This research was conducted to study the effects of climate variables such as rainfall, temperature, and relative humidity on cowpea yield, and evaluated in Gombe State, Nigeria, during the period of 2009 to 2018 (one decade). The ex-post facto research design was adopted for the study, utilizing secondary data obtained from meteorological and agronomic data collected from the Metrological Office and agronomic data from the Ministry of Agriculture, Gombe State. Both data were collected and analysed using analysis of variance (ANOVA), Pearson Product Moment Correlation and Simple Linear regression. The study found that there is a negative relationship between rainfall, relative humidity and area of land/ha, while a positive relationship existed for temperature and cowpea yield over the period under study decade. The study revealed that all the parameters-rainfall temperature, relative humidity contributes 61% to climate variation in the study area. The study among others recommended that cowpea farmers should adopt new measures such as early planting, use of resistant varieties, contour farming to conserve water and supplementary irrigation to cope with the negative effects of climate change on cowpea yield and increases cowpea production in Gombe State, Nigeria.
The efficacy of maize varieties and Lambdacot 500EC concentrations were assessed on the damage caused by maize stem borer (Busseola fusca Fuller) (Lepidoptera: Noctuidae) on maize during 2015 and 2016 cropping seasons. The experiment was a split-plot design with Lambdacot 500EC concentrations (0.5 , 1.0 and 1.5 l/ha) as the main plots and three maize varieties (SAMMAZ 14, DMR-LSR-Y and BR9943-DMR-SR-W) as the sub-plots on a plot size of 3.0 m x 4.0 m replicated three times. Maize plants were sprayed with the different Lambdacot 500 EC concentrations at 4 and 6 weeks after planting (WAP) The results obtained showed that lowest number of maize plants with leaf sheath pin-holes, dead hearts, and stem tunnels and cobs damage by larvae were recorded on SAMMAZ 14 and DMR-LSR-Y while BR9943-DMR-SR-W had the highest. Maize plants treated with Lambdacot 500EC at 1.0 l/ha and 1.5 l/ha had lowest leaf sheath pinholes, dead hearts, stem tunnels and cob damage while untreated maize plants had the highest damage. The highest maize grain yields was recorded on SAMMAZ 14 and DMR-LSR-Y on 1.0 l/ha and 1.5 l/ha concentrations. This study recommended SAMMAZ 14 and DMR-LSR-Y obtained from IAR treated with Lambdacot 500 EC at 1.0 l/ha and 1.5 l/ha concentrations to maize farmers in the study area.
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