The present study was carried out throughout the two successive seasons of 2018/2019 and 2019/2020 at Nubaria region, Behaira Governorate, Egypt. Results revealed that during the first season (2018/2019), the general mean of reduction percentages throughout the whole inspection period showed that profenofos and spintoram were the most effective treatments against P. mixta which infest sugar beet where the highest general mean of reduction percentage were 92.43% and 83.22% reductions, followed by reductions of 66.76%, 62.10% and 58.57% for azadirachtin, Tuflobenzuron and Emamectin benzoate,, respectively, without significant variations. The least effective was diazinon 42.43, Indoxacarb 30.08, Lambda-Cyhalothrin 28.81%, and thiamethoxam 12.43%, subsequently, without significant differences. Moreover, in the second season (2019/2020), the highest general mean of reduction percentage showed profenofos and spintoram recorded the highest general means of 91.55%, and 68.36% reductions, successively, followed by mean reductions of 65.08%, 64.44%, and 52.2% for Emamectin benzoate, Diazinon, and tuflobenzuron, respectively, without significant variations. The least effective ones have corresponded to Azadirachtin 48.27%, Indoxacarb 24.67%, Lambda-Cyhalothrin 16.24%, and thiamethoxam (11.55%) subsequently, with significant differences.
The economics and profits were calculated for some insecticides singly to give comparatively high yields compared to the control. The insecticide of Spintoram, indoxacarb, and Azadirachtin gave high root yields of 40, 39, and 39 ton/fed, in respect, on average, especially the insecticide of Spintoram represented the highest production of sugarbeet yield and the averages of top yields were 7, 6 and 6 kg/fed for the insecticide of spintoram, indoxacarb, and azadirachtin, respectively. Spintoram gave the highest (L.E. 25390) net returns/fed. and subsequently indicated the utmost profit of one Egyptian pound of L.E 9.26. Azadirachtin recorded L.E. 23902 and L.E. 7.39 for the net returns/fed. and the profits of one Egyptian pound investment, in sequence, compared to the untreated check.