Universal Journal of Plant Science 4(4): 43-49, 2016 http://www.hrpub.org DOI: 10.13189/ujps.2016.040401 Management of Cercospora Leaf Spot of Indian Spinach (Basella alba L.) with BAU Bio-fungicide and a Plant Growth Promoting Hormone Md. Mohidul Hasan1,*, Nazia Binta Islam1, Shamima Naznin1, Md. Mobinul Islam1, 2 Kishowar-E-Mustarin 1Department of Plant Pathology, Hajee Mohammad Danesh Science and Technology University, Bangladesh 2Wheat Research Centre, Bangladesh Agricultural Research Institute Joydebpur, Bangladesh Copyright©2016 by authors, all rights reserved. Authors agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License Abstract Trichoderma based BAU-biofungicide, Basellaceae is an indigenous, rapidly growing, tropical leafy chemical Carbendazim and a synthetic plant growth vegetable [1,2] commonly grown as backyard plant in the promoting (PGP) hormone have been used to study their home gardens. It is originated from India or Indonesia [3], effect on Cercospora leaf spot of Indian spinach. Number of however; it is also popular in tropical and subtropical region leaf, number of infected leaf, disease incidence, disease including Asia, America, Africa, Madagascar etc. [2]. The severity, area under disease progress curve (AUDPC), plant vegetable has other interesting common names in different height and plant weight were measured and significant region like Ceylon spinach, Malabar spinach, saan choy variations was found against different treatment (Chinese), mongtoi (Vietnamese), alugbati (Philippines), combinations. Among the treatment combinations, seed puisaag (Bengali), remayong (Malay) etc. Nutritionally, it is treating with Carbendazim followed by foliar spray with low content of carbohydrate and fat but holds good amount Carbendazim, seed coating with BAU bio-fungicide of vitamins (Vitamin-A -3250IU/100g), minerals Iron 1.4%, followed by foliar spray with Carbendazim, only foliar spray Calcium 0.15%, and Antioxidants (ß-carotene, lutein, with Carbendazim and only spray of PGP hormone zea-xanthin) [1]. significantly reduced disease incidence and severity with Leaves are the prime edible parts of Indian spinach increasing of plant height and weight. Interestingly, foliar vegetable. Since, the yield or production data of this application of PGP hormone reduces disease incidence and vegetable is not available in Bangladesh; it is assumed that, a severity by 58.38% and 63.8% in both the variety of Indian vast amount of yield is lost in terms of quantity and quality spinach, respectively over control, whereas; in both the due to various constraints. Among the constraints, diseases variety disease incidence and severity is reduced by seed especially Cercospora leaf spot plays a vital role for the treatment with Carbendazim followed by foliar spray with qualitative loss of this vegetable. Cercospora leaf spot is Carbendazim 69.72% & 77.63%; seed treatment with BAU caused by Cercospora beticola which affect mainly on leaf. bio-fungicide followed by foliar spray with Carbendazim The typical symptoms appear as circular to oval shaped, 63.73% & 69.49%; foliar spray with Carbendazim 55.68% & purple color pinhead spots with a necrotic gray centre 58.19%, respectively. Foliar application of PGP hormone surrounded by a purple to brown border [4]. Due to along with the reducing of disease incidence and severity, Cercospora leaf spot disease, photosynthetic process is also increases the leaf number by 68.62%, plant height by disturbed and leaves becomes deformed resulting weakens 54.64% and plant weight by 65.69% over control. AUDPC plant, premature defoliation which ultimately lowers the showed that, local variety of Indian spinach is more yield and market value. susceptible to Cercospora leaf spot than BARI spinach 1. The causal agent Cercospora mainly is seed born, however; the pathogen is also able to survive for at least one Keywords Cercospora Leaf Spot, Indian Spinach, PGP year in plant debris and soil also. Primarily their spores are Hormone, BAU Bio-fungicide dispersed by wind and is favored by prolong rainfall, high relative humidity and 250C to 350C temperature [4]. The fungus Cercospora also causes numerous economically relevant plant diseases on other leafy vegetable like Palong 1. Introduction [5], egg- plant [6], legume crop like seasame, groundnut [7,8] and also in mungbean [9] where the yield loses were Indian spinach (Basella alba L.) belongs to the family recorded up to 58% [10]. 44 Management of Cercospora Leaf Spot of Indian Spinach (Basella alba L.) with BAU Bio-fungicide and a Plant Growth Promoting Hormone To reduce the market loss of the vegetable, peoples eight different treatment combination to manage the usually use chemical for management of the disease. Since it Cercospora leaf spot disease as following combinations: T0: is leafy vegetable, farmers also use some synthetic PGP control, T1: seed coating with BAU bio-fungicide followed hormone to improve its production. In our study test by foliar spray with suspension, T2: seed treating with chemicals chosen were Carbendazim and Foliar plus growth Carbendazim followed by foliar spray with Carbendazim, T3: hormone to show the treatment effect on various growth seed coating with BAU bio-fungicide followed by foliar parameter as well as Cercospora leaf spot disease of Indian spray with Carbendazim, T4: seed treating with Carbendazim, spinach. Carbendazim is widely known as Benzimidazole T5: seed coating with BAU bio-fungicide, T6: foliar spray compound owing to the excellent systemic control of much with Carbendazim and T7: foliar spray with PGP hormone. important plant diseases [11]. Other way “Foliar plus” is foliar liquid which basically contain auxin and gibberellic 2.3. Seed Coating and Application of BAU Bio-Fungicide acid (GA3) (200ppm), including some other macro and micro nutrients like nitrogen, muriate of potash, zinc, Seeds were coated with BAU bio-fungicide @ 1:40 w/w calcium, magnesium, iron, manganese etc. following the published method [15] by moistening the seed Plants by nature generate various types of hormones, with rice forth. The seeds were thoroughly mixed with the which include auxins, gibberellins (GA), abscisic acid BAU bio-fungicide by shaking the petridishes and then seeds (ABA), cytokinins (CK), salicylic acid (SA), ethylene (ET), were placed in a cool and dry place for drying until sowing in jasmonates (JA), brassinosteroids (BR) and peptide the field. Spray suspension of the bio-fungicide were made hormones, play vital roles not only in growth and by scrapping the spores from cultured Trichoderma pure developmental processes but also in biotic and abiotic stress culture and diluted in sterile distilled water. The numbers of responses in plants [12]. Phytohormone also changes its spores were counted by using a haemacytomer and finally level of secretion during pathogenic attack of plant [13,14]. 107spores/ml was used to spray. The spore suspension was As chemicals have undescribed contribution on sprayed three times at 15, 30 and 45 days after sowing. agriculture to control diseases and yield improvement but indiscriminate and frequent use of this chemical ultimately 2.4. Seed Treatment with Carbendazim and Foliar Spray creates serious health hazards by entering in food web. So, of Chemicals now days, plant pathologist give an attention on sustainable and eco-friendly agricultural practices for the management Seeds were treated with Carbendazim by using sterilized of plant diseases. In Bangladesh few approaches have been petridishes where a little sterilized distilled water was used to taken to evaluate efficacy of Trichoderma based moisten the chemical. Foliar spray solution of the fungicide bio-fungicide and PGP hormone against plant disease was prepared by dissolving the required amount in water to development. In the light of above background, present make the final concentration of 0.1%. Plant growth investigate has been taken so far for the first time in order to promoting hormone solution was also prepared by dissolving evaluate a Trichoderma based BAU bio-fungicide and plant 10 ml/10 L water. Both the solutions were sprayed three growth promoting (PGP) hormone against Cercospora leaf times at 15, 30 and 45 days after sowing. spot (CLS) disease of Indian spinach. 2.5. Scoring of Disease The data on number of leaf, number of infected leaf, 2. Materials and Methods number of spot on leaf were recorded up to harvest by visual observation at 21, 27, 33, 39, 45 and 51 days after sowing. 2.1. Experimental Site and Design Disease incidence and severity was measured into five categories following a disease grading scale where 0= No Seeds of two variety of Indian spinach BARI spinach 1 visible symptom; 1= 1 to 10% leaf area affected; 2=11 to 20% and local variety were collected from Bangladesh leaf area affected; 3= 21 to 50% leaf area affected; 4= 51 to Agricultural Research Institute and local market, 80% leaf area affected and 5= >80% leaf area affected [16]. respectively. The collected seeds were sown at experimental The disease intensity accomplished with percent disease field of Hajee Mohammad Danesh Science and Technology index was calculated by using following formula [17]. University, Dinajpur during the period from May to July / 2008. Seeds were sown on 27 may 2008 and plants were Disease Incidence(%) = ×100 / harvested on 28 July 2008. The experiment was laid out in Total number of leaf plant randomized complete block design with three replications. Number of infected leaf plant Disease Severity (%)= × × 100 2.2. Experimental Materials and Treatments Total number of rating maximum We have also measured area underdisease diseasegrade progress curve Trichoderma based BAU bio-fungicide, chemical from PSI and calculated according with the following Carbendazim and a PGP hormone (Foliar Plus) were used by formula [18]. Universal Journal of Plant Science 4(4): 43-49, 2016 45 AUDPC= 0.5[( + )(ti + 1 ti)) of observation was also found with seed treatment with −1 Carbendazim (4.00 to 10.33) and seed treatment with th Where, n =total� number=1 assessment +1 time, t =− time of i BAU-bio-fungicide (3.33 to 10.33).