Tea Farmers' Perceptions of the Influence of Climate Variability on Dodder Occurrence in Nandi County, Kenya
Abstract
Climate variability continues to adversely impact agricultural systems globally. From the literature, it is reported that there has been an unprecedented emergence of pests and diseases associated with climate change and variability among other factors. In Kenya, crop cultivation and yield are affected primarily by changing climatic conditions, pests, and diseases. Of major concern in counties of Kenya, are the impacts of climate variability and parasitic dodder (Cuscuta spp.) on tea cultivation and production. From the literature, little is reported on the continuing invasion and effects of parasitic dodder on tea farming. This study aimed to assess tea farmer perceptions on the role of climate variability on the occurrence of dodder in Nandi. An exploratory survey design was utilized for this study. Using the Yamane Formula, a sample size of 392 was drawn from the Kenya Tea Development Agency tea farmers to represent the study. Primary data obtained from the administered questionnaires was extracted, collated, classified, and analysed (p≤0.05) with the aid of the Statistical Package of Social Sciences. Rainfall and temperature data for the County was obtained from the Kenya Meteorological Department from 1992 to 2022. Mann-Kendall Trend Analysis showed a significant increase in temperature denoted by a Sen’s slope= 0.031 and a strong positive correlation of Kendall’s Tau 0.554 indicated an increase at p<0.000. Rainfall showed an increasing trend Sen’s slope= 5.618 was not statistically significant at p= 0.341 with a weak correlation of Kendall’s Tau= 0.123. On the influence of rainfall and temperature on dodder occurrence, 95.6%, and 68.9% of the respondents perceived that long rainy (March to May) and cold (June to August) seasons increased its intensity. While 69.8% of the respondents perceived a moderate intensity of dodder during the hot season (December to February). In conclusion, climate variability has influenced the spread of dodder on tea farms. The study recommends further research to examine the effectiveness of different Integrated Pest Management strategies under varying climate conditions.
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Bett, G. K. (2018). An Assessment of the Effects of Climate Variability on Tea Production in Kericho County: A Case Study of James Finlay’s (Kenya) Limited Tea Estates, Kericho, Kenya [Masters Dissertation, University of Nairobi]. http://erepository.uonbi.ac.ke/handle/11295/104740
CADP. (2019). 2020-2021 Nandi County Annual Development Plan. https://repository.kippra.or.ke/bitstream/handle/123456789/897/2020-2021%20Nandi%20County%20ADP.pdf?sequence=1andisAllowed=y
Cai, C., Xiao, J., Wan, J., Ren, Z., Kleunen, M. van, & Li, J. (2022). Implications of climate change for environmental niche overlap between five Cuscuta pest species and their two main Leguminosae host crop species. Weed Science, 70(5), 543–552. https://doi.org/10.1017/wsc.2022.45
Chepkirui, W. (2020). Effects Of Climate Variability On Dodder Invasion, Distribution And Management In Belgut Area Of Kericho County, Kenya. 95 [Masters Dissertation, Kenyatta University].
Dawson, J. H., Musselman, L. J., Wolswinkel, P. I. E. T. E. R., & Dorr, I. N. G. E. (1994). Biology and control of Cuscuta. https://scholar.google.com/scholar_lookup?hl=enandvolume=6andpublication_year=1994andpages=265- 317andjournal=Reviews+of+Weed+Scienceandauthor=JH+Dawsonandauthor=LJ+Musselmanandauthor=P+Wolswinkelandauthor=I+Dorrandtitle=Biology+and+control+of+Cuscuta
Finch, D. M., Butler, J. L., Runyon, J. B., Fettig, C. J., Kilkenny, F. F., Jose, S., ... & Amelon, S. K. (2021). Effects of climate change on invasive species. Invasive species in forests and rangelands of the United States: a comprehensive science synthesis for the United States forest sector, 57-83.
IPCC. (2021). Climate change is widespread, rapid, and intensifying. https://www.ipcc.ch/2021/08/09/ar6-wg1-20210809-pr/
Kagezi, G., Kyalo, G., Kobusinge, J., Nkuutu, E., Baluku, J., Arinaitwe, G., & I. Niyibigira, E. (2021). A Rapid Assessment of the Invasive Dodder Weed, Cuscuta Spp. On Robusta Coffee, Coffea robusta in Busoga Coffee Growing Sub-Region, Eastern Uganda. East African Scholars Journal of Agriculture and Life Sciences, 4(3), 55– 66. https://doi.org/10.36349/easjals.2021.v04i03.003
Karki, S., Burton, P., & Mackey, B. (2020). The experiences and perceptions of farmers about the impacts of climate change and variability on crop production: A review. Climate and Development, 12(1), 80– 95. https://doi.org/10.1080/17565529.2019.1603096
Kendall, M.G. 1975. Rank Correlation Methods, 4th edition, Charles Griffin, London.
Kirui, W., Muthama, N., John, Ngaina, N., Joshua, & Karuku, C. G. (2020). Spatial-Temporal Characteristics of Past and Projected Climate Over Dairy Production Zones: A Case of Nandi County, Kenya. Journal of Environment and Earth Science. https://doi.org/10.7176/JEES/10-6-06
Mairura, F. S., Musafiri, C. M., Kiboi, M. N., Macharia, J. M., Ng’etich, O. K., Shisanya, C. A., Okeyo, J. M., Mugendi, D. N., Okwuosa, E. A., & Ngetich, F. K. (2021). Determinants of farmers’ perceptions of climate variability, mitigation, and adaptation strategies in the central highlands of Kenya. Weather and Climate Extremes, 34, 100374. https://doi.org/10.1016/j.wace.2021.100374
Mann, H. B. 1945. Non-parametric tests against trend. Econometrica 13:163-171.
Masanga, J., Mwangi, B. N., Kibet, W., Sagero, P., Wamalwa, M., Oduor, R., Ngugi, M., Alakonya, A., Ojola, P., Bellis, E. S., & Runo, S. (2021). Physiological and ecological warnings that dodders pose an exigent threat to farmlands in Eastern Africa. Plant Physiology, 185(4), 1457–1467. https://doi.org/10.1093/plphys/kiab034
McRitchie, J. J. (1990). Dodder A Parasitic Plant Pest. Bureau of Plant Pathology.
Mong’o, F. J., Koske, J. K., & Muriuki, J. N. (2024). Dodder infestation on Tea in Nandi County, Kenya. International Journal of Research in Environmental Science, 10(3), 27– 32. https://doi.org/10.20431/2454- 9444.1003003
NCIDP. (2018). Nandi County Integrated Development Plan 2018-2022. Kippra.or.Ke. https://repository.kippra.or.ke/handle/123456789/900
NCIDP. (2023). Nandi County Integration Development Plan 2023-2027. https://repository.kippra.or.ke/bitstream/handle/123456789/4349/NANDI%20County%20CIDP%202023- 2027.pdf?sequence=1andisAllowed=y
Ngare, I. O., Koske, J. K., Muriuki, J. N., Gathuku, G. N., and Adiel, R. K. (2020). Spatial Ramifications of Dodder Infestation on Urban Ornamentals in Mombasa, Kenya. Current Urban Studies, 08(04), Article 04. https://doi.org/10.4236/cus.2020.84029
Nyoni, R., & Bayo, M. J. (2021). Invasion and Dispersal of Cuscuta reflexa Weed in Kilosa District in Morogoro Region, Tanzania. ResearchGate, 10(1). https://doi.org/10.21275/SR20728130549
Olszewski, M. (2019). Diversity and Evolution of Seeds in Cuscuta (dodders, Convolvulaceae): Morphology and structure. [Thesis and Dissertations]. https://scholars.wlu.ca/etd/2186
Omasaki, S. K., & Mokoro, A. N. (2023). Farmers’ Perception and Adaptation to Climate Variability in Nandi County, Kenya. African Journal of Education, Science and Technology. 7. https://doi.org/10.2022/ajest.v7i3.876
Orwah, P. A. (2022). Occurrence and impact of golden dodder (Cuscuta campestris Yunker), invasion on species diversity of trees and shrubs in Homa Bay County, Kenya [Masters Dissertation, Rongo University]. http://repository.rongovarsity.ac.ke/handle/123456789/2487
Phophi, M. M., Mafongoya, P., & Lottering, S. (2020). Perceptions of Climate Change and Drivers of Insect Pest Outbreaks in Vegetable Crops in Limpopo Province of South Africa. Climate, 8(2), Article 2. https://doi.org/10.3390/cli8020027
Sandler, H. A., & Ghantous, K. (2019). Dodder: Biology and Management. https://hdl.handle.net/20.500.14394/9127
Sarić-Krsmanović, M. (2020). Field Dodder: Life Cycle and Interaction with Host Plants. In J.-M. Mérillon and K. G. Ramawat (Eds.), Co-Evolution of Secondary Metabolites (pp. 101–120). Springer International Publishing. https://doi.org/10.1007/978-3-319-96397-6_58
Sarić-Krsmanović, M. M., & Vrbnicanin, S. P. (2015). Field dodder – How to control it? Pesticides and Phytomedicine, 30(3), Article 3. https://www.aseestant.ceon.rs/index.php/pif/article/view/8867
Twahirwa, A., Oludhe, C., Omondi, P., Rwanyiziri, G., & Sebaziga Ndakize, J. (2023). Assessing Variability and Trends of Rainfall and Temperature for the District of Musanze in Rwanda. Advances in Meteorology, 2023, e7177776. https://doi.org/10.1155/2023/7177776.
Wallingford, P. D., Morelli, T. L., Allen, J. M., Beaury, E. M., Blumenthal, D. M., Bradley, B. A., Dukes, J. S., Early, R., Fusco, E. J., Goldberg, D. E., Ibáñez, I., Laginhas, B. B., Vilà, M., & Sorte, C. J. B. (2020). Adjusting the lens of invasion biology to focus on the impacts of climate-driven range shifts. Nature Climate Change, 10(5), Article 5. https://doi.org/10.1038/s41558-020-0768-2
Yamane, T. (1967) Statistics: An Introductory Analysis. 2nd Edition, Harper and Row, New York.
Yego, M. J., Mwasi, S. M., Sudoi, V., & Cheramgoi, E. (2022). Effect of field dodder (Cuscuta campestris Yunck.) on tea clones’ growth parameters and yield in Nandi County, Kenya. Africa Environmental Review Journal, 5(1).
Zaroug, S. M., Zahran, B. A. E., Abbasher, A. A., and Aliem, A. A. E. (2014). Host range of field dodder (Cuscuta campestris Yuncker) and its impact on onion (Allium cepa L.) cultivars grown in Gezira state Sudan. ResearchGate. https://www.researchgate.net/publication/322244157_Host_range_of_field_dodder_Cuscuta_campestris_Yuncker_and_its_impact_on_onion_Allium_cepa_L_cultivars_grown_in_Gezira_state_Sudan
Zhang, J., Li, S., Li, W., Feng, Z., Zhang, S., Zheng, X., Xu, Y., Shen, G., Zhao, M., Cao, G., Wu, X., and Wu, J. (2024). Large-scale interplant exchange of macromolecules between soybean and dodder under nutrient stresses. Plant Diversity, 46(1), 116–125. https://doi.org/10.1016/j.pld.2023.11.005
Zhuang, H., Li, J., Song, J., Hettenhausen, C., Schuman, M. C., Sun, G., Zhang, C., Li, J., Song, D., and Wu, J. (2018). Aphid (Myzus persicae) feeding on the parasitic plant dodder (Cuscuta australis) activates defense responses in both the parasite and soybean host. New Phytologist, 218(4), 1586–1596. https://doi.org/10.1111/nph.15083
Copyright (c) 2025 Faith Jepchirchir Mong’o, James Kibii Koske, PhD, John Njagi Muriuki, PhD
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