Journal of Ecology and Rural Environment ›› 2019, Vol. 35 ›› Issue (4): 500-505.doi: 10.19741/j.issn.1673-4831.2018.0137

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Acute Toxicity and Risk Assessment of Nine Insecticides to Honeybees in Oilseed Rape Fields

TAN Li-chao1, CHENG Yan1, ZHU Yu-xuan1, BU Yuan-qing1,2   

  1. 1. Key Laboratory of Pesticide Environmental Assessment and Pollution Control, Nanjing Institute of Environmental Science, Ministry of Ecology and Environment, Nanjing 210042, China;
    2. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • Received:2018-03-21 Online:2019-04-25 Published:2019-04-25

Abstract:

Insecticides are used for the controlling of aphids in oilseed rape fields. To evaluate the effects of insecticides on honeybees(Apis mellifera) in oilseed rape fields, acute toxicities of 9 insecticides were tested. Meanwhile, risk assessment was carried out by risk quotients(RQ) method when the 9 insecticides were applied by spraying. The results showed that:the toxicity levels of 70% imidacridine WG, 10% dimethylamine AS, 25% thiazolazine SC, 5% dithiocarbamate GF and 2.5% deltamethrin EC to honeybees were all at high class. However, the risk levels were different, and the risk of 25% thiazolazine SC, 70% imidacridine WG, 10% dimethylamine AS and 2.5% deltamethrin EC were unacceptable to honeybees. The risk of 5% dithiocarbamate GF to honeybees could be reduced by decreasing the amount and frequency of use. The oral and contact toxicity of 50% pirimicarb WP were moderate and low to honeybees, respectively, and the risk could also be reduced by decreasing the amount and frequency of use. The toxicity levels of 5% acetamiprid EC, 48% thiacloprid SC and 25% pymetrozine SC to honeybees were moderate, low and low, respectively. The risk levels of those insecticides are acceptable. The insecticides with low-risk to honeybees such as thiacloprid and pymetrozine could be priority to control the aphids in oilseed rape fields. In order to decrease the hazard of insecticides on honeybees, it is recommended to avoid using insecticides with high-risk in beekeeping areas and in blooming period of honey source crops.

Key words: insecticides, honeybee, acute toxicity, risk assessment

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