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Mass production and application of natural enemy insects in China
Yuyan Li,Zhongjian Shen,Jianjun Mao,Mengqing Wang,Lisheng Zhang 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
Natural enemy insects, including predators and parasitoids, are beneficial organisms that feed upon other agricultural pests. Using natural enemy insects to suppress or prevent outbreak of pests is a key component of integrated pest management strategy. It is safe, effective, and environmentally friendly and can be applied easily to the greenhouses, filed crops and orchards. Rearing and application of natural enemy insects in biocontrol in China have a long history. As early as 1700 years ago, the predator Oecophylla smaragdina has been used for controlling many kinds of citrus pests. Up to now, more than 30 species of natural enemies that can be artificially mass produced and widely used for biological control of many kinds of pests, including caterpillars, aphids, whiteflies, thrips, leaf mites and scales in China. The annual average application area of natural enemies is over 11.34 million hectares. However, with the increasing demand of using natural enemies in biological control programs, the development of natural enemy insect industrialization still face many challenges. It is urgent to explore more effective candidate natural enemies, improve the production efficiency, increase the shelf life of products and enhance the colonization of natural enemy insects after release, and thus facilitate the commercially production and application of natural enemies. This is of great significance for comprehensively promoting the use of green prevention and control techniques for crop diseases and pests, reducing the use of chemical pesticides, ensuing the quality and safety of food and agricultural products, and ultimately promoting sustainable agricultural development.
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Xin Zhang,Minghao Fan,Yongkai Yuan,Jianjun Dong,Hua Yin,Yang He,Lei Mao,Dongfeng Wang,Junhong Yu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Fucoxanthin (FX) is a carotenoid with antioxidant, anti-obesity, anti-diabetic, anti-cancer and antibacterialactivities. It is poorly water soluble and highly sensitive to light, heat and the surrounding environment. Therefore, how to effectively encapsulate it and stabilize it for entry into the human body hasbecome a key research question at present. This study developed a single-carrier to encapsulate FX andshowed excellent characterization results. The experimental results showed that the diameters of FX-ZHparticles prepared by the four encapsulation processes ranged from 143.83 to 216.93 nm. Comparison ofantioxidant activity and stability to temperature and pH of the four complexes showed significant differences,with the best performance of the nanoparticles prepared using water-soluble method and a slowspeedstirrer. The nanocomplexes were proved to be more stable and more bioavailable, with a significant34.41% increase in FX content relative to free FX in the intestinal phase. Inhibition of human leukaemiacells HL-60 cells remained high, with 11.14% ± 6.03% inhibition at FX concentrations of 1 lg/mL. Thisstudy encapsulated FX based on colloidal nanoparticle systems for the first time using a single-carriermaterial, an innovation and breakthrough that could simplify the experimental steps and provide thenecessary basis for industrial realization.
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Muhammad Rashad,Fusheng Pan,Aitao Tang,Muhammad Asif,Shahid Hussain,Jun Gou,Jianjun Mao 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
The Mg–Al–graphene nanoplatelets (GNPs) nano-composites were synthesized using the powder metallurgy method. The effect of Al–GNPs hybrids addition in to pure Mg was examined through tensile and Vicker hardness tests. The GNPs content was kept constant (0.18 wt.%) and Al content was varied from 0.5 wt.% to 1.5 wt.%. The increase in Al content led to increase in 0.2%YS, UTS and failure strain (%). However for Al content exceeding over 1 wt.%, the failure strain(%) started to decrease. The best improvement was achieved with 1 wt.% Al (Mg–1.0Al–0.18GNPs). Mechanical strength of synthesized composites proved to be better than Mg–Al–CNTs and Mg–ceramic composites.
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Contact toxicity of a new acaricide, SYP-9625, to the natural predator, Chrysopa pallens
Feng Yanjiao,Zhang Lisheng,Chen Hongyin,Wang Mengqing,Liu Chenxi,Li Yuyan,Song Yuquan,Mao Jianjun 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.2
SYP-9625 is a novel acaricide synthesized by using cyenopyrafen as lead compound. It is characterized by high acaricidal activity and low toxicity to mammals and has been widely used in Chinese farming areas. However, to date, the toxicity of SYP-9625 to natural enemy insects remained unclear. Here, we evaluated the effects of SYP-9625 on survival, growth, metamorphosis and reproduction of a common natural predator, Chrysopa pallens. Contact toxicity bioassay revealed that SYP-9625 had no significant detrimental impacts on egg hatchability, larval survival and duration, pupation rate, pupal mass, emergence rate, digestive enzyme activity, reproductive output and offspring quality, but drastically reduced adult survival rate, adult lifespan, secondary follicle size and vitellogenin (Vg) transcripts by 27.8%, 15.4%, 33.4% and 59.4%, respectively, suggesting a low contact toxicity of SYP-9625 to C. pallens. This study will strengthen the compatibility of chemical acaricide and natural enemy insects in integrated pest management.
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