UON-PHD Thesis-Integration of Soil Fertilizers for the Mgt of Coffee Pests-H.M.MUGO 2010

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University of Nairobi
Overreliance on residual insecticides to manage insect pests such as Coffee Berry Borer (CBB), Hypothenemus hampei (Ferrari) a primary pest of coffee, has resulted in many environmental and human health problems. Such problems related to CBB management among other pests signified the need to develop improved and effective insect pests control strategies. Poor plant health compromises crop yield and quality while possible temporal and spatial changes in the distribution of pests affect choice of insecticides used by farmers. Current study investigated the viability of a three-pronged coffee farm management strategy that combines use of selective insecticides, conservation of biocontrol agents and improved plant health through a field trial that was laid out at Coffee Research Station (CRS) for three years (2006- 2008). The study focused on H hampei, a primary/major coffee insect pest and Coffee thrips, Diarthrothrips coffeae Williams as secondary/minor one. Prior to this, common insect pests and predacious mites present in coffee growing agro-ecozones (UMl, UM2 and UM3) were established and their distributions determined using a field survey. Existence of predacious mites with resistance to chlorpyrifos commonly used in coffee to control primary pests was determined from mites populations collected from coffee farms and multiplied in the laboratory before bioassay on their sensitivity to chlorpyrifos was conducted.