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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730
EISSN: 2072-6589
Vol. 13, No. 3, 2005, pp. 209-214
Bioline Code: cs05021
Full paper language: English
Document type: Research Article
Document available free of charge

African Crop Science Journal, Vol. 13, No. 3, 2005, pp. 209-214

 en Efficacy of Synthetic and Non-Synthetic Fungicides Against Stem Canker Disease of Tea
Oniang’o, M.O; Khare, K.B; Achwanya, O.S & Otieno, W

Abstract

Tea ( Camellia sinensis check for this species in other resources ) is a major source of foreign exchange in Kenya. Its production is greatly affected by the stem canker disease ( Phomopsis theae check for this species in other resources ) and, thus, the need to develop effective control strategies. The efficacy of three fungicides (copper oxychloride, mancozeb and benomyl at concentrations of 10, 25, 50, 100 ppm for each, and acqueous leaf extracts (10% w/v) of four indigenous plants, sage brush ( Lippia javanicum check for this species in other resources ), stinging nettle ( Urtica massaica check for this species in other resources ), savory ( Satureia biflora check for this species in other resources ) and Kenya green heart ( Warburgia ugandensis check for this species in other resources ) were evaluated in vitro against two isolates (P 228 and P 794) of Phomopsis theae Petch, the cause of stem canker disease of tea. The variables used for the study of growth inhibition were colony diameter and number of pycnidia produced on malt extract agar, and dry weight of thallus biomass in liquid malt extract. The three fungicides differed significantly (P<0.01) from each at all concentrations. Benomyl was the most effective as it completely inhibited the two isolates of P. theae in all concentrations. Mancozeb was the next best but it was effective only at high concentrations. Copper oxychoride was found least effective even at high concentrations. Aqueous leaf extract of W. ugandensis was the most effective and completely inhibited mycelial growth, biomass accumulation and pycnidial production even at very low concentrations.

Keywords
Camellia sinensis, fungicides, mycelial growth, Phomopsis theae, plant extracts

 
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