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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2010年47 No.5

Preliminary observation on damage habit of rice stem borer(Sesamia inferens)at rice heading stage
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Key Words:rice heading stage, Sesamia inferens, wormhole position, distribution of insect
Abstract: In order to observe crop damage caused by Sesamia inferens Walker, samples of conventional rice crops were collected at different stages of growth (early dough, middle dough, yellow ripeness and wilting stages) in 2009. The number of wormholes in single plants was usually in the range of 2~3 but could be as high as 5. Plant damage could be ranked in increasing order as follows:  white head, withered ear and insect damaged. With the ripening of rice panicles and increasing insect instar, the location of wormholes changed from the upper-middle to the lower-middle of rice plants. More than 70% of wormholes in white headed and withered plants were distributed over the first to third and third to fifth internode from the top to down. In the four growth periods, about 90% wormholes were distributed over the first to third internode, first to fourth internode, second to fifth and third to fifth internode. More than 85% of worm numbers in whole plants were distributed in the first to third internode, second to fourth internode,third to fifth and third to fifth internode. The number of insects found in individual plants was 18, 6, 3 and 2 and within the same internode was 12, 5, 1 and 1. When there was more than one insect in a single internode, > 80% of these were first to third instar larvae. With the ripening of rice panicles, insect numbers in white headed and withered ear plants reduced gradually, but those in insect damaged plants either remained relatively stable or increased. After the wilting stage, both the infection rate and wormhole rate in insect damaged plants was consistently > 30%.
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