JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2024
·
IF 1.3
Liang Limei,Wu Minghui,Huang Pengmian,Liu Jiyong
This work is based on the precursor compound cyproflanilide and designs a series of methoxy containing meta-diamine compounds. By replacing the fluorine atom on the phenyl ring in cyproflanilide with methoxy group, 17 derivatives (12a-12q) were obtained with yields ranging from 46 to 92%, which were characterized by high-resolution mass spectrometry, and nuclear magnetic resonance (1H and 13C) spectroscopy and infrared. The insecticidal activities were evaluated against the Plutella xylostella and Spodoptera frugiperda. Compound N-(3-((2-bromopropane-4-(perfluoropropan-2-yl))-6-(trifluoromethyl)phenyl)methoxyphenyl)-N-(cyclopropylmethyl)-6-fluoronicotinamide (12q) showed significant insecticidal activity against the Plutella xylostella with a mortality rate of 97.67% at a concentration of 1 mg L-1. It also exhibited moderate activity against the Spodoptera frugiperda at a concentration of 0.1 mg L-1, which can be used as a template for structure modification to obtain higher insecticidal activity.
研究领域:
农药化学
·
有机合成
·
农业昆虫学
✓ 已验证
DOI
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
·
害虫管理
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF AGRONOMY
·
2024
·
IF 4.5
Huimin Liao,Zifang Zhou,Yangbeijia Liu,Yuyan Luo,Chenning Zhang,Yuanjiao Feng,Yinghua Shu,Jianwu Wang
It is well-known that increasing crop biodiversity plays an essential role in achieving ecologically based pest management (EBPM); however, the mechanism is poorly understood. The Three Sisters (Maize/Bean/Squash polyculture [MBS]) is a traditional mixed cropping strategy that has been practiced for thousands of years in Mesoamerica; however, mechanistic evidence for its resistance to herbivores is still lacking. In the present study, using both greenhouse and field experiments, we investigated the effects of MBS on the direct and indirect defences of maize ( Zea mays ) against Asian corn borer ( Ostrinia furnacalis ) and fall armyworm ( Spodoptera frugiperda ) caterpillars. MBS significantly improved the direct chemical defences of maize, especially against O. furnacalis , by increasing the content of primary metabolites, secondary metabolites (Benzoxazinoids), and phytohormones ((±)-Jasmonic acid-isoleucine, Jasmonic acid) in maize leaves, thus significantly reducing their survival and relative growth rates. MBS significantly improved the indirect chemical defences of maize by varying the species and content of volatile organic compounds (such as a mixture of nonanal, 1-dodecanol and 2-butyl-1-octanol), seemingly resulting in the avoidance of MBS plants by both herbivores in the Y-tube olfactometer tests. Field experiments further demonstrated that MBS significantly reduced damage to maize leaves by herbivores, enhanced maize yields, and increased the abundance of natural enemies. Therefore, we concluded that MBS improves the resistance of maize to major pests, and can be used as an effective and eco-friendly crop protection strategy in agroecosystems.
研究领域:
农业生态学
·
植物保护学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Huitang Qi,Tian Liu,Qiong Lu,Qing Yang
Cycloxaprid (CYC) is effective in the control of hemipteran pests, but its bioactivity against lepidopteran pests is still unclear. Here, the bioactivity of CYC against lepidopteran pests was found to be much worse than that against hemipteran insects. To reveal the mechanism, the transcriptomes of CYC-treated and untreated Ostrinia furnacalis larvae were compared. Among the top 20 differentially expressed genes, 11 encode proteins involved in cuticle formation, while only one encodes a detoxifying enzyme. Thus, the cuticle appears to be important for the insensitivity of O. furnacalis to CYC. A pretreatment of O. furnacalis larvae with methoprene enhanced the bioactivity of CYC by 1.12-fold. Moreover, mixtures of CYC with graphene oxide increased the bioactivity of CYC by 1.88-fold. Because lepidopteran and hemipteran insects often harm crops at the same time, the work can help make full use of CYC and reduce the environmental impacts of using multiple pesticides.
研究领域:
昆虫学
·
农药科学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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