Assessment of environmental pollution by residues of copper fungicides used on coffee in Arusha Region, Tanzania
| dc.contributor.author | Mzimba, Sada Bakari | |
| dc.date.accessioned | 2026-08-29T06:37:18Z | |
| dc.date.available | 2026-08-29T06:37:18Z | |
| dc.date.issued | 2012 | |
| dc.description | Dissertation | |
| dc.description.abstract | Bean bruchids Acanthoscelides obtectus (Say) and Zabrotes subfasciatus (Boheman) are the main storage pests of beans in Africa. Farmers in Tanzania have been using different pesticidal plants which were not uniform from different locations for many years to reduce damage in their produce. Laboratory studies were carried out to investigate the effectiveness of nine botanical extracts in controlling the two bruchid species. The study included plant species from Iringa, Kilimanjaro, Mbeya and Morogoro Regions. The insecticidal materials were extracted from Eucalyptus citriodora, Vernonia amygdalina, Telfairia pedata, Chenopodium ambrosioides. Neorautanenia mitis. Dolichos kilimandscharicus. Gnidia kraussiana, Zanha africana and Schinus mode. Powders of these plants were tested under the laboratory conditions, where doses commonly used by farmers were tested to identify plant species with superior characteristics. The experiment was set in a Completely Randomised Design to determine the optimum doses of five selected pesticidal plant formulations that can be recommended for protecting beans against bruchids. The effectiveness of the extracts was compared with Actellic Super Dust, a synthetic chemical commonly used for control of bean bruchids. The results show that, all plant species were potential in controlling A. obtectus. Two plant species namely N. mitis and C. ambrosioides, performed similar to synthetic Actellic Super Dust followed by Z. africana at the highest tested concentration (600 g/100 kg) to A. obtectus and Z. subfasciatus. Out of nine plant formulations evaluated on Z. subfasciatus only three were statistically different in their effectiveness compared to untreated beans. The study shows that C. ambrosioides and N. mitis have higher efficacy comparable to Actellic Super Dust followed by Z. africana. Hence, the plants can be used efficiently as the recommended insecticidal plants. However, further study is recommended to assess the insecticidal plants role in seed deterioration during storage, shelflife, pesticidal plant combination and toxicity to mammals. | |
| dc.description.sponsorship | Norwegian Agency for International Development (NORAD) | |
| dc.identifier.uri | https://www.suaire.sua.ac.tz/handle/20.500.14820/7944 | |
| dc.language.iso | en | |
| dc.publisher | Sokoine University of Agriculture | |
| dc.subject | Environmental pollution | |
| dc.subject | Copper fungicides | |
| dc.subject | Arumeru districts | |
| dc.subject | Arusha Region | |
| dc.subject | Tanzania | |
| dc.subject | Environmental pollution | |
| dc.title | Assessment of environmental pollution by residues of copper fungicides used on coffee in Arusha Region, Tanzania | |
| dc.type | Thesis |