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  • Title: Potential of plant extracts in combination with bacterial antagonist treatment as biocontrol agent of red rot of sugarcane.
    Author: Jayakumar V, Bhaskaran R, Tsushima S.
    Journal: Can J Microbiol; 2007 Feb; 53(2):196-206. PubMed ID: 17496967.
    Abstract:
    Plant extracts and antifungal microorganisms were tested singly and in combination for biocontrol of sugarcane red rot disease (Colletotrichum falcatum) using two sugarcane (Saccharum officinarum L.) cultivars, CoC671 and CoC92061, in pot and field experiments. Leaf extracts of Abrus precatorius and Bassia latifolia and the rhizome extract of Curcuma longa reduced Colletotrichum falcatum mycelial growth by 80%, 58%, and 57%, respectively. Although sugarcane- planting materials (setts) treated individually with either Pseudomonas fluorescens Md1 or A. precatorius in pot experiments had the lowest incidences of red rot, 20.1% and 24.2%, respectively, none of the plant extracts were effective in the field. In contrast, when the two varieties were tested separately in two field locations, the setts treated with A. precatorius in combination with a spray or soil application of P. fluorescens Md1 had the lowest incidence of red rot in both locations, e.g., 3.1% and 3.4% incidence for CoC92061 in one location, and had a similar response to the chemical control. The results suggest the applicability of plant-based extracts for the suppression of sugarcane red rot disease in the field as an environment-friendly tool in combination with antagonists.
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