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| dc.contributor.author | Yeshiwas, Birhanu | |
| dc.date.accessioned | 2026-10-08T11:25:52Z | |
| dc.date.available | 2026-10-08T11:25:52Z | |
| dc.date.issued | 2024-06 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/17449 | |
| dc.description.abstract | In Ethiopia, mango (Mangifera indica L.) is the most widely grown fruit crop. Including the study area, Mango production in Ethiopia is damaged by various insect pests, one of them is the white mango scale, which is the most significant insect pest that causes severe damage to mango tree. It spread and now causes a loss between 50% and 100% to the production of mangoes by affecting the financial gains of mango growers. Therefore, the objective of this study was to examine the population dynamics of the white mango scale, as well as the impact of some basic climatic factors on the population density of the white mango scale in the study areas. The study on the dynamics of Aulacaspis tubercularis was carried out in the north Gojjam administration zone of Ethiopia from December 2022 to November 2023. Bahir Dar zuria and North Mecha district were purposefully selected for the study of this investigation. From each woreda, two representative sites or orchards were selected for the study. From each site/orchard, five mango trees were purposefully selected, and twelve mango leaves were plucked monthly from each mango tree (four at the upper, four at the middle, and four at the lower portion) at each of the four cardinal directions of the tree (female male, egg, crawlers were counted and recorded). Data related to meteorology, including maximum and minimum temperatures, mean temperature, relative humidity, and rainfall, was obtained from the Ethiopian National Meteorological institute and analyzed using R-Statistics software version 4.3.1. The results of the study confirmed that white mango scale was identified in all sampled study areas throughout the study period with a fluctuating population density. The mean number of white mango scale showed significant differences (p< 0.05) among the study months in each location, tree directions and canopy positions. The population density of white mango scale was significantly higher at Dek than in the rest of the study areas (p<0.05). There was a marked increase in white mango population density from March to mid-June with the general trend of slight to moderately increased precipitation. In contrast, there was a swift decrease in the white mango population from mid-June to September, followed by prolonged heavy precipitation. The correlation coefficient between the white mango scale population and some basic weather factors, including maximum temperature, minimum temperature, and relative humidity, showed a weak to very strong positive correlation and a weak positive to weak negative correlation with rain fall in the four study areas. The results of the study showed that white mango scale is distributed in all four cardinal directions, with the white mango scale insect preferring the southern cardinal direction. Furthermore, the study investigated whether the buildup and decline of the white mango scale are affected by basic climatic factors such as temperature and rainfall, relative humidity, and cardinal direction differences, where the other contributing factors need to be investigated further. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Agricultral Entmology | en_US |
| dc.title | Seasonal Population Dynamics of White Mango Scale (Aulacaspis tubercularis (Hemiptera: Diaspididae) on mango in North Gojam, Amhara Region, Ethiopia | en_US |
| dc.type | Thesis | en_US |
