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[Objective] This paper aimed to explore occurrence status and species of root knot nematodes in kiwifnjit orchards and lay a foundation for control of Meloidogyne incognita in Xiuwen county, Guizhou. [Method]The morphology, rDNA-ITS and specific sequence of root knot nematodes collected from main producing region of kiwifnjit in Xiuwen county were analyzed and identified. [Result] The perineal pattern of female root knot nematode adult had a high and square-shaped dorsal arch composed of wavy smooth lines from thin to thick and some lines were bifurcated on the side without an obvious lateral line. The similarity between sequence of specific amplified fragment and sequence of Meloidogyne incognita in NCBI Database (Accession number ;JN005841. 1. 1) reached 100 %,which indicated that the root knot nematode belonged to Meloidogyne incognita. [Conclusion] The root knot nematode endangering kiwifruit is Meloidogyne incognita mainly in Xiuwen county, Guizhou. [ABSTRACT FROM AUTHOR]

Inflorescence stem mechanical strength and some elements contents of herbaceous peony (Paeon,ia lactiflora Pall. ) within three categories were measured. The results showed that the contents of Ca, K, Mg, Cu, Zn and Si were characterized by high mechanical strength variety > medium mechanical strength variety > low mechanical strength variety, the content of Fe and Mn in contrast. Among them, Ca K, Mg and Si content were significant differences between the type, and the others were not significant difference between the types. Correlation analysis showed that stem mechanical strength of the high mechanical strength class significantly positively correlated to Ca, K and Sicontents, and the medium together with low one significantly positively correlated to Ca and Si contents. Mechanical strength positively correlated to Cu contents, and significantly associated with medium mechanical strength varieties. The correlation was different in stem mechanical strength and Mg, Fe, Mn, Zn contents. [ABSTRACT FROM AUTHOR]