Insects
·
2022
·Vol. 13
·期 1
·74
·
IF 3.139
Jingrong Hu,Rudoviko Galileya Medison,Seng Zhang,Peifang Ma,Caihua Shi
Simple SummaryBradysia odoriphagais a soil-dwelling insect native to China, and its preferred host is Chinese chives. In this study, non-lethal high-temperature as an important limiting factor to affect the population and development ofB. odoriphagawas assessed. Meanwhile, the physiological mechanism on non-lethal high-temperature to reduce the population was also identified. These would lay a key theoretical foundation for the future development of high-temperature products for environment friendly pest control strategies.AbstractBradysia odoriphagais an agricultural pest in China’s vegetable industry. In this study, pupae and adults were exposed to various non-lethal high-temperatures. The results demonstrated a decreased rate of eclosion once the pupae were exposed to temperatures exceeding 37 °C for 1 h. No effect on the lifespan of unmated female adults was observed after exposure to temperature stress, while unmated male adult lifespan decreased (>37 °C for 2 h). The size of the testis and ovaries for unmated male and female adults decreased, as did the fecundity and egg hatching rate for mated females. Compared with the control group (25 °C), the testis size of unmated male adults decreased after high-temperature stress followed by recovery at 25 °C for 1 h, though the size of the ovaries of female adults did not change. Additionally, the size of the testis and ovaries for unmated male and female adults decreased following high-temperature stress and 24 h of recovery at 25 °C. High temperatures affected males more than females; 37 °C is the critical temperature to control the population ofB. odoriphaga. These results lay the foundation for the future development of environmentally friendly high-temperature prevention and pest-control strategies.Keywords:Allium tuberosum;chive gnats;emergence;fertility;sublethal
研究领域:
昆虫学
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农业害虫防治
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DOI
PubMed
高影响因子
AQUATIC TOXICOLOGY
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2019
·
IF 3.794
Mengdi Xie,Yingxue Sun,Jianfeng Feng,Yongfei Gao,Lin Zhu
Predicting the sublethal effects of pollutants to aquatic organism is essential in realistic chemical risk assessment. However, only a few dynamics models for sublethal endpoints are available. Here, we investigated the toxic effects of the essential metal Cu and the nonessential metal Cd on Chlamydomonas reinhardtii under both single and combined exposure, compared the effectiveness of different effect endpoints as toxic effect factors, and developed a Dynamic Energy Budget toxicology (DEBtox) model to predict the sublethal effects of Cu and Cd on C. reinhardtii . The results showed that the chlorophyll fluorescence parameter is a better toxic effect indicator than others for short-term exposure (<24 h), while algal cell growth is preferred for long-term exposure (2–6 days). The developed DEBtox model could successfully predict single metal toxicity to C. reinhardtii, while the combined metal DEBtox model slightly overestimates the joint toxicity of Cu-Cd due to the antagonistic effect of Cu-Cd on C. reinhardtii. This study is helpful to understanding and better predictions of metal sublethal toxic effects on aquatic organisms.
研究领域:
环境毒理学
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水生生物学
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DOI
PubMed
高影响因子
PEST MANAGEMENT SCIENCE
·
2019
·Vol. 76
·期 3
·888-893
·
IF 3.255
Kipchoge Leviticus,Li Cui,Han Ling,Zhong-Qiang Jia,Qiu-Tang Huang,Zhao-Jun Han,Chun-Qing Zhao,Lu Xu
BACKGROUND Two-spotted spider mite (TSSM), Tetranychus urticae Koch is a serious agricultural pest and has developed high levels of resistance to many acaricides. Hence, screening new acaricides is important in the control of TSSM. Fluralaner, a novel isoxazoline, has high activity against agricultural and ectoparasitic pests; however, little information is available about its effects on agricultural mites. Lethal and sublethal effects of fluralaner towards TSSM eggs and female adults were therefore evaluated in this study. RESULTS Fluralaner exhibited higher activity towards TSSM female adults (LC 50 , 0.49 mg L −1 ) compared with commercial acaricides including fenpyroximate, pyridaben and hexythiazox, and also excellent activity towards eggs (LC 50 , 0.36 mg L −1 ). The results of a sublethal effect study showed a significant reduction in the duration and fecundity of female adults with increases in the tested concentrations. The net reproductive rate ( R 0 ) decreased to 67.34 ± 3.96 and 50.29 ± 3.40 offspring per individual in LC 10 and LC 30 treatments compared with control (108.31 ± 7.61 offspring per individual). The intrinsic rate of increase ( r ) and finite rate of increase ( λ ) in the controls (0.30 and 1.36 d −1 ) were significantly higher than in the LC 30 treatment (0.25 and 1.29 d −1 ); whereas, they were almost identical to values for the LC 10 treatment. No change in mean generation time ( T ) was observed at sublethal concentrations treatments. CONCLUSION Our results demonstrated that fluralaner has high acaricidal activity and could be considered a potential acaricide for TSSM management. © 2019 Society of Chemical Industry
研究领域:
农业科学
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害虫管理
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植物保护
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DOI
PubMed
高影响因子
PEST MANAGEMENT SCIENCE
·
2021
·Vol. 77
·期 6
·2964-2970
·
IF 4.845
Ning Shen,Yao Li,Kipchoge Leviticus,Xiao Li Chang,Tao Tang,Li Cui,Zhao Jun Han,Chun Qing Zhao
BACKGROUND Two-spotted spider mite (TSSM), Tetranychus urticae Koch, is one of the most serious pests of agricultural crops. Broflanilide exhibits high lethality against various pests and has been marketed worldwide under the Vedira and Tenebenal brands in 2020. Nevertheless, little information has been reported about its effects on agricultural mites. RESULTS Broflanilide displayed higher toxicity to TSSM eggs (24 h LC 50 , 1.015 mg L −1 ) and adult females (24 h LC 50 , 2.062 mg L −1 ) than commercial acaricides, including cyflumetofen, bifenazate, and profenofos. In contrast, the adverse effects of broflanilide on the predatory mite, Typhlodromips swirskii Athias-Henriot, was lower than those of fenpyroximate and abamectin. In the sublethal effect study, while adult females were treated with broflanilide, the number of eggs and longevity were reduced in LC 10 and LC 30 treatments; when eggs were treated with broflanilide, the egg duration and deutonymph duration were prolonged in LC 30 treatment. A significant decrease in the total life span and duration and fecundity of adult females was observed in LC 10 and LC 30 treatments. Furthermore, the number of eggs per adult female was significantly reduced from 103.48 ± 3.69 in the control group to 69.42 ± 2.22 and 48.33 ± 1.75 in LC 10 and LC 30 treatments, respectively. In the greenhouse bioassay, broflanilide 5% suspension concentrate (MCI-8007) showed excellent acaricidal activity to TSSM, with 99.22% corrected control, compared with the MCI-8007 untreated group. CONCLUSION Our results indicated that broflanilide has a high acaricidal activity to TSSM and significant inhibition to fecundity of adult female, and could be considered as a potential alternative for TSSM management. © 2021 Society of Chemical Industry.
研究领域:
农业科学
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害虫管理
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植物保护
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Xiangmei Xiang,Juanjuan Zhou,Shaochen Lin,Nan Zhang,Gulizhabaier Abulipizi,Guikui Chen,Zhanjun Li
Microplastics (MPs) can adsorb and influence the toxicity of traditional pollutants significantly. Although the complex toxicity of MPs and molecular pollutants were frequently reported, rare work has been done on the influence of MPs on the phototoxicity of photosensitive pollutants under light illumination condition. Herein, polystyrene microplastics (PS) (~1 μm in diameter, 5.0 mg/L) was used as a model MP to investigate its influence on the phototoxicity of a soluble blue dye, methylene blue (MB) using Daphnia magna as a model organism. The results indicate that PS could adsorb MB effectively and quickly, thus led to concentrated MB on PS/water interface. D. magna ingested MB-adsorbed PS very quickly within tens of minutes. Although MB or PS alone led to negligible lethal phototoxicity to D. magna , PS significantly enhanced the lethal phototoxicity of MB (0.25 mg/L) to D. magna after light illumination (10 h) with the survival rate decreased by 63.3 % compared with the control in the dark. Further, the phototoxicity of MB was found positively consistent with PS concentration from 0.50 mg/L to 7.50 mg/L. The singlet oxygen fluorescence assay indicates that the presence of PS did not increase the total amount of singlet oxygen in the aquatic environment but increased the local concentration in the gut area via non-selective ingestion of D. magna . High level singlet oxygen generated in the gut might possibly be the main reason that led to the massive death of D. magna . Surface adsorption of photosensitive pollutants may transform inert MPs into persistent solid sources of singlet oxygen production and become a new potential lethal threat to aquatic small organisms and ecological equilibrium. This kind of MPs and light dual drive phototoxicity of photosensitive pollutants needs to paid more attention in understanding the uncertain ecological risk of MPs.
研究领域:
环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
FOOD MICROBIOLOGY
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2023
·
IF 5.3
Hongchen Zhang,Yujun Zhai,Kewei Chen,Hui Shi
Escherichia coli O157:H7 can recover from sublethally injured (SI) state, which causes threat of foodborne illness . Adhesion plays a key role in the carriage of pathogens in food . In this study, we investigated the adhesion ability of SI and recovered E. coli O157:H7 wildtype and its three pili-deficient mutants (curli, type 1 fimbriae , and type IV pili) on six food-related surfaces. Plate counting was used to determine adhesion population after washing and oscillating the surfaces. Spinach exhibited the stronger adhesion population of E. coli O157:H7 than the other fresh produces (p < 0.05). In addition, at least one key pili dominated adhesion on these surfaces, and curli was always included. The adhesion population and contribution of different types of pili were jointly affected by surface and physiological state. This can be attributed to high hydrophobicity and positive charge density on surface and different expression levels of csgB , fimA , fimC and ppdD in SI and recovered cells. Among glucose, mannose , maltose , fructose, lactose, and sucrose , addition of 0.5% mannose could reduce adhesion of cells at all physiological states on stainless steel. Overall, this research will provide support for controlling adhesion of SI and recovered E. coli O157:H7.
研究领域:
微生物学
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食品安全
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DOI
PubMed
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
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2014
·Vol. 93
·期 2
·204-208
·
IF 1.216
Hu Xue-lei,Sun Zhi-wei,Wang Jing-jing,An Min,Duan Shun-shan
The aim of this paper was to examine the sublethal toxic effects of nonylphenol ethoxylate (NP 10 EO), its primary degradation product nonylphenol (NP), and their mixture on Moina macrocopa . Chronic toxicity tests were carried out by using sublethal chemical concentrations. Results showed that all treatments reduced the survivorship, body length, and reproduction of M. macrocopa with NP being 10 %–20 % more toxic to M. macrocopa than NP 10 EO. Results also indicated that the toxic effects of NP 10 EO and NP mixture on M. macrocopa were more severe than that of any single chemical alone. At the highest concentration in this experiment, 0.337 mg L −1 NP 10 EO plus 0.0154 mg L −1 NP treatment caused the survivorship of M. macrocopa to zero, neonates number of reproductions to zero, 45.5 % reduction in the body length, and 88 % reduction in the total neonates number.
研究领域:
环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2023
·
IF 6.8
Di Ju,Yu-Xi Liu,Xue Liu,Youssef Dewer,David Mota-Sanchez,Xue-Qing Yang
The codling moth Cydia pomonella (Lepidoptera: Tortricidae) is a major invasive pest of pome fruits and walnuts worldwide. Lambda-cyhalothrin (LCT) and abamectin (AM) have been frequently used in C. pomonella control, but control of this pest is very difficult because shortly after hatching, larvae of this insect bore tunnels and hide inside host plant fruit. In this study, a simulated field spray bioassay method was developed against neonate larvae of C. pomonella and concentration-response bioassays were conducted to evaluate the susceptibility of the neonate larvae to LCT and AM. Exposure of neonate larvae to sublethal concentration (LC 30 ) of LCT or AM significantly reduced the survival rate of larvae (4th and 5th instars), lowered the mean weight of larvae and pupae, and decreased the daily maximal number of eggs laid and the total number of eggs laid (fecundity) per female. The sublethal effects, including reduced body mass, mean fecundity and net reproductive rate, extended mean generation time, and shortened oviposition period, were also found in transgenerational offspring. Furthermore, the transgenerational maternal effects were more obvious for AM than LCT, in comparison to the control. Additionally, the estimated population size was decreased by exposure to LC 30 of LCT and AM, and the observed reduction of fecundity and population size within and across generations was likely the result of the downregulation of the reproduction-related vitellogenin gene ( CpVg ) after exposure to LC 30 of LCT and AM. These results provide a better understanding of the overall effects of LCT and AM on C. pomonella and the transgenerational effects which should be taken into consideration when using insecticides in order to control C. pomonella .
研究领域:
昆虫学
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害虫管理
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生态毒理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ECONOMIC ENTOMOLOGY
·
2016
·Vol. 110
·期 1
·230-238
·
IF 1.609
Xu Chunmei,Ding Jinfeng,Zhao Yunhe,Luo Jian,Mu Wei,Zhang Zhengqun
To better understand the application prospect of cyantraniliprole against the Asian corn borer, Ostrinia furnacalis, a diet-incorporation bioassay was adopted to determine the toxicity of cyantraniliprole against the fourth instar of O. furnacalis. Moreover, other experiments were conducted to examine effects of sublethal levels of cyantraniliprole on larval development, nutrient utilization, and reproduction. In this study, cyantraniliprole showed a high toxicity to fourth-instar larvae of O. furnacalis at dosages of 0.05 μg/g (LC5), 0.11 μg/g (LC20), 0.20 μg/g (LC40), and 0.26 μg/g (LC50) administered through artificial diet. At three sublethal dosages, cyantraniliprole inhibited larval feeding processes, decreased the relative growth rate, the relative consumption rate, the efficiency of food ingestion, and the efficiency of food digestion, as well as decreased the contents of nutrients such as proteins, lipids, and carbohydrates. All these effects go against to the normal growth of O. furnacalis, including reductions in larval and pupal weight, the extension of the larval and pupal period, the prolongation of the adult preoviposition period, total preoviposition period, and mean generation time, and the reduction of adult longevity, oviposition period, and eggs laid by female adults. Together, these changes resulted in the reduction of the intrinsic rate of increase. Hence, even at sublethal concentrations, cyantraniliprole can affect population dynamics by reducing the survival rate, fecundity, and population parameters. This result provides useful information for developing control strategies for O. furnacalis.
研究领域:
昆虫学
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害虫管理
·
农业科学
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产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2024
·
IF 7
Yunshuang Man,Mengjiao Zhang,Hui Tang,Rui Wen,Rongrong Yang,Lin Mei,Jun Qi,Ruitong Dai,Guoyuan Xiong,Lele Shao
Salmonella Typhimurium, a common foodborne pathogen, is widespread in foods. Lactic acid (LA) has been employed to control bacteria in food, while it can induce the formation of sublethally injured bacteria. The sublethal injury of LA against S . Typhimurium on beef was determined in this study, meanwhile the inactivation and sublethal injury kinetics of S . Typhimurium in aqueous solution treated with LA at different temperatures (4, 25, and 37 °C) and concentrations (1, 2, 4, and 6 mM) were also investigated and fitted. The sublethal injury was also validated by flow cytometry (FCM) and high content imaging system (HCS). LA could induce sublethally injured S. Typhimurium on beef and in aqueous solution, the injury ratios in both the cytoplasmic and outer membrane increased with increasing exposure time (0–180 min), concentration (1–6 mM) and temperature (4–37 °C). Modified Logistic and modified Weibull models fitted the inactivation kinetics well, and the parameters indicated that LA caused accumulated damage to S. Typhimurium. The inactivation and sublethal injury effects of LA on S. Typhimurium were verified by FCM and HCS analysis.
研究领域:
食品安全
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微生物学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
·
2018
·
IF 3.44
Xin-Ru Li,Yue Li,Wei Wang,Ning He,Xiao-Ling Tan,Xue-Qing Yang
Lambda-cyhalothrin has long been recommended as an effective insecticide to control the oriental armyworm , Mythimna separata (Walker), a notorious migratory pest of agricultural plants. Previous researches have suggested that survival, development, and reproduction of insects are influenced by sublethal concentrations of insecticides. However, the effects of sublethal concentrations of lambda-cyhalothrin on M. separata are less known. In this study, we determined the toxicity and effects of LC 20 and LC 50 concentration of lambda-cyhalothrin on development and reproduction of M. separata . Results indicate that LC 20 of lambda-cyhalothrin tends to decrease the life traits of M. separate , with a shortening larvae period of offspring and oviposition period, whereas LC 50 of lambda-cyhalothrin stimulates daily maximal fecundity and forwards the oviposition peak, suggesting a stimulation of reproduction by LC 50 of lambda-cyhalothrin. The M. separata population was increased by an LC 50 concentration of lambda-cyhalothrin, resulting in a net reproductive rate ( R 0 ) and intrinsic rate of increase ( r m ) significantly higher than that of the control. Transcripts of vitellogenin ( MsVg ) and vitellogenin receptor ( MsVgR ) genes were suppressed at day 1 after emergence of moth which developed from the larvae exposed to LC 20 and LC 50 of lambda-cyhalothrin, but were significant induced when the moth begin to lay eggs (day 4), with a more remarkable induction by LC 50 of lambda-cyhalothrin than those of LC 20 of lambda-cyhalothrin. Our results indicate that the observed stimulation of reproduction is therefore the results of up-regulation of MsVg and MsVgR by LC 50 of lambda-cyhalothrin.
研究领域:
昆虫学
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毒理学
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分子生物学
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DOI
PubMed
高影响因子
ARCHIVES OF MICROBIOLOGY
·
2024
·Vol. 206
·期 12
·1-13
·
IF 2.3
Zhai Yafei,Wang Yuhao,Wang Bohua,Niu Liyuan,Xiang Qisen,Bai Yanhong
Dielectric barrier discharge (DBD) plasma can be used to control food spoilage and food pathogens. However, DBD plasma may induce sublethal injury in microorganisms, constituting a considerable risk to food safety. This research was designed to investigate the sublethal injury and recovery of Escherichia coli O157:H7 after DBD plasma treatment. The results indicated that the sublethal injury ratios of cells rose along with the augmentation of treatment time and input power of DBD plasma under mild treatment conditions, whereas injury accumulation ultimately culminated in cell death. The highest sublethal ratio of 99.3% was obtained after DBD plasma treatment at 18 W for 40 s. When solutions such as phosphate buffered saline (PBS), peptone water, glucose solution, and tryptic soy broth (TSB) were used for cell recovery, TSB was proven to be the most efficacious, facilitating the completion of recovery within 2 h. The repair ratio of injured cells increased as the recovery pH (3.0–7.0) and temperature (4–37 ºC) increased. Moreover, Mg 2+ and Zn 2+ were demonstrated to be necessary for the recovery process, while Ca 2+ presented a weak effect. Understanding the sublethal injury of bacteria resulting from DBD plasma treatment and their repair conditions can provide useful insight into avoiding the occurrence of sublethal injury as well as inhibiting the occurrence of recovery during food processing and storage.
研究领域:
微生物学
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食品科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）