Effect of ethylene dibromide on the control of white grubs and its impact on cordyceps in soils of the TPC Sugarcane Estate Moshi, Tanzania

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dc.contributor.authorKapama, Juma Tuvvelango
dc.date.accessioned2026-06-11T10:35:12Z
dc.date.available2026-06-11T10:35:12Z
dc.date.issued2001
dc.descriptionDissertation
dc.description.abstractThe populations of white grub pest of sugarcane, and that of Cordyceps, a naturally occurring fungal pathogen of white grubs, were determined in the four fields of the TPC sugarcane estate. The effects of ethylene dibromide (EDB), a commercially used soil fiiniigant, was assessed in controlling the white grubs and its impact on Cordyceps. Also the contribution of Cordyceps as the biocontrol agent of white grubs was evaluated both in fields and in the laboratoiy. White grubs populations (in the four fields) varied significanlly among four selected fields with grub densities vaiying from 25 000 to 93 000 grubs per hectare. These variations were possibly due to difierences in field location and soil types and also the number of crop ratoons. Similarly the populations of Cordyceps differed significantly between fields ranging (Yom 600 to 4000 Cordyceps clavac per hectare. The variations were attributed by initial population of white grubs, and soil properties. Ethylene dibromide significantly reduced the populations of both white grubs and Cordyceps in the treated plots, with maximum impacts at the third week after EDB application. In the laboratory, reduction in the population of white grubs by EDB was consistent to the sliding scale of concentration. Although EDB reduced significantly the germination of the Cordyceps clavac from infected cadavers, its effect on fungal growth and the branching of genriinated clavae were not significant. Although estimated mortality of white grubs caused by Cordyceps in stress rearing experiment was low (0.27-27%), from field surveys the contribution of the fungus as a natural control agent of white grubs was very high (54-94%). Studies on the effect of EDB on non target organisms
dc.description.sponsorshipNorwegian Agency for Development Cooperation (NORAD)
dc.identifier.urihttps://www.suaire.sua.ac.tz/handle/20.500.14820/7646
dc.language.isoen
dc.publisherSokoine University of Agriculture
dc.subjectSugarcane
dc.subjectEntomogenous fungi
dc.subjectCochliotis melolonthoides
dc.titleEffect of ethylene dibromide on the control of white grubs and its impact on cordyceps in soils of the TPC Sugarcane Estate Moshi, Tanzania
dc.typeThesis

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