Chemotherapy of rice blast (Pyricularia oryzae) under field conditions

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Research Paper 01/03/2022
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Chemotherapy of rice blast (Pyricularia oryzae) under field conditions

Saneela Arooj, Salman Ahmad, Muhammad Akhter
Int. J. Biosci.20( 3), 29-36, March 2022.
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Rice blast disease (RBD) is a potential threat in the rice belt of Punjab, Pakistan. The current research was planned on the objective to evaluate fungicides and their doses against P. oryzae in-vitro and in-vivo. Currently, management practices are inadequate to control RBD; subsequently, the blast is dominating in rice-growing areas of Pakistan. As RBD has a wide host range hence, eradication and crop rotation are of minute importance to control this disease. Henceforth, there is a persistent need to devise a substitutive approach for blast management. RBD is largely managed by three methodologies, viz., cultural practices, chemical control and by using resistant varieties. During the current study, six fungicides were evaluated in vitro against P. oryzae at three different doses 100ppm, 200ppm, 300ppm using the food poison technique. Amongst six fungicides, Nativo, containing trifloxystrobin 25% + tebuconazole 50%, and Azomide Super, containing difenoconazole and cyprodinil, proved to be best, at 200ppm, controlling P. oryzae in-vitro and in-vivo. In-vivo, Nativo and Azomide Super fungicides reduced RBD severity significantly to 87% and 83%, respectively. The current study revealed two fungicides, Nativo and Azomide, effective against P. oryzae at 200 ppm.


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