is very important for their ecological sustainability. Extensive plantations with a single strain of Leucaena leucocephala in the Philippines and elsewhere has led to severe psyllid pest epidemics, damaging more than 50 percent of the trees (Lapis, 1986). Brewbaker (1985, this volume), drew attention to the genetic vulnerability to pest attack of single variety plantations of Leucaena leucocephala. Similarly, overdependence on a single genotype of the stem-nodulating Sesbania rostrata may lead to pest and disease outbreaks.
Proceedings of an Expert Consultation, Nairobi: ICRAF. , J. T. A. Navaro. 1984. Report of the External Review Panel of the International Council for Research in Agroforestry, September-December, 1984. Nairobi: ICRAF. P. 1976. Losing ground: Environmental stress and world food prospects. New York: Norton and Co. M. R. Nair. 1986. An evaluation of the structure and function of some tropical homegardens. Agricultural Systems 21: 179-210. R. 1959. Plant exploration and the reach for superior germ plasm for grasslands.