Inhibitory Effect of Bioagents, Plant Extracts and Fungicides on the in vitro Growth of Asperisporium caricae (speg.) Maubl causing Papaya Black Spot Disease

Author: Pooja S. Patel, V.B. Sanath Kumar and N. Kiran Kumar

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Abstract

Papaya (Carica papaya L.) is a tropical fruit having commercial importance because of its nutritive and medicinal value. One of the reason for the low yiled of papaya is due to the infection of Asperisporium caricae which causes black spot disease both on leaves and fruits and responsible for both pre and post harvest losses of fruits. As this disease is profoundly affecting the market value of the fruit, it is initially essential to validate an in vitro effectiveness of different botanicals and bioagents on the papaya fruit, as they are eco-friendly, cost-effective and sustainable efficient strategy to manage the disease including different chemicals for effective control of disease. Among different bioagents, Trichoderma asperellum (67.30%) inhibited highest mycelial growth of the pathogen followed by T. hamatum (62.17%), also fungal bioagents showed greater per cent of inhibition in comparison with bacterial bioagents. The plant extract Allium sativum (32.36%) was highly effective against A. caricae at 15 per cent concentration and was significantly superior over Prosopis juiflora (25.20%). Among different contact and systemic fungicides, A. caricae was completely (100%) inhibited at highest concentration (2000ppm) by chlorothalonil and even at least concentration (75 ppm) by carbendazim.

Keywords

Bioagents, Black spot disease, fungicides, Papaya, Plant extracts

Conclusion

Plant diseases are an inherent component of an agro eco-system. So, management of these diseases is not only based on the principle of eradication, but also maintaining the damage or loss that occurs below an economic injury level. Due to the absence of resistant cultivars, use of plant extracts, bioagents and chemicals to manage the diseases is an age-old practice. When there is an outbreak of epidemic for any reason perhaps use of fungicides is one of the best choice available. Hence, these fungicides have to be used judiciously according to the need and type of organism present in an ecosystem. Besides the chemical control, biological method of control is an effective, environmentally friendly and an alternative approach for disease management. Therefore, bioassay of fungicides, bioagents and plant extracts provides a basis for preliminary evaluation against a pathogen within the shortest period of time and therefore, it will be helpful for further evaluation of fungicides, bioagents and plant extracts in field conditions.

References

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How to cite this article

Pooja S. Patel, V.B. Sanath Kumar and N. Kiran Kumar (2023). Inhibitory Effect of Bioagents, Plant Extracts and Fungicides on the in vitro Growth of Asperisporium caricae (speg.) Maubl causing Papaya Black Spot Disease. Biological Forum – An International Journal, 15(4): 47-55.