Plant Breeding and Genetics 45 Biotechnology 39 Genetic Engineering, Gene Transfer and Transgenics, (New June 2002) 36 History 33 Molecular Biology and Molecular Genetics, (Discontinued March 2000, Reinstated and Revised June 2002) 33 Biotechnology (General), (Revised June 2002) 29 Plants 27 Genetically engineered organisms 24 Philosophy 24 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 22 Plant breeding 21 Plant diseases 21 Plant Pests, (New March 2000) 20 Plant Physiology and Biochemistry 20 Plant Production 20 Transgenic plants 20 Field Crops, (New March 2000) 19 Genetic engineering 19 Horticultural Crops, (New March 2000) 18 Plant pests 18 Crop Produce 17 Horticulture 16 Taxonomy and Evolution 16 Agricultural Economics 15 Genetics 15 Soil Water Management (Irrigation and Drainage), (Revised June 2002) 15 Tuber crops 15 Animal Genetics and Breeding, (New March 2000) 14 Funeral rites and ceremonies 14 Cassava 13