The Resistance Research Of Different Eucalyptus Species To Leptocybe Invasa Fisher&La Salle

Leptocybe invasa Fisher&La Salle, the English common name is blue gum chalcid, the case of the Hymenoptera Hymenoptera, Eulophidae Eulophidae, a new species that discovered hazard eucalyptus in recent years (Mendel, et al.,2004). At present, there are several organizations have researched Leptocybe invasa Fisher&La Salle, including biology, ecology, occurrence and damage, drug prevention and treatment. Prevention of Leptocybe invasa Fisher&La Salle, chemical control has not been highly effective chemical control reports; in biological control, there are reports of natural enemies, is a dominant species of parasitic Hymenoptera Hymenoptera (Hymenop tera) Chalcidoidea (Chalcidoidea) Eulophidae Section (Eul ophidae) long-tailed rodents wasp genus (Aprostocetus), its origin and name to be identified (Wu Yaojun, Jiang XueJian Li Dewei, such as.2009; Li Dewei,2010) not yet mature enough to be studied, and the introduction of natural enemies need to be cautious, the introduction of predators, need to consider whether the environment have adverse effects for this class of Leptocybe invasa Fisher&La Salle parasitoid pests, natural enemies in a large number of breeding. Therefore, the evaluation and selection of fine eucalyptus resistant varieties, is a more scientific, reasonable, fast control methods. In production is also relatively easy for the majority of eucalyptus growers accept. Measured from the survey of field population dynamics, indoor amount of adult emergence, the field and pick bee survey, eucalyptus histological observation and eucalyptus nutrient analysis of several aspects of a more systematic study of the end of Eucalyptus camaldulensis DH201lobular eucalyptus, GL9, Ray,17, JG1and resistance strength of the JG21six different eucalyptus species of Leptocybe invasa Fisher&La Salle, as well as impact resistance strength of the main factors, now the main results are summarized as follows:1.Eucalyptus insect resistance strength of a field population dynamics investigation of Leptocybe invasa Fisher&La Salle outIn the field observations, DH201tail red eucalyptus and lobular eucalyptus, Leptocybe invasa Fisher&La Salle harm is very serious, GL9and Ray17less harmful, but JG1and JG21is no sense of insects, and wild yellow board survey show serious susceptible Last camaldulensis DH201and lobular eucalyptus, GL9less susceptible, reached a significant difference between the two. The JG1and JG21no sense of insects. In order to determine the initial strength of these types of eucalyptus varieties of eucalyptus branches gall wasp insect as follows:JG1=JG21> GL9=Ray17> lobule eucalyptus=tail camaldulensis DH201.2. Leptocybe invasa Fisher&La Salle indoor amount of adult emergence survey to determine the strength of the eucalyptus insectDifferent Eucalyptus species collected from the wild back infected branches, indoor under the same conditions, the eclosion the amount of the existence of significant differences.Last camaldulensis DH201and lobular eucalyptus infected branches on the amount of adult emergence is much more than the GL9, especially in the year of the second and third quarters, very different. Further determine the strength of several eucalyptus varieties of Leptocybe invasa Fisher&La Salle insect. Three field then bee survey to determine the varieties of eucalyptus insect resistance strength3.Eucalyptus branches on each plant of the statistics of different eucalyptus species wasp gall number of gall Ji, calculation of the worm strain rate, strain the average number of galls and single sample maximum gall number. It can be seen that the six species tested, the end of Eucalyptus camaldulensis DH201and lobular eucalyptus insect strain rate reached100%, showing highly susceptible, followed by GL9and Ray,17, worm strain rate also reached60%; From the strains of the average number of galls, DH201tail red eucalyptus, and lobular eucalyptus, respectively,8.20±116/plant and8.33±0.33/plant, GL9and Ray17is relatively small, only1.13±1.00/plant and1.0±0.83/plant, while JG1and JG21, while almost no sense of insects. The plant's maximum number of galls also showed that for the trial of six Eucalyptus species, the most susceptible of the end of Eucalyptus camaldulensis DH201and lobular eucalyptus, GL9and Ray,17with mild flu insects, JG1, and JG21is a strong resistance varieties. Has once again proven the six kinds of Leptocybe invasa Fisher&La Salle resistance strength of the relationship between:JG1=JG21> GL9=Ray,17lobule eucalyptus=tail camaldulensis DH201.4.Eucalyptus organizational structure on the impact of insect resistanceInsect resistance is weak tail camaldulensis DH201and lobular eucalyptus, the outer skin is thicker, loosely arranged cells, the strong resistance GL9and Ray17and the outer surface is generally arranged between cells more closely, and not susceptible JG1and JG21outer epidermis thin cells arranged more closely.The roughness of the epidermis Bohou extent of Leptocybe invasa Fisher&La Salle parasitic skin more rough, more solid, the more susceptible to parasitic eucalyptus branches gall wasp.5.Eucalyptus branches nutrient content on the impact of insect resistanceVarious eucalyptus varieties of crude fiber content of between20%-40%, crude fiber content of the tail the camaldulensis DH-201and lobular eucalyptus significantly lower than the other four varieties, cellulose content and insect resistance into negative.The JG1and JG21crude protein content and nitrogen content was significantly higher than other eucalyptus varieties, both the most resistant, the crude protein content of insect resistance into a positive correlation.Tail the camaldulensis DH-201and lobular eucalyptus soluble sugar content was significantly higher than the four other Eucalyptus species, the weakest of the two insect resistance, so the content of soluble sugar and insect resistance were negatively correlated.