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The experiment was conducted in the store of Plant Protection Management in Dongola- Northern State- Sudan. This experiment was carried out in two successive season's summer and winter seasons (hot and cold months) during crop storage period of the years (2023-2024).The experiment aimed at studying the efficacy of three concentrations (5-10-15g.) of each treatment leaves powder of three plantsspecies. i.e. basil Ocimum basilicum, argel Solenostemma argel (Del.) and neem Azadirachta indica with commercial variety of wheat (Imam) as repellents plants to influence the density of the khapra beetle Trogoderma granarium and estimate the weight loss resulting from the feeding of the different stages of the insect on treated grains of wheat in comparison with untreated control. Data analysis showed high significant differences on means of weight loss between different treatments (5.64**) and between months (14.74**). Generally, neem, argel and basil at highest rate treatments showed significantly less weight loss compared to untreated control. Also data showed low means numbers (high losses) of weight loss in March, April and May months compared to the other months. This indicated that the argel, neem and basil at highest rate were the best treatments. Good control of insect damage was shown in neem (106.30), basil (104.60) and argel (103.50) treatments at highest rate followed by argel (99.69), basil (98.97) and neem (98.21) at second rate respectively. The results indicated that all treatments were apparently very effective against the khapra beetle compared to the untreated control. Based on statistical analysis showed that all treatments potential of efficacy was only expressed at the higher rates (15g.) followed by the second rates (10g.) and the lowest rates (5g.) respectively. The data showed that, neem at the highest rate (15g.) treatment was more effective in controlling khapra beetle. The weight loss started low in august (112.60), September (105.30), October (103.20), November (102.00) and December (100.53) months, then increased progressively on other months. Low means numbers (high losses) of weight loss in May (92.86), April (93.43) and March (94.64) compared to the other months. Data indicated the superiority of neem at highest rate over basil and argel which gave higher weight loss in wheat grains in both hot (106.70), and cold months (105.87) respectively. Data of both seasons revealed that neem remained the significantly leading repellent plant in reducing the numbers of insect and subsequently the weight loss in wheat grains particularly during hot months compared to the other treatments. However, weight loss in wheat grains was significantly low in hot months than those in the cold months.
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