Study On The Integrated Control Of Hylobitelus Xiaoi Zhang

Hylobitelus xiaoi Zhang belongling to the Coleoptera, Curculionidae, Hylobiinae, Hylobitelus, is a new insect species that bores seriously in the base trunk bark of the pines. The larva invasion base bough or the root crown bast organization, shuts off the organic nutrient transportation, affects the arboreal growth, serious entire death. Through the nearly more than two years time open country investigations, builds a shed in the raising observation and the room raises, further grasp this insect in the northwest area of Fujian Province biology characteristic and so on life history and life habit.The pest has one generation biennially and over winters as larvae and adults in Fujian Province. The overwintering adults appear in middle late March and lay eggs in late April. The larvae hatched in middle May and start overwintering in early December, become active in the following middle March and pupate in middle August. The adults emerge a in their pupal cells in mid-September. For the first time discover adults insect in the forest have gathers habit during peak copulation period gather place often to be located under the dry fallen leaf, very difficult to discover.The overecooling point determination of the wintering larva indicate the highest point is -4.39 ℃, lowest-16.50℃, the mean value -9.71 ℃, so the pest can endure a lower temperature, and its north geographic distribution is in north latitude 30 Neighbor.Eight methods were used to determine the larval spatial pattern of Hylobitelus xiaoi Zhang in Pinus elliottii. The results showed that the spatial pattern fitted the nenative binomial series and the larvae had a clumped spatial distribution. The formula for determining the optimum theoretical sampling number is N=(1.0528/M-0.1326)/D~2. The development of hylobitejus xiaoi in the forest of Pinus massoniana was studied in relation to nine environment factors including stand age, species composition, tree height, stand density, slope position, slope gradient, slope aspect, elevation.The results showed that the infection rate had a strong relationship with the stand age, species composition and the slope gradient.It's discovered that it can lure adult Hylobitelus xiaoi by setting up freshly stump among the trees during the Mid-April, which may become a new control mean; the tests indicate that whole result through watering pesticides around the roots superior to that through injecting pesticides into the trunks and the control results of adopting different pesticides under the same density has prominent differences in the condition of watering pesticides around the roots, oxidizing Rigors have the best control result; clearing up Forest land can play certain control function to prevent Hylobitelus xiaoi Zhangs take place and it has better result in mid-March instead of in mid-Apri];the indoor infects determination indicate metarrhizium anisopliae display the stronger pathogenesis strength to the adult insect, the 14th day lgLC50 value was 5.13, demonstrating this fungus has the potential control valute to this insect population with further studying. The test result used the time - dosage - mortality rate model to carry on the analysis, accurately has manifested the time and the dosage effect complete unity, thus caused the time and the dosage effect...