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The population of the apple leaf miner phyllonorycter ringoniella lepidoptera lithocolletidae 3. analyses of mortality factors



The population of the apple leaf miner phyllonorycter ringoniella lepidoptera lithocolletidae 3. analyses of mortality factors



Applied Entomology and Zoology 14(2): 137-148



Based on life table studies for the apple leaf miner, P. ringoniella Matsumura, 5 mortality factors which were important in reduction of larvae were chosen. The characteristics of their operations were analyzed with regard to 2 changes of the mortality rates in accordance with the changes of the numbers of the living larvae per leaf, and frequency distribution of deaths per leaf in comparison with the binomial series. Mortality during the sap feeding stage was dependent on density per leaf. This was due mainly to cannibalism. Operations of other factors were independent of the numbers of larvae per leaf. Distributions of deaths due to unknown factors operating on the sap feeding and tissue feeding stages and those of the parasitism of Sympiesis sp. were nearly fitted to the binomial series, which suggested that reductions of larvae due to these factors occured independently of each other in a given leaf. Distributions of parasitism by Holcothorax testaceipes and those of deaths due to cannibalism did not follow the binomial series.

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Accession: 006736997

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