الفهرس 
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Abstract
Insect pollinators provide an essential ecosystem service namely pollinations. Pollinating insects are facing threats on an unprecedented scale that are in decline. Honey bee A. mellifera comprise nearly 68% of the effecting insect pollinating fauna. The decline of the honey bee across the world knows as colony collapse disorder. Pesticides including neonicotinoides are one of the main causes of this phenomenon. The main objectives and results of the current study are presented as follow: 1) Diversity and activity of flower-visiting insects associated with broad bean plants in Ismailia Governorate. A. mellifera was remarkably active as a key pollinator of broad bean plants compared to the other pollinators, 2) Impact of insecticide application on the activity of main flower-visiting insects associated with broad bean. Data indicated a significant decrease in the daily activity of all insect visiting broad bean flowers post insecticide application compared to their activity before application, and that decline continued until the end of the blooming season, 3) Toxicity of selected insecticides on honeybee workers. Results revealed that neonicotinoids insecticides differed in their toxicity to bee workers, as Actara was the most toxic one. Calypso comes in the second order of neonicotinoides in toxicity after Actara, followed by Clipper insecticide. The toxicity index values showed superior efficiency of Actara at LC50 (100%), followed by Radiant (22.46%), Malathion (2.45%), Calypso (1.26%) and Clipper (0.9%). Slopes of linear regression equations caused upward trend in all insecticides treatments and Malathion had the steepest toxicity line, whereas Clipper had the flattest one. The calculated coefficient of determination (R2) revealed greatest effects of insecticide concentrations on the susceptibility of honey bee workers as the bee mortality increased with the increase of insecticide concentrations irrespective of insecticide used and time intervals post treatment, 4) Olfactory learning behavior of A. mellifera workers. Results showed impaired effects on the learning ability of honeybee represented in the degree and number of proboscis extension response, as