Controlling anthracnose of banana and papaya through gras (generally regarded as safe) compounds
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Date
2013-07-04
Authors
Gunawardhena, R. D. U. N.
Alahakoon, P. W.
De Costa, D. M.
Jayawardhana, N. H.
Journal Title
Journal ISSN
Volume Title
Publisher
The university of Peradeniya
Abstract
Colletotrichum musae and Colletotrichum gloeosporioides are the causative fungi of anthracnose of banana and papaya, respectively. Use of non-fungicidal approaches for the control of postharvest pathogens have become an emerging trend due to environmental and health hazards caused by application of fungicides. Experiments were conducted at the Fruit Crops Research and Development Centre, Horana to evaluate several non-fungicidal measures for the control of banana and papaya anthracnose.
In the present study, efficiency of six GRAS (Generally Regarded As Safe) compounds were evaluated for the control of C. musase and C. gloeosporioides in comparison to a recommended fungicide (i.e. Chlorothaolonil 500SC).
Sodium propionate <Formula> at a concentration of 30000 ppm, Potassium sorbate <Formula> at 20000 ppm, Sodium bicarbonate <Formula> at 40000 ppm, Sodium metabisulphite <Formula> at 1500 ppm, Cinnamaldehyde <Formula> at 5 ppm and Clove Oil <Formula> at 4 ppm, achieved complete growth inhibition of C. gloeosporioides in papaya. This was similar to the control achieved by the recommended fungicide, Chlorothalonil. Minimum effective concentrations of GRAS compounds which were able to cause 100% growth inhibition of C .gloeosporioides were applied for isolates of C.musae from banana (variety Kolikuttu). All the selected concentrations of GRAS compounds had the ability to cause 100% growth inhibition of C.musae isolated from the banana variety Kolikuttu. Hence C.gloeosporioides and C.musae from banana variety kolikuttu can be controlled by the same treatments under in vitro conditions. Under in vivo conditions, symptom development could be completely controlled by sodium metabisulphite (1500 ppm), sodium propionate (30000 ppm) and Chlorothalonil 500SC (2 ml/l) on papaya or banana fruits inoculated with the respective species of Colletotrichum. On the other hand, the minimum effective concentrations of the other GRAS compounds did not control the fungi completely in inoculated fruits in vivo.
Based on the results of the present study it can be concluded that the tested GRAS compounds have the potential to be developed as non-pesticidal methods of anthracnose control in banana and papaya.
Description
Keywords
CONTROLLING , ANTHRACNOSE , BANANA , PAPAYA , THROUGH GRAS , Colletotrichum musae , Colletotrichum gloeosporioides
Citation
Peradeniya University Research Sessions Purse 2012, Book of Abstractsm University of Peradeniya, Sri Lanka, Vol-17, July.4.2013 P 223