Unique biochemical and molecular biological mechanism of synergistic actions of formamidine compounds on selected pyrethroid and neonicotinoid insecticides on the fourth instar larvae of  Aedes aegypti  (Diptera: Culicidae)

Ahmed, Mohamed Ahmed Ibrahim; Vogel, Christoph F.A.; Matsumura, Fumio

doi:10.1016/j.pestbp.2015.01.008

Cited by 16 publications

(6 citation statements)

References 18 publications

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“…Several studies reported that formamidine acaricides (amitraz and chlordimeform) effectively synergize toxic action of certain pyrethroids (deltamethrin, permethrin, cypermethrin, and phenothrin) and neonicotinoids (imidacloprid, thiamethoxam, and dinotefuran) in some insect species (Ahmed & Matsumura, 2014;Ahmed et al, 2015) and mites such as T. urticae (El-Sayed & Knowles, 1984). However, inappropriate pesticide combinations would cause an antagonistic effect.…”

Section: Discussionmentioning

confidence: 99%

Toxicity, joint action effect, and enzymatic assays of abamectin, chlorfenapyr, and pyridaben against the two-spotted spider mite Tetranychus urticae

Badawy

Mahmoud

Khattab

2022

JoBAZ

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Background In the present study, the comparative toxicity of three different acaricides (abamectin, chlorfenapyr, and pyridaben) in technical and formulated forms was assessed on the eggs and adult females of a susceptible strain of Tetranychus urticae. Joint toxic effects of the tested acaricides were also performed against eggs and adults. In addition, the in vitro assay of the tested acaricides was evaluated against some target enzymes isolated from the adult females. Results The LC50 values against eggs by leaf-disk-dip technique were estimated to be 294.27, 1032.93, and 9550.54 mg/L for abamectin, chlorfenapyr, and pyridaben, respectively. However, the LC50 values were 783.06, 666.55, and 731.36 mg/L for the formulations Agromectin, Challenger, and Sanmite, respectively. Abamectin was found to be the greatest lethal to the adults (LC50 = 5.39 mg/L) followed by chlorfenapyr (LC50 = 106.51 mg/L) after 24 h of the treatment by slide-dip technique. Pyridaben was least toxic (LC50 = 690.23 mg/L). Agromectin (LC50 = 0.94 mg/L) followed by Challenger (LC50 = 73.65 mg/L) while the Sanmite was the lowest toxic one (LC50 = 1160.60 mg/L) against the adults. The results of joint toxic action proved that all combinations between the technical or formulated acaricides exhibited potentiation effect and the toxicity was increased significantly against eggs and adults of T. urticae compared to the individual pesticide. The activity of acetylcholinesterase (AChE), adenosine triphosphatase (ATPase), acid and alkaline phosphatases (ACP and ALP), carboxylesterase (CaE), gamma-aminobutyric acid transaminase (GABA-T), and glutathione-S-transferase (GST) isolated from adults treated with 0.025, 0.05, 0.1, 0.5, 1, and 5 mg/L were significantly inhibited compared to the control. Conclusion This study provides the theoretical basis for a rational application of abamectin, chlorfenapyr, and pyridaben mixtures in T. urticae control.

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Section: Discussionmentioning

confidence: 99%

Toxicity, joint action effect, and enzymatic assays of abamectin, chlorfenapyr, and pyridaben against the two-spotted spider mite Tetranychus urticae

Badawy

Mahmoud

Khattab

2022

JoBAZ

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“…The joint toxicity of binary insecticide mixture is dependent on insecticide species. 39 For example, formamidine pesticides [39][40][41][42] effectively synergized toxicity effects of certain neonicotinoids 40 and pyrethroids [40][41][42] in several insect species, such as Apis mellifera, 39 Aedes aegypti, 40 Musca domestica, 41 and Tetranychus urticae. 42 In contrast, inappropriate insecticide mixtures including chlordimeform-parathion, 43 organophosphates-carbamates 44 and spinosad-bifenazate, 45 caused antagonistic effects against Blatella germanica, 43 T. urticae, 44 and Frankliniella occidentalis, 45 respectively.…”

Section: Discussionmentioning

confidence: 99%

Control efficacy and joint toxicity of thiamethoxam mixed with spirotetramat against the Asian citrus psyllid, Diaphorina citri Kuwayama

Tang

Zhao²,

Wang

et al. 2020

Pest Management Science

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BACKGROUND: The Asian citrus psyllid (ACP), Diaphorina citri Kuwayama, is one of the most devastating pests in citrus orchards, and has caused huge economic losses worldwide. Chemical control is the most effective way for psyllid control. Herein, the toxicity of nine insecticides to ACP adults and the joint action of thiamethoxam + spirotetramat were determined by a topical application method in the laboratory; field plot experiments were conducted to evaluate the control efficacy of one self-made thiamethoxam + spirotetramat 40% suspension concentrate (SC) comparing with thiamethoxam 21% SC, spirotetramat 22.4% SC, tolfenpyrad 15% SC and bifenthrin 100 g/L emulsifiable concentrate against ACP using foliar sprays in 2018-2019. RESULTS: The highest toxicity to ACP adults was achieved by beta-cyfulthrin, bifenthrin, thiamethoxam and acetamiprid, with median lethal doses of 0.247 to 1.382 ng/adult at 24 h after treatment. High toxicity was observed by chlorpyrifos, spirotetramat and tolfenpyrad, but moderate toxicity by pyriproxyfen and buprofezin. For mixutres of thiamethoxam and spirotetramat, a 25:15 mass ratio showed the highest synergistic effect, with a co-toxicity coefficient (CTC) of 246.52; while a 10:30 mass ratio exhibited an additive effect, with a CTC of 109.84. Thiamethoxam + spirotetramat 40% SC at 60-80 mg/kg can effectively control ACP with a control efficacy of 72.92 to 99.29% during 3-30 days. Moreover, foliar sprays of all tested insecticides at the tested rates had no phytotoxic effects on citrus trees. CONCLUSION: A one-time foliar spray of thiamethoxam + spirotetramat 40% SC at 80 mg/kg could be recommended to control ACP during its infestation period in citrus groves.

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“…Classification of molecules under study per mechanism (s) of action permits to take into account potential additive [17][18], synergistic or counteracting cocktail effects [18][19].…”

Section: Cocktail Effectmentioning

confidence: 99%

Endocrine Disruptor Compounds (EDC) Effects on Reproduction

Nguyen¹

2018

IJDE

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A large number of industrial chemical products (paints, flame retardants, pharmaceuticals, pesticides) are suspected or proved to act as endocrine disruptor compounds (EDCs). In the present survey of the literature, the main issue is to consider how to classify individual products as EDC or not. In this perspective, the different mechanisms leading to endocrine disruption are described: either by direct interaction with hormone receptors leading to its stimulation or inhibition, or by effect on endogenous hormone concentration through stimulation or inhibition of its synthesis or its degradation, or its binding to transport binding proteins. The present review takes particularly in consideration the effects of EDCs on the endocrine control of Reproduction in human and animals. Indeed, a number of EDCs can act as anti-androgens, anti-estrogens, and steroidogenic enzyme inhibitors that interfere with steroid action or production and thus can alter reproductive health.

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Unique biochemical and molecular biological mechanism of synergistic actions of formamidine compounds on selected pyrethroid and neonicotinoid insecticides on the fourth instar larvae of Aedes aegypti (Diptera: Culicidae)

Cited by 16 publications

References 18 publications

Toxicity, joint action effect, and enzymatic assays of abamectin, chlorfenapyr, and pyridaben against the two-spotted spider mite Tetranychus urticae

Toxicity, joint action effect, and enzymatic assays of abamectin, chlorfenapyr, and pyridaben against the two-spotted spider mite Tetranychus urticae

Control efficacy and joint toxicity of thiamethoxam mixed with spirotetramat against the Asian citrus psyllid, Diaphorina citri Kuwayama

Endocrine Disruptor Compounds (EDC) Effects on Reproduction

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