Variety/Cultivar 38
Vector 57, 86 , 87, 109, 124, 163
Vegetables221–243
Vegetative reproduction 40–41
Vermifuge/Anthelmintic 229
Vernalisation 59 , 133, 134, 144
Vetch/Grass Pea/Chickling Pea
Lathyrus sativus186–188
Virus diseases 86–87
Vitamin C 112, 157, 204, 209, 212,
217, 218, 223, 232, 238 , 253, 256,
257, 262, 264
Vitaceae (Grape family) 244
Volunteer plants 45 , 69, 80, 87, 210
Water rights 94
Water table 11, 12, 15
Weaver bird Quelea137, 138
Weeds 88–92
WheatTriticum aestivum 4, 21, 33,
53, 105, 107, 126, 133, 143–149,
193
Wild Rice Zizania aquatica 128, 221,
267, 290
Wilting 39
Windbreak 11
Windrow 73
Winged Bean (Four-angled Bean)
Psophocarpus tetragonolobus
284–287
Winged Pea/Asparagus PeaLotus
tetragonolobus 284
Winter varieties 59
Witchweed—see Striga
Yam Dioscorea spp. 217–220
Yield 76
Zinc 24, 26, 27
Tung/Mu-Tree/Noix d’abrasin
Aleurites montana 189
Turgidity 9
UllucoUllucus tuberosus 204
Umbelliferae (Carrot family) 221, 226
Underexploited Crops 266–287
WatermelonCitrullus lanatus 243,
264–266