EVALUATION OF DIFFERENT PH ON THE GROWTH OF CORYNESPORA CASSIICOLA OF COTTON

Paras Sangani¹, Prashant B. Sandipan²*, R. K. Patel³, P. S. Patel⁴, Pushpa Ruwali⁵, Twinkle D. Manavadria⁶, Nirva Patel⁷ and Chitra Sharma⁸

^{1, 6 & 7} Department of Plant Pathology, N. M. College of Agriculture, Navsari Agricultural University (NAU), Navsari 396 450 (Gujarat), India

^{2 & 4} Main Cotton Research Station (MCRS), Navsari Agricultural University (NAU),

Surat 395 007 (Gujarat), India

³ Krishi Vigyan Kendra, Navsari Agricultural University (NAU), Surat 395 007 (Gujarat), India

⁵ Department of Biotechnology, M. B. Government P. G. College,

Haldwani 263 139, (Uttarakhand), India

⁸ International Horticulture Innovation and Training Centre, Durgapur,

Jaipur – 302 018 (Rajasthan), India

Received-13.08.2024, Revised-11.09.2024, Accepted-24.09.2024

Abstract: Cotton (Gossypium hirsutum L.) is one of the world’s most important fiber crops with a significant economic and social impact. It is the world’s oldest commercial crop, which provides fiber for mankind’s garments. It is also known as “The king of fibers” or “The white gold”. Cotton is primarily a raw material for a thriving textile industry and is also one of the most ancient and essential commercial crops, next to food grains. Among which, the Corynespora leaf spot of cotton caused by Corynespora cassiicola is observed in moderate form causing considerable damage in recent times but the disease has the potential to be severe and it could become significant concern for the cotton growers. Here in this experiment, the test fungus C. cassiicola could grow, sporulate and showed same colour of mycelium and different colour of substrate in wide range of pH from 4.0 to 10.0. The colony diameter was significantly higher in pH 7.0 followed by pH 8.0, pH 5.0, pH 6.0, pH 9.0 and pH 10.0. The poor growth was recorded at pH 4.The sporulation of C. cassiicola was found abundant at pH 7.0 and pH 8.0. It was moderate at pH 5.0, pH 6.0, pH 9.0 and pH 10.0 while, it was found scanty at pH 4.0. The colour of mycelium and substrate was observed grayish white and greenish, respectively.

Keywords: Cotton, Gossypium spp, Treatment, Disease, pH, Sporulation

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