The main propose of this research was the observation of bees returning from the colza culture to the hide with pollen depending on the hoer. In the period April-may 2007 5 bee families out of the own bee culture where studied on their behavior during the blooming period of the colza culture, the aspect that the culture was treated with Friponil insecticide (Regent) for the insects combat (Athalia Rosae and Meligethes aeneus). During the 3 days of counting bees, they had a normal behavior in the hide till the colza was treated, the maximum number of bees counted was  of 562 for the first week during the interval 9:15-9:30 at the family number 2 and in the second week 580 at the sane family and in the same time period, and after the 6 th day of treatment another research was made and the conclusion was that in all the hides the number of bees coming in from the fields was very low, maximum 60 bees at the bee family number 1 during 9:15 - 9:30 during the afternoon no bee was observed coming in with pollen. Now we can affirm that the Fipornil insecticide (Regent) is extremely harmful as well for the nectar collecting bees as well as for the pollen collecting bees, their def occurred after short time. Because this insecticide is causing extreme damage to the bee families, this has to be replaced with products without, or with less toxicity factor. In this domain there where many researches made, but none of them was centered on the number of bees coming with pollen in the hide after the culture has been treated.The originality of the research consists in the way of the research that is the number of bees and the measurement of the surface with offspring razed up by the bee families during this period. I give bug attention to this work because trough this kind of research there can be proofed if a product is toxic for the bees or not.

substances; bee; research; numbering; depopulation

Presentation: oral