Correlation between Inclusion Contents in Casuarina spp. Twigs and Its Resistance to Lymantria xylina.

[Objective] The paper was to explore the correlation between inclusion contents in Casuarina spp. twigs and its resistance to Lymantria xylina. [Method] Three types of representative Casuarina spp. strains including resistant strains(Zhanjiang 3, Hui 76, Hui 83, Guangdong A8-2), moderate resistant strains(Pingtan 2, Hui 1, Long 7-18) and susceptible strains(Dongshan 2, Guangdong 501, Kangfeng) were used as materials to determine the contents of six kinds of inclusions, total phenol, tannin, flavonoids, protein, soluble sugar and polysaccharide. [Result] The resistant strains had higher flavonoids, tannin and total phenol contents and lower soluble sugar and protein contents than the susceptible strains, while the content of polysaccharide acted randomly. The grey correlativity analysis showed that resistance degree, pupation rate and pupal weight had high correlation with protein and soluble sugar contents, with correlation index equal to or above 0.5000. [Conclusion] The study provided a theoretical basis for screening and promotion of resistant strains against L. xylina. [ABSTRACT FROM AUTHOR]