| The corn sap beetle, Carpophilus dimidiatus (F.), is a cosmopolitan pest of agricultural produce, including a wide variety of ripe, vegetables, fermenting, fresh or dried fruit, and stored plant products. But there is little information available on so many aspects of this pest. So we went through with experiment in lab, by which studied the rearing method, bionomics, and population ecology, etc.The development, survive, and propagation of C. dimidiatus were approached under different food, photoperiod, and temperature, and the parameters or models of developmental rate, livability, fecundity, were first studied systematically. In parameters analysis, we first applied the life-table technique, fitted the regression equations between the life parameters and temperatures, and set up the theoretical mode. Furthermore, also first definited the mechanism of interspecies competition between C. dimidiatus and C. hemipterus. The results will present references to build up the model for population system administration. The main achievements or conclusions and results are as follows:1 Difficult to rearing, because the imagoes are good at flying, and the larvae are small, pallid in color, and what is more, bore in fetching as often as not, and pupate in the gaps. The research utilized self-made rearing case to work out the problem, by which make the observation of the larvae easy, and also reduced the escape of the imagoes and the larvae. More studies on the beetle bionomics, including the morphological feature, life habit, and the reproductivity.2 Delicately researched on the experimental population ecology of the corn sap beetle, including food, photoperiod, and temperature, and selected the best stock food, photoperiod, and temperature.2. 1 The experiment chose 5 types of food for the feedstuff, in which the food coenobium , brew+pulp, was the best to the beetle development, survive, and reproduction. In addition, the influence of livability was mainly on larval stage and prepupa stage after eating different kinds of food.2. 2 In conditions of short photoperiod, both development period and oviposition period prolonged with the decrease of photoperiod. On the other hand, in conditions of long photoperiod, the former reduced with thelarval stage and prepupa stage after eating different kinds of food.2.2 In conditions of short photoperiod, both development period and oviposition period prolonged with the decrease of photoperiod. On the other hand, in conditions of long photoperiod, the former reduced with the prolongation of photoperiod, but the latter was increased. When L:D was 10:14, the livability and the amount of spawned egg(by one pair) reached the highest, and around this center, both them decreased accordingly while increased or debased the photoperiod. Therefore, we selected 10:14 to be the best photoperiod for rearing.2. 3 Carried on the studies of the effect of temperatures to the beetle development, survive, and reproduction. Not only first determined the temperature of development beginning point and valid cumulative temperature applied the life table technique to set up Time-specific life table and Age-specific life table, but also found out thermal death temperature and duration time. At the same time, we fitted the regression relations or models.2. 3. 1 Calculated the start temperature and valid cumulative temperature by three methods, such as linear regression method, weighted method, and straight-way optimum method. After tested by V-value, the results were no significant difference.2.3.2 Took quadratic parabola to fit the regression relations between the developmental period or rate and temperatures, and the opening of the former parabola was up, the latter was downward. During 20~32. 5癈, all stages liabilities reached the peak at 25*C, and lowest at 32. 5癈. The opening of liabilities parabola was also downward.2. 3. 3 Generally, the adults died gradually after finishing the oviposit. So the variation tendency of the adults life effected by temperatures was in accorda...
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