n African Zoology - Population dynamics of (Coleoptera: Curculionidae: Scolytinae) on in the Lake Victoria Crescent agroecological zone of Uganda

Volume 51 Number 3
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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We studied the seasonal population dynamics of on for 24 months from June 2013 to May 2015 at the National Coffee Research Institute, Mukono, Uganda. Every month, we randomly sampled 20 infested twigs from different coffee trees on each of three experimental blocks, and dissected them to count different stages of per twig. We recorded monthly mean temperature and total rainfall. Seasonal fluctuations in numbers of different life stages of inside twigs over time were analysed with a general linear model. Ambient temperature and rainfall were used to predict changes in monthly mean counts by means of a multiple linear regression. The population of varied significantly across months and its major peak occurred from May to August. This variability was poorly explained by prevailing weather conditions with only the number of dead females correlated negatively with mean monthly temperature. Therefore, it may be suitable to apply management interventions against on in Uganda prior to May-August of each year to prevent the pest from attaining damaging levels. Further research is necessary to better understand the effect of weather variables on population dynamics of this insect pest.

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