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The research was conducted for the years 2019-2020 at laboratory of Plant Protection Department in Dongola- Northern State- Sudan. The cowpea beetle insect prefer egg laying on walsem lubia, prefer feeding on cowpea lubia than the other three legume types tested, Percentage weight loss due to this insect pest increased by increasing storage period, Cowpea is more susceptible to this insect than the other three legume types while faba bean is more resistant to it, Number of eggs laid/female significantly reduced by increasing neem seed powder doses while its control significantly increased by increasing neem seed powder doses. Neem seed powder at 28 g was the best treatment, which gave lowest number of eggs and highest control.

The competition experiment was conducted for two consecutive summer seasons (2014, 2015) at Altraa village, Sharg Elneel Unit, Dongola Locality, Northern State - Sudan, located within latitude 16° and 22° N and longitude 20° and 32° E., to determine fresh pod yield loss due weed competition and to determine critical period of weed control in okra vegetable. Okra variety, khartuomia, was sown on 23 February in both summer seasons. This research comprised 12 treatments which arranged in randomized block design, with four replicates. The crop was kept weed-free for the first 2, 4, 6, 8, 10 weeks after crop sowing and then remained weedy till harvest or kept weedy for the same periods and then remained weed-free till harvest. Weed free and weedy treatments till harvest were included as controls for comparison. Broad-leaved weeds were predominant in the experimental site. Combined analysis of both summer seasons showed that, growth components were significantly reduced by weed competition under full season weed infestation treatment. Combined analysis of both summer seasons indicated that, unrestricted weed growth significantly reduced fresh pod yield (kg/fed) by 72.81% and this reduction mainly affected by the duration of weed competition, whereas the okra vegetable fresh pod yield increased when the duration of weed competition decreased. Also combined analysis of both summer seasons showed that, the critical period for weed control in okra vegetable according to this investigation was between 6 and 8 weeks after sowing.