| 蕾铃期棉蚜种群动态及年龄结构变化和受寄生的关系 |
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| 引用本文： | 罗志义,干国培.蕾铃期棉蚜种群动态及年龄结构变化和受寄生的关系[J].昆虫学报,1986,0(1):56-61. |
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| 作者姓名： | 罗志义 干国培 |
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| 作者单位： | 中国科学院上海昆虫研究所 |
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| 摘 要： | 本文描述了1983年棉花蕾铃期棉蚜发生情况。从7月上旬到9月上旬发生量超过往年同期的10倍。绘出了蚜虫数量的对数值和生理时间关系图,描述了棉蚜种群下降过程中年龄结构变化及其与寄生率变化的关系。在棉蚜种群下降过程中Ⅰ龄若蚜占百分比下降表明成蚜生殖力下降。高密度组Ⅱ龄若蚜百分比下降,表明Ⅰ龄若蚜死亡率增大。高密度组成虫比例下降是因为有翅若蚜比例高。上述年龄结构变化和寄生率关系密切,表明蚜群下降到低水平时寄生率上升不完全由于寄生蜂增殖,而Ⅰ、Ⅱ龄若蚜比例下降、有翅若蚜增加和高龄若蚜比例上升中是重要原因。棉株不同位置棉蚜寄生率没有差异。寄生率和单位面积内的蚜虫密度有关。
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| 关 键 词： | 棉蚜 种群动态 年龄结构 寄生率 |
POPULATION DYNAMICS OF COTTON APHIDS ON COTTON DURING SQUARE-BOLL STAGE AND THE RELATION BETWEEN POPULATION AGE STRUCTURE AND PARASITIZATION |
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| LUO ZHI-YI GAN GUO-PEI.POPULATION DYNAMICS OF COTTON APHIDS ON COTTON DURING SQUARE-BOLL STAGE AND THE RELATION BETWEEN POPULATION AGE STRUCTURE AND PARASITIZATION[J].Acta Entomologica Sinica,1986,0(1):56-61. |
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| Authors: | LUO ZHI-YI GAN GUO-PEI |
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| Affiliation: | Shanghai Institute of Emomology, Academia Sinica |
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| Abstract: | The population dynamics of cotton aphid Aphis gossypii on cotton in Sheshan region (Shanghai suburb) in summer of 1983 is described. From early July to early Septemper when the cotton was in the square-boll stage the aphid population grew into a size about 10 times that in the same period of the previous year and the density peaked to about 6.3 thousand per plant. The tendency of population growth is shown in Fig. 1. The change of age Structure in "the population was investigated. It was revealed that the decline in percentage of the first instar nymphs was caused by the reduction of birth pate and the decline in percentage of the second instar nymphs in population of high density was due to the increased mortality of the first instar nymphs. As time went on the percentages of the third and fourth instar nymphs would rise in groups of different population densities. Finally the percentage of adults would rise in groups of low density but would decrease in groups of high density because of the emigration of the winged forms which appeared there in a higher proportion.The change of age structure in aphid populations bore an intimate relation to the percentage of parasitizatiou by Trioxys spp. and Aphelinus sp. The first and second instar nymphs were rarely parasitized; therefore, the percentage of parasitization would rise when the proportion of young instar nymphs decreased. The percentage of parasi-tization differed with aphid densities on the leaves but not with the position of the leaves-on the plants. |
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| Keywords: | Aphis gossypei-population dynamics-population age structure-percentage of parasitization |
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