| In order to study on the bionomics of red turpentine beetle (RTB) and the application technology of its Kairomone in the monitoring and control of RTB , field investigations and experiments had been done in Qinyuan city and Jincheng region. RTB has two generations a year in Jincheng region, overwintering as adult, pupa, or larva in stem base and its galleries in root cortex. Adults started to move in mid-March, and appeared on host in mid-Apr. Mid-May is the flying peak of overwintered adults and Mid-Aug.for 1st generation. Late Octomber is the emergence period of 2nd generation. The development of this insect is not uniform, with generation overlapping. In Qinyuan city it only has one generation (60%~70%) a year, two generations in three years or one generation in two years (30%~40%).In the field experiments, (S)-(+)-3-carene listed the first in the attraction to RTB. (R)-(+)-a-pinenc and (S)-(-)-β- pinene had no significant attraction. After added one seventh of (+)-limonene, and chlorophyll separately in (S)-(+)-3-carene, the attractions were reduced apparently. The Ecotrap traps catched the most RTB, followed by the multiple funnel traps and the slot traps, whereas there were no significant differences among them. Sticky traps were the worst. Ecotrap trap is recommended to be used widely for its easy setting and low cost. According to monitoring of the attractent, in Qinyuan city the flight peak appears at the middle May in a year, some times there is a lower flight peak in August There were signicant correlation between trap catches and new pith tube. The best modle was cubic polynomial regression: y=3.624x~3+0.109x~2-0.001x+136.631(R=0.567, p=0.001). Mass trapping experiment shown that current year's damage of RTB to Pinus tabulaeformis was reduced by 8.91%. Push and pull experiment experiments indicated that punches set at 20m apart could increase the attraction of attractent to RTB. The Current year damages were significantly reduced after all four treatments.
|
PDF Full Text Request