Studies on the causes of a leaf-spotting disease on Grevillea robusta in Yala and Kodera Forests in Nyanza Province, Kenya.

Abstract

This thesis is a study of the Grevillea robusta A. cunn. EXR. Br. is remarkably the most widely grown agroforestry tree in most countries. It has an increasing demand among farmers because of the many benefits it provides. A leaf-spotting disease and abnormal growths on G. robusta which had been observed in Yala and Kodera ICRAF forest plots in Nyanza Province, Kenya were studied. The study comprised symptomology; isolation and identification of the pathogen; inoculation of G. robusta seedlings; tissue and soil analysis. The spots were descruved as urregykar ti curcykar. Two main fungal species were ilolated and identified as Phyllosticta spp. and Pestalotia spp.