Neonicotinoid insecticides hinder the pupation and metamorphosis into adults in a crabronid wasp

Abstract

neonicotinoid insecticides are associated with a decline in the diversity and distribution of bees and wasps (Hymenoptera: Aculeata). The effects of neonicotinoids on the metamorphosis of aculeates have never been addressed in detail; however, recent evidence suggests that neonicotinoids induce wing abnormalities. We hypothesized that the metamorphosis success of bees and wasps differs in response to contact exposure to field-realistic concentrations of neonicotinoid insecticides or in response to combined exposure to neonicotinoid insecticides and benzimidazole fungicides. We treated prepupae of the model crabronid wasp Pemphredon fabricii with field-realistic concentrations of four neonicotinoids, acetamiprid, imidacloprid, thiacloprid and thiamethoxam, and/or with the benzimidazole fungicide thiabendazole. Treatment with acetamiprid or imidacloprid decreased the pupation rates to only 39% and 32%, respectively. Treatment with thiacloprid or thiamethoxam did not affect the pupation rate when applied alone, but the subsequent treatment of thiacloprid-or thiamethoxam-treated prepupae with thiabendazole led to significant decreases in pupation rates. A high concentration of acetamiprid, which severely affected the pupation rates, had moderate effects on metamorphosis into adults, resulting in 53% metamorphosis success (as opposed to 95% metamorphosis success in the water-treated group). However, imidacloprid or thiamethoxam treatment resulted in only 5%-10% metamorphosis success into adults. overall survival decreased in response to treatment with any of the neonicotinoids or benzimidazoles or their combinations, with extremely low survival (<2%) following combined treatment with imidacloprid and thiabendazole or thiamethoxam and thiabendazole. In conclusion, neonicotinoids alter insect metamorphosis success, which can be further potentiated by their combination with other agrochemicals, such as benzimidazoles.

Simulating immunosuppressive mechanism of Microplitis bicoloratus bracovirus coordinately fights Spodoptera frugiperda

“…eIFs dsRNA inhibits the synthesis of many major proteins and ultimately affects the life cycle of armyworm. Similar to the altered life-cycle of crabronid wasp due to the blocking of the neurotransmitter acetylcholine by acetamiprid ( 45 ), the blocking of small molecules transmission between insect cells by Inxs dsRNA affects the communication between cells and ultimately alters the life-cycle of armyworm.…”

Stable Indium Pyridylcarboxylate Framework with Highly Selective Adsorption of Cationic Dyes and Effective Nitenpyram Detection

“…Not only are organic dyes harmful to the environment, but with the development of agriculture, pesticides used in large quantities for the yield of crops have also caused a certain burden to the environment. , Compared with traditional types of insecticides, neonicotinoid insecticides, with the advantages of efficient insecticidal activity and suck ability, have been applied worldwide but result in an increasing number of neonicotinoid insecticides entering the soil. It has been proven that the increase of residues is harmful to beneficial insects, fishes, and human health. − However, considering social and economic development, the use of pesticides cannot be completely prohibited. Therefore, developing sensitive, rapid, and reliable analytical methods are highly demanded to secure our health, food, and environmental safety.…”

Assessing the risk of insecticide exposures on monarch butterflies

“…Based on our observations and review of the insect ecdysis literature, we propose two adverse outcome pathways (AOP) for neonicotinoid-induced AE. We do note AE-like effects were reported by when they chronically exposed monarch larvae to clothianidin-treated milkweed plants, and by Heneberg et al (2020) when they treated crabronid wasp prepupae with neonicotinoids. While these studies are broadly concordant with our observations, they do not provide detailed descriptions of the symptoms or their time course.…”