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Xie Meng,Du Jinying,Yang Kunqi,Song Shaoting,Lv Zonghui,Xu Huailiang,Wen An Xiang,Wang Qin,Jiang Yanzhi,Zhu Guangxiang,Wu Jiayun,Yao Yongfang,Ni Qingyong 한국곤충학회 2021 Entomological Research Vol.51 No.2
Leaf-rolling weevils (Coleoptera: Atelabidae) are considered to be specialists that oviposit only on one or two plant species. However, Apoderus dimidiatus can oviposit on at least five species. We aimed to determine whether A. dimidiatus females have different preferences for oviposition substrates, and whether differences in physical factors, nutrition and parasitism affected their choices. We observed the number of cradles, hatched larvae, pupae, emerging adults and parasitism rate during one breeding season. Weevils were given access to two host plant species, Rosa multiflora and Rubus ichangensis, and the leaf size and nutrient contents of the two plant species were investigated. We found that nutritional content, especially soluble carbohydrate, correlated with oviposition preference of weevils, and the more nutritious plant species, R. multiflora, was the preferred host in our experiment. Weevils can also use Ru. ichangensis and other plant species as hosts, likely to relieve the high parasitic pressure when laying eggs on a single host species.
Zhang Xu,Wan Jinchu,Zhu liang,Zhou Hui,Yang Zonghui 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12
A multiple gas tungsten arc welding was performed on the fabrication of the Fe–Cr–Ni-based weld metal. Microstructuresand hot corrosion behaviors of the non-equilibrium weld metals with different Nb contents in 75 wt%Na2SO4–25 wt%NaClmolten salt at 700 °C have been investigated. A bilayer oxide film composed of an inner Cr2O3layer and an outer Fe2O3layer formed on the surface of the weld metals. The mass gain rate and the thickness of the surface oxide film were enlargedwith Nb addition, which could be attributed to the rapid inward diffusion of O through the cracks resulting from the Nboxide. Oxidation and sulfidation occur in the matrix, resulting in a large internal oxidation zone (IOZ) in the weld metal. Nb seemly promoted the sulfidation reaction due to a short-circuit diffusion of S through the interface of the Nb(C, N)and matrix and made the internal corrosion products to be distributed along the interdendritic zone of the weld metal. Anapparent Cr-dealloyed layer appears in the IOZ of the weld metal. Dealloying was the detrimental form of hot corrosion ofFe–Cr–Ni-based weld metal exposed to molten salts containing chloride salts. Alloying with 0.8 wt% of Nb further acceleratedthe dealloying and resulted in a profound attack.