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Laboratory and glasshouse trials were used to determine the response of maize plants to varied moisture levels under Striga lutea infestation. Six moisture levels (1.5, 2.0, 2.5, 3.0, 3.5 and 4.0 ml) were applied to striga seed for germination count in the laboratory, while five moisture levels (300, 600, 900, 1200 and 1500 ml) were applied to two maize varieties infested with Striga lutea to assess their tolerance to striga in the glasshouse. The results showed decline in striga germination counts with increased moisture supply in the laboratory and daily moisture application. Supply of 2.00 ml of moisture seemed enough for optimum striga germination. Results from a glasshouse trial also showed significant effects of moisture on striga and maize agronomic characters, except for maize flag leaf length and grain yields. The maize varieties also differed significantly for striga syndrome rating, plant height, and maize grain yield, while variety × infestation as well as variety × moisture differed significantly for almost all the traits assessed. The interactive effects of variety × moisture were significant for all variables except grain yield. Similarly, gradual increase in striga emergence at higher moisture levels from 1.3 (300 m1) to 52.0 (1500 ml) were recorded. Striga syndrome ratings were significantly reduced with increased moisture, thereby enhancing higher grain yield. The use of striga- resistant genotypes in addition to adequate soil moisture will probably boost maize production in striga-endemic areas. Les essais de laboratoire et de serre se sont deroules a l'Institut de Recherche et de Formation Agricole, Universite d'Obafemi Awolowo, Plantation de Moor, Ibadan, Nigeria. Le but etait de determiner la reaction des plantes de mais aux niveaux differents d'humidite sous l'infestation de Striga lutea. Six niveaux d'humidite (1.5, 2.0, 2.5, 3.0, 3.5, et 4.0 ml) sous une situation de laboratoire, etaient appliques aux graines de Striga pour le compte de germination, alors que cinq niveaux d'humidite (300, 600, 900, 1200 et 1500 ml niveaux d'humidite) sous condition de serre etaient appliques aux deux varietes de mais infestees de Striga lutea pour l'evaluation de leur tolerance au Striga. Les resultats montraient une baisse des comptes de germination de Striga avec une augmentation en provision d'humidite sous condition de laboratoire et d'application d'humidite quotidiennement. Provision de 2.00 ml d'humidite semble etre suffisant pour la germination optimale de Striga. Les resultats de l'essai d'une serre montraient aussi des effets considerables d'humidite sur striga et les caracteres agronomiques de mais sauf l'iris de mais, longueur de feuille et les rendements de grains. Les varietes de mais aussi differaient considerablement pour l'estimation de syndrome de striga, taille de plante et le rendement de grain de mais, alors que variete × infestation ainsi que variete × humidite differaient considerablement pour presque tous les traits evalues. Les effets interactifs de variete × humidite etaient considerables pour toutes les variables sauf le rendement de grain. De la meme facon, les augmentation graduelles de l'emergence de Striga aux niveaux d'humidite plus elevee de 1.3 (300 ml) a 52.0 (1500 ml) etaient enregistrees. Les estimations de syndrome de Striga etaient considerablement reduites avec l'augmentation d'humidite ameliorant de cette facon le rendement plus eleve de grain. L'utilisation de genotypes resistants au Striga en plus d'humidite adequate du sol pourrait probablement accroitre la production de mais dans les zones endemique de Striga. Ghana Journal of Agricultural Science Vol. 39 (1) 2006: pp. 3-10

Response of maize (<i>Zea mays</i> L.) to varied moisture levels under <i>Striga lutea</i> (Lour) infestation in Nigeria