Summary
Evaluation of the combined effect of crop spacing, cassava variety and different weed control methods on the density of M. invisa in cassava field was conducted at Umudike, Southeastern Nigeria during 2015 and 2016 cropping seasons. The study was laid out in split-split plot in randomized complete block design with three replications. The main plot treatments consisted of three crop spacing (1 m × 0.6 m, 1 m × 0.8 m, and 1 m x 1 m). The sub-plot treatments included two cassava varieties of contrasting morphology (TME 419 and NR 8082) while the sub-sub-plot treatments were four weed control methods (W1 – hoe weeding at 4, 8 and 12 weeks after planting), (W2 – S-metolachlor (1160 g/ha) + atrazine (1480 g/ha) applied pre-emergence followed by hoe weeding at 12 and 16 WAP), (W3 – S-metolachlor
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