Search Results

You are looking at 1 - 3 of 3 items for

  • Author: Amin Sadeghi x
Clear All Modify Search
Open access

Amin Sadeghi, Ali-Akbar Mozafari, Reza Bahmani and Kamran Shokri

Abstract

The aim of this study was to determine the levels of these elements: Hg, Ba, Ca, Fe, Mn, Li, As, Na and K in the bodies of bees. Honeybee samples were randomly collected from apiaries located in four counties of the province of Kurdistan. The four counties were: Marivan, Bijar, Kamyaran and Ghorveh. The data obtained from this study showed that K had the highest concentration, followed by Na, Ca, Hg, Ba, Fe, Mn, Li and As. From among all the sites, there were no significant differences recorded between the concentrations of the different metals. The results did show that three minerals groups were able to be differentiated: elements that were very abundant, elements in a medium concentration, and trace elements. The first group consisted of K and Na, with a range from 41.857 to 47.871, and 12.653 to 16.183 ppm, respectively. The second mineral group was composed of Ca, Hg, Ba, and Fe, where Ca was the most abundant element (with a range of 9.077 to 10.058 ppm), followed by Hg (1.12-4.786 ppm), Ba (2.881-3.481 ppm), and Fe (1.050-1.727 ppm). The third mineral group was composed of Mn, Li and As. They ranged from 0.262 to -0.399, and from 0.043 to 0.101, and from 0.017 to 0.068 ppm, respectively.

Open access

Farhang Rasuli, Javad Nazemi Rafie and Amin Sadeghi

Abstract

The honey bee is credited with approximately 85% of the pollinating activity necessary to supply about one-third of the world’s food supply. Well over 50 major crops depend on these insects for pollination. The crops produce more abundantly when honey bees are plentiful. Worker bees are the ones primarily affected by pesticides. Poisoning symptoms can vary depending on the developmental stage of the individual bee, and the kind of chemical employed. The oral toxicity of these insecticides: (phosalone and pirimicarb), acaricide (propargite), insecticide and acaricide (fenpropathrin), fungicides, and bactericides (copper oxychloride and the Bordeaux mixture), were evaluated for the purposes of this research. The results showed that fenpropathrin had high acute oral toxicity (LC50-24h and LC50-48 were 0.54 and 0.3 ppm, respectively). Propargite had 7785 ppm (active ingredient) for LC50-24h and 6736 ppm (active ingredient) for LC50-48h in honeybees and is therefore, non-toxic to Apis mellifera. On the other hand, copper oxychloride had minimum acute oral toxicity to honeybees (LC50-24h and LC50-48 were 4591.5 and 5407.9 ppm, respectively) and was therefore considered non-toxic. Also, the Bordeaux mixture was safe to use around honeybees. Phosalone and primicarb were considered highly and moderately toxic to honeybees, respectively.

Open access

Farhang Rasuli, Javad Nazemi Rafie and Amin Sadeghi

Abstract

Pollination has an important role in both agricultural production and wild plant reproduction. For the pollination of crops, agriculture relies largely on managed colonies of the honeybee Apis mellifera. Worker bees are primarily affected by pesticides. The symptoms of poisoning vary depending on the developmental stage of the individual bee and kind of chemical employed. The acute contact toxicity of insecticides (phosalone and pirimicarb), acaricide (propargite), insecticide and acaricide (fenpropathrin), fungicides and bactericides (copper oxychloride and bordeaux mixture) was assessed in Iran through laboratory experiments. The median lethal concentrations (LC50-24h, LC50-48h and LC50-72h) were evaluated for the purposes of this research. Results showed that fenpropathrin had high toxicity; LC50-24h, LC50-48h and LC50-72h were 5.7, 3.2 and 2.9 ppm respectively. Additionally, the bordeaux mixture had the minimum contact toxicity on honeybees with LC50-24h, LC50-48h and LC50-72h being 79,926; 69,552 and 69,045 ppm respectively and was safe and non-toxic in honeybees.