الفهرس 
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Abstract
The present studies were carried out at the experimental farm of Sakha Agricultural Research Station, Kafr El-Sheikh Governorate during the two successive sugar beet seasons, 2018/19 and 2019/20. The results showed that, August plantation attracts the highest average number of S. littoralis and P. solenopsis, while November plantation attracts the highest average number of A. craccivora, N. viridula, P. mixta, C. vittata and S. ocellatella, October plantation attracts the highest average number of M. persicae during the two successive seasons. November plantation during the two seasons exhibited the highest average number of the main associated insect predators. September plantation recorded the highest percentage of parasitism caused by the larval-pupal parasitoid, O. nitidulator during the first season, while in the second season, the highest percentage of parasitism recorded in October plantation. November plantation recorded the highest percentage of parasitism caused by the egg parasitoid, M. nigra and the larval-pupal parasitoid, Tetrastichus sp. during the two successive seasons as parasitoids on the sugar beet beetle Cassida vittata. In the first season, the highest percentage of parasitism caused by the larval parasitoid, Agathis sp. was in August plantation, while in the second season, the highest percentage of parasitism caused by Agathis sp. was in October plantation. For the pupal parasitoid, Diadegma sp., the highest percentage of parasitism was in September plantation during the two seasons. The anti-moulting compounds caused high reduction in S. littoralis larvae and P. mixta population, which was almost the same effect of the chemical insecticides. For C. vittata and S. ocellatella, the anti-moulting compounds proved that to be less efficient in comparison to the chemical insecticides. Sugar beet and fodder beet recorded the shortest immature stages, the shortest larval duration, pupal duration and the highest number of eggs laied by P. mixta or P. hyoscami under laboratory conditions.