Efficacy of trianum-p as a biopesticide for the management of major soil-borne diseases of French beans in Kenya
Kinyua, Z. M.
Kariuki, G. M.
Chege, S. W.
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The effect of Trianum-P (Trichoderma harzianumT-22) on major soil-borne diseases of French beanshas been studied in Kenya. A total of four (4) trials were carried out during a period of one year in Naivasha,Kenya (under greenhouse conditions) and Mwea, Kenya (under field conditions) to evaluate the efficacy of T. harzianumin the management of soil-borne diseases of Frenchbeans caused by Fusarium, Pythium and Rhizoctonia spp.. A preliminary survey had shown that both the Naivasha and Mwea sites had high incidence of these pathogens. A total of six treatments were done in each of these sites and the trial was repeated once in each site, making a total of 4 seasons. The treatments were: 30 g of Trianum-P per 1000 planting bags,15 g Trianum-P per 1000 planting bags, 5 g of Trianum-P per 1kg of seed (seed treatment), 15 g of Rootgard per 1000 planting bags, 23 ml of carbendazim per 2000 planting bags and an untreated control. The second application for each of the treatments except for the carbendazim was done again after 35 days. There were significant differences in terms of root/shoot growth and root colonization by T. harzianumin all the Trianum-P treated plots. The study confirms that T. harzianumenhances root growth of plants, and therefore renders the soil-borne pathogens ineffective. Root samples thatwere taken for plant pathogen DNA analysis furtherconfirmed that T. harzianumis antagonistic to soil-borne pathogens. An important attribute noted in this study is that T. harzianumreadily establishes itself upon application in thepumice/soil and would therefore be available in the subsequent cultivations. This is a very important attribute of any biological control agent. Based on the findings of this study, Trianum-P has now been registered as a biopesticide in Kenya