Study On Population Dynamics And IPM Of Three Bamboo Shoot Boring Noctuids

China is famous for its abundant resources of bamboo in the world. With the economic efficiency of bamboo increasing in recent years, the cultivation area of economical bamboos such as Phyllostachys propinqua, P. praecox, and P. iridenscens have been increasing at 15% per year.The bamboo industry have developed into one of the most beneficial forestry industries. Because of escessive pursues towards economic efficiency, bamboo shoots plant disease is becoming increasingly rampant. In the numerous harmful insects, shoot-boring noctuids were most abundant, which leads to most serious damage. In Zhejiang and Guangdong province, P. propinqua, P. iridenscens and Pseudosasa amablis, caused the loss at the rate of 60%, even reaches 100%. There were several species of shoot-boring noctuids in China. The structure was complex, the host range was broad, the harm hiding, the prevention and treatment was difficult. And there was absence of an effective control technology for reference in the current time. Because of the unclear group of shoot-boring noctuids and unclear invasion rule, it is difficult to control the shoot-boring noctuids. So far, studies on shoot-boring noctuids are mainly on biology and chemical control.Therefore, it is economical and academic significance to study shoot-boring noctuids'kind of group structure, niche, the spatial distribution and the sex pheromone. In this article,three kinds of shoot-boring noctuids Kumasia kumaso Sugi, Apamea. apameoides Draudt and Oligia vulgaris Buter were the main object of study. Using laboratory test and a field survey of using sex pheromone of A. Apameoides, tested niche and spatial distribution and carried out comprehensive management of the three shoot-boring noctuids. The result as follows:(1)The distilling and identification of the sex pheromone components from A. apameoides, EAG measurement showed that crude extract of female moth A. apameoides elicited remarkable responses to male moth, which meant that there were active components in the crude extract. Through compare with the blank comparison's of GC, We discovered that the crude extract of female moth containing the main difference between a peak in the retention time in 14-16min. Using GC-MS, one component Z11-16:Ac was chemically identified. Further electroantennogram response measurement with Z11-16:Ac showed it elicited remarkable responses to male A. apameoides .(2)We found that Apamea kumaso and Apamea apameoides were the main species. The former reached the peak in late-April, experiencing seven days or so, the larva has the quantity to account for annual 85.26%; and the latter aggregated on mid-May, through ten days about, the larva has the quantity to account for annual 68.03%. Oligia vulgaris were captured fewer in the field and observed to be less infested than the previous mentioned two species. Analyses from ecological indices showed that temporal nich breadth of A. kumaso was the narrowest among three noctuids, the temporal niche breath values of A. kumaso and A. apameoides was very similar. Nutritive niche breadth of A. kumaso and A. apameoides were width than O. vulgaris.(3)The methods of comparative frequency distribution was employed to measure the spatial distribution patterns of larva of Kumasia kumaso Sugi. The results showed that the larva didn't obey Poisson distribution in both Phyllostachys propinqua and P. iridescinsn. It obeyed Neyman distribution, Mosaic distribution and Polya-Eggenberger distribution in P. propinqua. In P. iridescinsn it obeyed Neyman distribution and Mosaic distribution. The spatial distribution patterns of the larva were measured by the index of aggregation. Factor analysis showed that K. kumaso in the bamboo shoots between the aggregations were caused by environmental factors, may be related to the aggregated distribution of the shoots.(4)We chose fields of different cultivation, and surveyed the population of shoot boring noctuids. We found there was no significant correlation between cultivations and population of shoot boring noctuids in Phyllostachys propinqua, and there was significant difference between damage rate and population of the pests in Ph. Glauca. The control effect of using luseweilei to shoot boring noctuids is very good.