[ Objective ] The study aimed to effectively and timely control the occurrence and damage of Rhyrthophorus femuneus Fabricius in Nanning City, Guangxi Province. [Method]The investigation on the distribution and damage of R. ferrugineus was conducted in Nanning City, Guangxi Province. Its transmit ways were chocked, light trapping experiment, combination of artificial and chemical control, and chemical control were conducted. [ Result] The investigation indicated that there had distribution of R. ferrugineus in 70% plant nurseries and the scenic areas in Nanning City. Among the planted Hemp palm plants, the damaged vari- eties were up to 80%. The output of palm seedlings which had carried with pests was the main approach for spread and damage of R. ferrugineus. It was effective and feasible to use frequently vibration trapping light to trap adults. Pesticides were sprayed on the bellmouth of host （ central leaf）, then aging leaf sheaths or agri- cultural film was used to strap tender leaf sheath in stalks, which could achieve the purpose of controlling R. femugineus. [ Conclusion ] The control strategies of R. femugineus should be focused on controlling seedlings and the plants with tree age less than ten year; the plants with long tree age and the tall plants should adopt selection control if it was necessary, and the integrated control should be implemented on the prevention measure.
[ Objective] Correlation of microstructure of leaf sheath epidermis and nutrient composition of palm plants with the damage degree of red palm fiber elephant in four kinds of plants in Nanning were analyzed in order to control the occurrence and damage of this insect in Nanning. [Method] Taken 4 kinds of Palmae plants in Nanning including Ravenea fivulafis, Washingtonia filifera, Phoenix canafiensis, Roystonea regia （HBK.）O. F. Cook as materials, damage situation of the red palm fiber elephant was investigated, microstructure of leaf sheath epidermis and nutrient composition of palm plants were analyzed and determined. [ Result] The results showed that there was direct correlation between the microstructure of leaf sheath epidermis and nutrient composition with the physical resistance of palm plant against red palm fiber elephant. The extend of damage from red palm fiber elephant had negatively relation with the thickness of corneum and leaf epidermis. The damage degree caused by red palm fiber elephant increased with the content of crude protein, crude ash and nitrogen free extract increasing, also increased with the content of rude fiber decreasing. [Condusion] The damage degree of red palm fiber elephant had a relationship with microstructure of leaf sheath epidermis and nutrient composition of palm plants.
[Objective] The morphology observation and investigation on occurrence and damage condition of Rhynhophorus ferrugineus were conducted.[Method] The samples of R.ferrugineus at different instars were collected from the nurseries in Nanning City,and morphological observation was carried out under the entity microscope,and their characteristics were described.In Nanning City,with Palm plants as the investigation object,the random sampling investigation was conducted in damage peak period of R.ferrugineus,the total number of investigated plants and the number of damaged plants was recorded.[Result] The size,shape and arrangement of droplet-shaped spots in adult pronotum of different individuals of R.ferrugineus are inconsistent,the morphological characteristics of larvae in different host are the same,while the sizes of insect bodies of the same instar are different.The pests mainly distribute in part of nurseries and the concentrated cultivation places of palm trees in Nanning City,which mainly damage the palm plants such as R.rivularis,W.filifera,P.canariensis,B.nobilis and P.x loureirii,etc.within Nanning City.[Conclusion] The study laid the foundation for the research on the occurrence law and the control technique of R.ferrugineus in Nanning City.
