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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2014年51 No.3

Trends in occurrence of the Asian corn borer, Ostrinia furnacalis (Guenée), over two generations in JilinProvince
Author of the article:ZHOU Shu-Xiang** LU Xin*** LI Li-Juan ZHANG Guo-Hong DING Yan CHANG Xue
Author's Workplace:Institute of Plant Protection, Jilin Academy of Agricultural Sciences, Gongzhuling 136100, China
Key Words:Ostrinia furnacalis, occurrence trend, two generation region
Abstract:     [Objectives]  To investigate the occurrence of the Asian corn borer (ACB), Ostrinia furnacalis (Guenée), over two generation regions inJilinProvincein order to provide a theoretical basis for early control of this pest. [Methods]  The number of egg masses deposited in corn fields were counted every three days from June to October 2002-2013 to determine the occurrence dynamics of ACB.  Larvae of ACB, stalk cavities per hundred plants and the proportion of corn plants damaged by ACB were monitored in autumn to determine trends in corn damage. The relationship between the number of egg masses and the proportion of damaged plants was also analyzed. [Results]  Egg masses of the 1st generation first appeared in the middle of June, peaked in abundance on 25 June and had disappeared by the middle of July. Egg masses of the 2nd generation appeared about 25 July, peaked in abundance in the middle of August and had disappeared by early September. The size of egg masses of the first generation displayed a downward trend whereas that of the second generation increased with weak correlation between the two generations (r= 0.058, P= 0.857) since 2002. Stalk cavities per hundred plants showed a decreasing trend, the number of larvae per hundred plants and the proportion of damaged plants fluctuated irregularly; the general trend was no obvious change among the 12 years. Correlation and path analysis of the relationship between ACB egg masses and the proportion of corn plants damaged, indicates that damage to corn plants is the result of both generations of ACB. The number of egg masses of the first generation had very little effect on the number of larvae overwintering at harvest time, which was mainly determined by the number of second generation ACB egg masses, however, first generation egg masses contributed more to the number of stalk cavities and proportion of damaged plants than those of the second generation. [Conclusion]  Damage caused by the second generation of ACB shows an increasing trend.
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