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Mixture effects of thiamethoxam and seven pesticides with different modes of action on honey bees (Apis mellifera)
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Mixture effects of thiamethoxam and seven pesticides with different modes of action on honey bees (Apis mellifera)
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Journal Article
Mixture effects of thiamethoxam and seven pesticides with different modes of action on honey bees (Apis mellifera)
2023
Overview
Even though honey bees in the field are routinely exposed to a complex mixture of many different agrochemicals, few studies have surveyed toxic effects of pesticide mixtures on bees. To elucidate the interactive actions of pesticides on crop pollinators, we determined the individual and joint toxicities of thiamethoxam (THI) and other seven pesticides [dimethoate (DIM), methomyl (MET),
zeta
-cypermethrin (ZCY), cyfluthrin (CYF), permethrin (PER), esfenvalerate (ESF) and tetraconazole (TET)] to honey bees (
Apis mellifera
) with feeding toxicity test. Results from the 7-days toxicity test implied that THI elicited the highest toxicity with a LC
50
data of 0.25 (0.20–0.29) μg mL
−1
, followed by MET and DIM with LC
50
data of 4.19 (3.58–4.88) and 5.30 (4.65–6.03) μg mL
−1
, respectively. By comparison, pyrethroids and TET possessed relatively low toxicities with their LC
50
data from the range of 33.78 (29.12–38.39) to 1125 (922.4–1,442) μg mL
−1
. Among 98 evaluated THI-containing binary to octonary mixtures, 29.59% of combinations exhibited synergistic effects. In contrast, 18.37% of combinations exhibited antagonistic effects on
A. mellifera
. Moreover, 54.8% pesticide combinations incorporating THI and TET displayed synergistic toxicities to the insects. Our findings emphasized that the coexistence of several pesticides might induce enhanced toxicity to honey bees. Overall, our results afforded worthful toxicological information on the combined actions of neonicotinoids and current-use pesticides on honey bees, which could accelerate farther comprehend on the possible detriments of other pesticide mixtures in agro-environment.
