ODEM  Vol.3 No.2 , May 2015
Health Impact of Pesticides on Residents and Horticultural Workers in the Lake Naivasha Region, Kenya
Abstract: The horticultural sector has undergone tremendous growth in Kenya and is now the second largest foreign income earning sector in the country. Lake Naivasha is the hub of large scale horticultural farming in Kenya. This growth coupled with increased use of pesticides, may increase the possibility of pesticide exposure and its associated risks to workers and residents of the region. The purpose of this study was to assess the symptoms commonly experienced by residents of Naivasha town and their possible association to pesticide exposure. Purposive sampling of residents from Kamere, Kwa Muia, Kioto and Karagita was performed, as these residential areas have significant numbers of flower farm workers. By random selection, a total of 801 community members were recruited to participate in the study and data was collected by completing the prepared questionnaire and from clinical examinations. Results indicate that several residents exhibited respiratory; skin, joints and bones; and nervous system symptoms. We found a higher frequency of symptoms among planters, weeders, harvesters than in sprayers working in horticultural farms. We recommend training to planters, weeders, harvesters who are mainly women (61.6%) in this study concerning pesticide use as do sprayers; and second, longer reentry times between the last spraying of pesticide and entry of these workers is warranted, particularly in greenhouses. In this regard, reentry times for greenhouses and fields established for specific pesticides in Europe, North America, Japan or Australia should be adapted by Kenya, and these guidelines enforced by the Government of Kenya to reduce exposure to pesticides within this vulnerable work group. These workers should also use protective clothing including gloves and masks at all times while handling chemicals or recently sprayed plants or flowers. It would also be prudent for flower farm owners to introduce an integrated pest management regime to reduce pesticide use andworker exposures. Further research is required both to identify validated biomarkers that can reliably be used to identify pesticide exposure prior to the occurrence of acute toxicity; and to follow up individual cases of known exposures for chronic health effects.
Cite this paper: Tsimbiri, P. , Moturi, W. , Sawe, J. , Henley, P. and Bend, J. (2015) Health Impact of Pesticides on Residents and Horticultural Workers in the Lake Naivasha Region, Kenya. Occupational Diseases and Environmental Medicine, 3, 24-34. doi: 10.4236/odem.2015.32004.

[1]   EPA 2006-2007 Pesticide Market Estimates: Usage.

[2]   World Health Organization (WHO) United Nations Environmental Program (2001) Public Health Impact of Pesticides used in Agriculture, Geneva.

[3]   Miller, G.T. (2004) Sustaining the Earth. 6th Edition. Thompson Learning, Inc., Pacific Grove.

[4]   Calvert, G.M., Karnik, J., Mehler, L., Beckman, J., Morrissey, B., Sievert, J., Barrett, R., Lackovic, M., Mabee, L., Schwartz, A., Mitchell, Y. and Moraga-McHaley, S. (2008) Acute Pesticide Poisoning among Agricultural Workers in the United States, 1998-2005. American Journal of Industrial Medicine, 51, 883-898.

[5]   WHO/UNEP (1990) Public Health Impact of Pesticides Used in Agriculture. WHO, Geneva, 85-86.

[6]   Magauzi, R., Mabaera, B., Rusakaniko, S., Chimusoro, A., Ndlovu, N., Tshimanga, M., Shambira, G., Chadambuka, A. and Gombe, N. (2011) Health Effects of Agrochemicals among Farm Workers in Commercial Farms of Kwekwe District, Zimbabwe. Pan African Medical Journal, 9, 26.

[7]   Subashiny, N. and Thiruchelvam, S. (2008) Knowledge of Farmers about Pest Management Practices in Pambaimadu, Vavuniya District: An Ordered Probit Model Approach. Sabaramuwa University Journal, 8, 79-89.

[8]   Sanborn, M.D., Cole, D., Abelsohn, A. and Weir, E. (2002) Identifying and Managing Adverse Environmental Effects (Pesticides). CMAJ, 166, 1431-1436.

[9]   Pesticide Action Network of North America Pesticide Database (Updated June, 2014).

[10]   Miranda, J., McConnell, R., Delgado, E. and Cuadra, R. (2002) Tactile Vibration Threshold after Acute Poisonings with Organophosphate Insecticides. International Journal of Occupational and Environmental Health, 8, 212.

[11]   Ohayo-Mitoko, G.J.A., Kromhout, H., Simwa, J.M., Boleij, J.S.M. and Heederik, D. (2000) Self Reported Symptoms and Inhibition of Acetylcholinesterase Activity among Kenyan Agricultural Workers. Occupational and Environmental Medicine, 57, 195-200.

[12]   Miranda, J., McConnell, R., Wessling, C. and Cuadra, R. (2004) Muscular Strength and Vibration Threshold during Two Years after Acute Poisoning with Organophosphate Insecticides. Occupational and Environmental Medicine, 61, 4.

[13]   Safi, J.M. (2002) Association between Chronic Exposure to Pesticides and Recorded Cases of Human Malignancy in Gaza Governorates (1990-1999). Science of the Total Environment, 284, 75-84.

[14]   Choi, S., Yoo, S. and Lee, B. (2004) Toxicological Characteristics of Endocrine-Disrupting Chemicals: Developmental Toxicity, Carcinogenicity, and Mutagenicity. Journal of Toxicology and Environmental Health, Part B: Critical Reviews, 7, 1-23.

[15]   Galloway, T. and Handy, R. (2003) Immunotoxicity of Organophosphorous Pesticides. Ecotoxicology, 12, 345-363.

[16]   Del Prado-Lu, J.L. (2007) Pesticide Exposure, Risk Factors and Health Problems among Cutflower Farmers: A Cross Sectional Study. Journal of Occupational Medicine and Toxicology, 2, 9.

[17]   Macharia, I.N., Mithöfer, M. and Waibel, H. (2009) Potential Environmental Impacts of Pesticides Use in the Vegetable Sub-Sector in Kenya. African Journal of Horticultural Science, 2, 138-151.

[18]   Kenya Flower Council (2011) Kenya Flower Council Activity Report 2011-2012. Nairobi.

[19]   PCPB (2010) Pest Control Products Registered for Use in Kenya. 6th Edition, Nairobi.

[20]   Kenya Republic of Kenya (2010) Kenya Population and Housing Census, Vol. IA. Population Distribution by Administrative Units, 2009. Kenya National Bureau of Statistics.

[21]   Becht, R., Odada, E. and Higgins, S. (2006) Lake Naivasha: Experience and Lessons Learned Brief. International Institute of Geo-Information Science and Earth Observation (ITC), Enschede, University of Nairobi and Lake Naivasha Riparian Association Kenya.

[22]   Wesseling, C., Castillo, L. and Elinder, C.G. (1993) Pesticide Poisonings in Costa Rica. Scandinavian Journal of Work, Environment & Health, 19, 227-235.

[23]   Kesavachandran, C.N., Fareed, M., Pathak, M.K., Bihari, V., Mathur, N. and Srivastava, A.K. (2009) Adverse Health Effects of Pesticides in Agrarian Populations of Developing Countries. Reviews of Environmental Contamination and Toxicology, 200, 33-52.

[24]   Strong, L.L., Thompson, B., Coronado, G.D., Griffith, W.C., Vigoren, E.M. and Islas, I. (2004) Health Symptoms and Exposure to Organophosphate Pesticides in Farmworkers. American Journal of Industrial Medicine, 46, 599-606.

[25]   Issa, Y., Sham’a, F., Nijem, K., Bjertness, E. and Kristensen, P. (2010) Pesticide Use and Opportunities of Exposure among Farmers and Their Families: Cross-Sectional Studies 1998-2006 from Hebron Governorate, Occupied Palestinian Territory. Environmental Health, 9, 63.

[26]   Hanke, W. and Jurewicz, J. (2004) The Risk of Adverse Reproductive and Developmental Disorders Due to Occupational Pesticide Exposure: An Overview of Current Epidemiological Evidence. International Journal of Occupational Medicine and Environmental Health, 17, 223-243.

[27]   World Health Organization/United Nations Environment Programme (WHO/UNEP) (2008) Libreville Declaration on Health and Environment in Africa. Libreville.

[28]   Waddell, B.L., Zahm, S.H., Baris, D., Weisenburger, D.D., Holmes, F., Burmeister, L.F., et al. (2001) Agricultural Use of Organophosphate Pesticides and the Risk of Non-Hodgkin’s Lymphoma among Male Farmers (United States). Cancer Causes & Control, 12, 509-517.

[29]   Rosenstock, L., Keifer, M., Daniell, W.E., McConnell, R. and Claypoole, K., The Pesticide Health Effects Study Group (1991) Chronic Central Nervous System Effects of Acute Organophosphate Pesticide Intoxication. Lancet, 338, 223-227.

[30]   Damalasb, C.A., Telidis, G.K. and Thanos, S.D. (2008) Assessing Farmers’ Practices on Disposal of Pesticide Waste after Use. Science of the Total Environment, 390, 341-345.

[31]   Nag, S.K. and Raikwar, M.K. (2008) Organochlorine Pesticide Residues in Bovine Milk. Bulletin of Environmental Contamination and Toxicology, 80, 5-9.