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Effectiveness of Bacillus subtilis (Ehrenberg) Cohn. to Suppress the Intensity of Dry Spot Disease (Alternaria solani sor.) on Potato Plant (Solanum tuberosum L.) Irmawatie, Lilis; Nasrullah, Rizki; Suswana, Suli; Nurdin, Rosyad; Adviany, Ida
Applied Research in Science and Technology Vol. 5 No. 1 (2025): Applied Research in Science and Technology
Publisher : Research and Social Study Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33292/areste.v5i1.83

Background: Potato (Solanum tuberosum L.) is one of the priority horticultural crops to be developed in Indonesia. One of the factors affecting the decline in potato productivity is Plant Disturbing Organisms (PDO), namely Alternaria solani Sor. a pathogenic fungus that causes dry spot disease in potato plants. Infection by this disease can reach 100%, resulting in yield losses of up to 78%. One of the biological agents utilized is Bacillus subtilis (Ehrenberg) Cohn. the bacteria for controlling Alternaria solani Sor.Aims: This study aims to determine the effectiveness and optimal concentration of Bacillus subtilis (Ehrenberg) Cohn in suppressing the intensity of Alternaria solani Sor—disease on potato plants.Methods: The research was conducted using the Randomized Block Design (RBD) method, consisting of 6 treatments and 5 replications. The treatment applications used were: Bs-8 (Bacillus subtilis (Ehrenberg) Cohn. 8 ml/liter of water), Bs-10 (Bacillus subtilis (Ehrenberg) Cohn. 10 ml/liter of water), Bs-12 (Bacillus subtilis (Ehrenberg) Cohn. 12 ml/liter of water), Bs-14 (Bacillus subtilis (Ehrenberg) Cohn. 14 ml/liter of water), B1 (Positive control 80% mankozeb concentration 2 grams/liter of water), and B0 (Negative control without Bacillus subtilis (Ehrenberg) Cohn.).Result: The results showed that Bacillus subtilis (Ehrenberg) Cohn. treatment suppressed the intensity of dry spot disease (Alternaria solani Sor.), and the concentration of Bacillus subtilis (Ehrenberg) Cohn. 14 ml/liter effectively suppresses the intensity of Alternaria solani Sor. disease by 88.89% in potato plants.

Antagonism Trichoderma harzianum Rifai in Suppresing the Intensity of Antraknosa (Colletotrichum capcisi Sydow.) Disease Muliani, Yenny; Irmawatie, Lilis; Sukma, Siti Mariyam; Srimurni, Rafika Ratik; Adviany, Ida; Ustari, Debby; Milani, Mia Nurul
Al-Hayat: Journal of Biology and Applied Biology Vol. 5 No. 1 (2022)
Publisher : Fakultas Sains dan Teknologi, UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/ah.v5i1.13546

Cayenne pepper (Capsicum frutescens L.) is a horticultural plant that has high economic value and contains nutrients that the body needs. Cayenne pepper is one of the leading national horticultural commodities, so it is necessary to increase the production of cayenne pepper appropriately. The obstacle that is often faced in the production of cayenne pepper is the disruption of the production of cayenne pepper caused by the attack of anthracnose disease. Anthracnose disease or fruit rot caused by the fungus Colletotrichum capcisi Sydow can result in yield losses ranging from 20-90%. Trichoderma harzianum Rifai. is a soil saprophytic fungus that naturally can be used as a biological agent, because it has antagonism against pathogens in the form of competition for space and nutrients, mycoparasites and antibiosis. The experimental results in the laboratory showed that the biological agent Trichoderma harzianum Rifai was able to suppress the development of anthracnose disease.

Antagonism Trichoderma harzianum Rifai in Suppresing the Intensity of Antraknosa (Colletotrichum capcisi Sydow.) Disease Muliani, Yenny; Irmawatie, Lilis; Sukma, Siti Mariyam; Srimurni, Rafika Ratik; Adviany, Ida; Ustari, Debby; Milani, Mia Nurul
Al-Hayat: Journal of Biology and Applied Biology Vol. 5 No. 1 (2022)
Publisher : Fakultas Sains dan Teknologi, UIN Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/ah.v5i1.13546

Cayenne pepper (Capsicum frutescens L.) is a horticultural plant that has high economic value and contains nutrients that the body needs. Cayenne pepper is one of the leading national horticultural commodities, so it is necessary to increase the production of cayenne pepper appropriately. The obstacle that is often faced in the production of cayenne pepper is the disruption of the production of cayenne pepper caused by the attack of anthracnose disease. Anthracnose disease or fruit rot caused by the fungus Colletotrichum capcisi Sydow can result in yield losses ranging from 20-90%. Trichoderma harzianum Rifai. is a soil saprophytic fungus that naturally can be used as a biological agent, because it has antagonism against pathogens in the form of competition for space and nutrients, mycoparasites and antibiosis. The experimental results in the laboratory showed that the biological agent Trichoderma harzianum Rifai was able to suppress the development of anthracnose disease.

The POTENTIAL OF Syzigium aromaticum L. TO CONTROL LEAF SPOT DISEASE (Cercospora capsici) IN CAYENNE PEPPER (Capsicum frutescens L.) Muliani, Yenny; Susanto, Dwi; Adviany, Ida; Nursinta, Neng Tita; Ustari, Debby
BIOTROPIA Vol. 32 No. 2 (2025): BIOTROPIA Vol. 32 No. 2 August 2025
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2025.32.2.2299

Article Highlights: - In preliminary lab tests, clove leaf extract clearly slowed C. capsici growth.- Field trials assessed its potential to reduce leaf spot disease in cayenne pepper.- Applying concentrations above 15 g/L tended to lower the observed disease intensity.- The same concentration range was also linked to an increase in leaf number.- However, low field disease incidence limited detectable yield responses.Abstract:Cayenne pepper (Capsicum frutescens L.) is a spice plant that has good prospects for development in Indonesia because of its high market demand. There are several problems in increasing the production of this crop, one of which the plant diseases. One of the main diseases in cayenne pepper is leaf spot disease caused by the fungus Cercospora capsici (Heald & F.A. Wolf). Chemical pesticides can effectively control the disease but they have negative effects on the environments. Clove tree (Syzigium aromaticum L.) is usually cultivated for its dried clove buds that can be used for many other purposes. Besides, because of their contents, the leaves of clove tree have a potential to reduce the intensity of leaf spot disease. Therefore, the aims of the study were (1) to determine the effects of clove leaf extract on reducing the intensity of Cercospora capsici (Heald & F.A. Wolf) in cayenne pepper, and (2) to determine the effective concentration of the extract in reducing the intensity of the disease. The experiment used a randomized block design (RBD) with 5 treatments and 5 replications, namely: A = control (water only), B = 10 g clove leaf extract/L water, C = 15 g clove leaf extract/L water, D = 20 g clove leaf extract/L water, and E = 25 g clove leaf extract/L water. The results showed that the applications of leaf extract of Syzigium aromaticum L. could reduce the intensity of the leaf spot disease caused by Cercospora capsici, but the applications had no effect on the yield of the cayenne pepper. The ineffectiveness of treatments on the yield was deduced due to the lowness of the intensities of the disease in all treatments including the control.

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