Studies On Biolgoy Of Massicus Raddei (Coleoptera Cerambycide) And Contro Techiques For Adult Stage

The oak longhorn beetle, Massicus raddei Blessig (Coleoptera: Cerambycidae) is the most severe forest pest and has caused serious damages to oak forests in northeastern China. For control the pest, the studies on biology and occurrence characteristics of the pest and the pollution-free control techniques of adults were carried out both in forest and in lab. The main contains and results for the study are as follows.1. Studies on biology of Massicus raddei. The oak longhorn beetle developed regularly in Kuandian Forest, Liaoning Province. Three years were needed for completing one generation which passed four years. Its adult emergence time was in whole July. After emergence, the adults wounded the trunk bark and sucked the sap exuded for supplementary nutrition. The adult emergence period was about 40 days. It had strong phototaxis, strong flying ability. It had several times to mate and oviposit in all its life and it began to lay eggs after mating 2-3 days. Eggs began to hatch in early August, and it stayed in larva stage since then. It overwintered in larval stage, then it got bigger significantly one year before eclosion. The prepupa stage started in mid-May of the third year, and then it began to turn pupa in early mid-June. The adult emergence period was mainly in July.2. Trapping technology on adults of Massicus raddei by a special black light. The adults of Massicus raddei lived exposed, which was the pivotal period to control. Trapping test about adults of Massicus raddei by a special black light was carried out. The results showed that the ridge was the best slope position for setting the light and the time of 20:00-22:00 in a day of emergence period was the best time for trapping. The black light trapped more adults in sunny days than in cloudy days. The males trapped were a little more than females in the early and later emergence period, and more females in the emergence peak. The eggs contained in trapped females were about 30 in the early peak emergence period, almost the same as the virgin females. These results indicated that the trapped females had not laid her eggs yet. The contrast test indicated that the number of trapped adults by black light was 2.03 times as many as ordinary flashlight, which showed that it was a key technology to control the number of Massicus raddei trapped by the special black light.3. Sterilized impacts on adults of Massicus raddei by three IGR. A study on sterilized impacts of three IGR, i.e., chlorbenzuron, diflubenzuron and triflumuron, were carried out. They were diluted to six different concentrations, i.e., 500, 1000, 1500, 2000, 3000 and 4000 times as six treatments. The results showed that there were no significant differences among the three IGR in female and male adult life-span, number of eggs-laying, the lasting time both of egg-laying and egg hatching. However, the egg numbers laid were much lower than the control group. Meanwhile, the egg-hatching rate indicated significantly different among the different treatments. The concentrations of three IGR with 1500-times dilution all revealed significant inhibitive impacts on egg hatching, and the inhibition correlated positively with concentration. The toxicity equations were significant, and the inhibitive impact on egg hatching by chlorbenzuron of 500 times showed the highest.4. Primary study of attractant on adults of Massicus raddei. Preliminary screening of attractants for trapping Massicus raddei adults with 3 ratios was carried out indoor and outdoor. Results show that MRA is the best. The average trapped number was 11.8 outdoor, which indicated significantly different among other attractants. The time of 19:00-21:00 in a day was the best time for trapping outdoor. There was no withdrawal effect to adults after adding MRP to MRA, but their feeding time was shortened. The accumulative mortality rate reached over 80% after two-hour feeding, which brought about a striking effect.The study explored biology of Massicus raddei, and the pollution-free control techniques of adults were carried out mainly. It contained that trapping technology about adults by a special black light, chlorbenzuron was screened with sterilized impacts on adults by three bionical chemosterilants and attractant on adults which can use in forests with high mountains and deep ditches was screened. All these techniques brought about striking effects, and provided several kinds of control techniques to control adults of Massicus raddei. They were safe and pollution-free to environment, and offered important technology support techniques to control adults of Massicus raddei.