THE INFLUENCE OF TREATMENTS WITH INSECTICIDES APPLIED TO MELLIFEROUS RAPE CULTURE ON THE HONEYBEES GATHERING ACTIVITY PUBLISHEDAlin JIVAN, Valeriu TABĂRĂ, Antonina RIŞCU (JIVAN)
These researches have been conducted to demonstrate the toxicity of chemicals in the field for bees. They are not novelty but on the other hand they are of paramount importance, since they complete the previous observations in the field. Substances that have been used are not new and in all years of observations there have been problems in the aspect of their impact on honey bees. The aim was to observe the insecticide toxicity to bees, because both substances used had devastating impact on families of bees that collected nectar and pollen from the field in the day the insecticide was sprayed on the rape culture. By statistically processing the data it can be observed that in the first monitoring week of the three variants analysed there are no significant differences in the average of the collecting bees. From a biological point of view this is a normal phenomenon, thus bee families under study had a uniform degree of development, until the moment the rape culture treatment was applied, i.e. insecticide for combating pests. In the second and the third week of monitoring, there are big statistical differences between the witness and the two variants. The witness had a constant value of around 300 bees followed by a growth of 450 bees. In the case of the latter variants, where insecticide treatments had been applied, the average of bee numbers, in the same period, at hives in the two localities, was a lot smaller (180 bees) as compared to witness locality (320 bees). Between variants L1 and L2 i.e. localities Comlosul Mic and Teremia Mare, data shows that there is a slight significance, insecticides used for conducting activities have disturbed the bees collected from both locations. In the second locality in the third week of observations, there was a shortage of bees, with an average of 110 bees. This number is very small compared to the witness where there were identified 370 bees in the third week.
honeybee, identified, gathering, toxicity