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Use of non-chemical methods for the management of southern blight disease of carrot incited by Sclerotium rolfsii Rubayet, M. Tanbir; Prodhan, Farhana; Hossain, M. Shamim; Ahmed, Minhaz; Mamun, M. Abdullah Al; Bhuiyan, M. Khurshed Alam
Journal of Agriculture and Applied Biology Vol 1 No 2 (2020): Journal of Agriculture and Applied Biology
Publisher : Future Science

This experiment was conducted to assess the effect of Trichoderma harzianum, soil solarization, and biofumigant on southern blight dis-ease of carrot incited by Sclerotium rolfsii isolate CS 5. A series of in-vitro and in-vivo trials laid out to select a virulent isolate of S. rolfsii against the carrot variety New Kuroda and evaluated the mustard, cabbage, cauliflower, and broccoli leaf extracts for choosing an effec-tive biofumigant against test pathogen. Mustard was the most effec-tive in inhibiting the radial growth, and sclerotia formation (80.37 and 83.37%) of S. rolfsii (isolate CS 5) at 40% level of concentration followed by cabbage leaf extract (62.22 and 68.69%). On the contrary, a total of 10 isolates of T. harzianum were screened against the test pathogen on Potato Dextrose Agar (PDA) medium for choosing a dominant isolate of T. harzianum. The isolate Th-6 was found as the most active in inhibiting the radial growth (84.44%) of S. rolfsii fol-lowed by Th-1 (75.56%). In the application of T. harzianum, biofumi-gation, and soil solarization, the treatment appeared to be the most superior in reducing pre- and post-emergence mortality of carrot during secondary field trials. The lowest southern blight disease inci-dence (10.77%), and disease severity (12.78%) were found at the same treatment. Subsequently, the yield of carrot was increased 155.18% which might be due to the reduction of carrot disease as well as the addition of organic materials in the soil.

Use of non-chemical methods for the management of southern blight disease of carrot incited by Sclerotium rolfsii Rubayet, M. Tanbir; Prodhan, Farhana; Hossain, M. Shamim; Ahmed, Minhaz; Mamun, M. Abdullah Al; Bhuiyan, M. Khurshed Alam
Journal of Agriculture and Applied Biology Vol 1 No 2 (2020): Journal of Agriculture and Applied Biology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/jaab.01.02.05

This experiment was conducted to assess the effect of Trichoderma harzianum, soil solarization, and biofumigant on southern blight dis-ease of carrot incited by Sclerotium rolfsii isolate CS 5. A series of in-vitro and in-vivo trials laid out to select a virulent isolate of S. rolfsii against the carrot variety New Kuroda and evaluated the mustard, cabbage, cauliflower, and broccoli leaf extracts for choosing an effec-tive biofumigant against test pathogen. Mustard was the most effec-tive in inhibiting the radial growth, and sclerotia formation (80.37 and 83.37%) of S. rolfsii (isolate CS 5) at 40% level of concentration followed by cabbage leaf extract (62.22 and 68.69%). On the contrary, a total of 10 isolates of T. harzianum were screened against the test pathogen on Potato Dextrose Agar (PDA) medium for choosing a dominant isolate of T. harzianum. The isolate Th-6 was found as the most active in inhibiting the radial growth (84.44%) of S. rolfsii fol-lowed by Th-1 (75.56%). In the application of T. harzianum, biofumi-gation, and soil solarization, the treatment appeared to be the most superior in reducing pre- and post-emergence mortality of carrot during secondary field trials. The lowest southern blight disease inci-dence (10.77%), and disease severity (12.78%) were found at the same treatment. Subsequently, the yield of carrot was increased 155.18% which might be due to the reduction of carrot disease as well as the addition of organic materials in the soil.

Effect of Elevated Temperature and CO2 Concentration on Disease Incidence, Severity and Yield of Wheat, Cabbage and Tomato Rubayet, Md. Tanbir; Briste, Preangka Saha; Mamun, Md. Abdullah Al; Prodhan, Farhana; Kader, Md. Abdul; Jannat, Rayhanur; Hossain, Md. Motaher; Rahman, Md. Mizanur; Biswas, Jatish Chandra
Journal of Agriculture and Applied Biology Vol. 7 No. 1 (2026): Journal of Agriculture and Applied Biology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/

This study investigated the effects of elevated temperature and carbon dioxide (CO₂) on disease incidence, severity, and yield impacts in wheat (Triticum aestivum), cabbage (Brassica oleracea), and tomato (Solanum lycopersicum) under open-field and nethouse conditions. The pathogens evaluated included Rhizoctonia solani, Sclerotium rolfsii, Bipolaris sorokiniana, Alternaria brassicae, and Fusarium oxysporum f. sp. lycopersici. During the experimental period, maximum and minimum temperatures reached 39.3 °C and 11 °C in nethouse conditions compared with 37.5 °C and 9 °C in the open field, while CO₂ concentration was 388–395 ppm in the nethouse and 385 ppm in ambient air. Elevated CO₂ and temperature consistently increased disease incidence and severity. In wheat, sclerotium wilt showed the highest incidence (55.6%); in cabbage, both sclerotium wilt and Alternaria blight reached 100%; and in tomato, sclerotium wilt also caused 100% incidence. These infections were associated with significant yield reductions across all crops. To our knowledge, this is the first report from Bangladesh quantifying crop disease yield interactions under elevated temperature and CO₂, underscoring the vulnerability of key crops to climate change and the urgent need for adaptive management strategies.

Effect of Elevated Temperature and CO2 Concentration on Disease Incidence, Severity and Yield of Wheat, Cabbage and Tomato Rubayet, Md. Tanbir; Briste, Preangka Saha; Mamun, Md. Abdullah Al; Prodhan, Farhana; Kader, Md. Abdul; Jannat, Rayhanur; Hossain, Md. Motaher; Rahman, Md. Mizanur; Biswas, Jatish Chandra
Journal of Agriculture and Applied Biology Vol. 7 No. 1 (2026): Journal of Agriculture and Applied Biology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/

This study investigated the effects of elevated temperature and carbon dioxide (CO₂) on disease incidence, severity, and yield impacts in wheat (Triticum aestivum), cabbage (Brassica oleracea), and tomato (Solanum lycopersicum) under open-field and nethouse conditions. The pathogens evaluated included Rhizoctonia solani, Sclerotium rolfsii, Bipolaris sorokiniana, Alternaria brassicae, and Fusarium oxysporum f. sp. lycopersici. During the experimental period, maximum and minimum temperatures reached 39.3 °C and 11 °C in nethouse conditions compared with 37.5 °C and 9 °C in the open field, while CO₂ concentration was 388–395 ppm in the nethouse and 385 ppm in ambient air. Elevated CO₂ and temperature consistently increased disease incidence and severity. In wheat, sclerotium wilt showed the highest incidence (55.6%); in cabbage, both sclerotium wilt and Alternaria blight reached 100%; and in tomato, sclerotium wilt also caused 100% incidence. These infections were associated with significant yield reductions across all crops. To our knowledge, this is the first report from Bangladesh quantifying crop disease yield interactions under elevated temperature and CO₂, underscoring the vulnerability of key crops to climate change and the urgent need for adaptive management strategies.

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