http://localhost:8080/handle/123456789/3718 2026-04-18T14:32:09Z http://localhost:8080/handle/123456789/4871 EVALUATION OF BETEL VINE CULTIVARS AGAINST SCLEROTIUM ROLFSII CAUSING FOOT AND ROOT ROT DISEASE TASNIM, SAMIA A study was conducted at the Central Farm and at the Plant Pathology Laboratory of Sher-e-Bangla Agricultural University, Dhaka-1207 from July/2021 to June/2022 to isolate, identify and conduct pathogenicity test of the isolated organism and to screen out resistant cultivar(s) of betel vine against Sclerotium rolfsii causing foot and root rot disease. The causal organism of foot and root rot disease was isolated from infected root samples and identified as Sclerotium rolfsii. It was mass multiplied in barley grains and its pathogenicity was confirmed by Koch’s Postulates. Nine different cultivars of betel vine viz. ChL-01 (Chuadanga Local), MoL-02 (Moheskhali Local), KiL-03 (Kishoreganj Local), SaL-04 (Satkhira Local), CuL-05 (Cumilla Local), RaL-06 (Rajshahi Local), BP07 (BARI Pan-1), BP-08 (BARI Pan-2) and BP-09 (BARI Pan-3) were evaluated against Sclerotium rolfsii by screening experiment. The results were compiled based on physio-morphological features, days required for the visual expression of mycelial growth on soil surface, days required for the appearance of 1 disease symptom, disease reactions, yield and yield contributing characters. The vegetative growth parameters and morphological features of different cultivars of betel vine varied significantly to some extent. After inoculation, the days required for the appearance of mycelial growth on soil varied noticeably. The lowest 3 days were required for Satkhira Local, BARI Pan-2 and BARI Pan-3 and the highest 10 days were required for Rajshahi Local. No mycelial growth was seen on soil in Kishoreganj Local. The appearance of 1 st disease symptoms among the betel vine cultivars differed significantly. The highest incubation period (18 days) was found in Rajshahi Local and the lowest (4 days) was found in BARI Pan-2 and BARI Pan-3. No disease symptom was noticed in Kishoreganj Local. The disease incidence ranged from 0%-100%. Among the betel vine cultivars, Kishoreganj Local showed resistant reactions while three cultivars viz. Chuadanga Local, Rajshahi Local and BARI Pan-1 showed moderately resistant reactions. Other three cultivars viz. Moheskhali Local, Satkhira Local and Cumilla Local showed moderately susceptible reactions and the rest two cultivars viz. BARI Pan-2 and BARI Pan-3 showed highly susceptible reactions against Sclerotium rolfsii causing foot and root rot disease of betel vine. CFU/gram soil was observed the highest (3.04x10 6 ) in BARI Pan-3 and the lowest (0.06x10 6 st ) in Kishoreganj Local. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN PLANT PATHOLOGY SEMESTER: July-December, 2021 2021-12-01T00:00:00Z http://localhost:8080/handle/123456789/4828 Evaluation of Different Planting Methods against Major Diseases of Selected Boro Rice Varieties MOIN UDDIN, ABU JAFOR MOHAMMAD The System of Rice Intensification (SRI), an innovation that was first emerged in Madagascar in the 1980s and has now diffused to more than 50 countries. The present study was conducted as field experiment in the central farm of Sher-e-e Bangla Agricultural University (SAU) using RCBD design and the lab experiment was carried out in Molecular Biology and Plant Virology Laboratory under the Department of Plant Pathology, Sher-e-Bangla Agricultural University, Dhaka- 1207. The experiment was carried out to adopt SRI as an alternative approach for management of major rice diseases in Bangladesh, during the period of November, 2020 to June, 2021. From the study it was revealed that all the selected planting methods gave the significantly effect on percent disease incidence (% DI) and severity (% DS) of major rice diseases viz. blast, brown spot, sheath blight and bacterial leaf blight in selected boro rice varieties (BRRI dhan 28, BRRI dhan 89, BRRI dhan 92 and purple rice). The highest disease incidence and severity was recorded in conventional planting method and the lowest in basic SRI method. The moderate disease incidence and severity was recorded in modern SRI method which was statistically non-significant with Basic SRI method but significant with conventional method. However, it is necessary for further trial in different variety and AEZs as field experiment. So, it may be recommended that the System of Rice Intensification (SRI) may be alternative for management of major rice diseases. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN PLANT PATHOLOGY 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4827 VALUE CHAIN ANALYSIS AND POST HARVEST DISEASES OF DIFFERENT CITRUS FRUITS RAHMAN, MD. TOWFIQUR A survey study was conducted to analyze citrus value chain and identify different citrus diseases at farm level and trader level. The survey was conducted during the periods of August 2020 to February 2021 in the Sylhet and Dhaka district of Bangladesh. Three upazillas namely Jaintapur, Khadimnagar and Sylhet Sadar were selected for collection of information on farm practices and disease faced by those area’s growers. Sylhet Kodomtoli wholesale market, Mohammadpur Krishi market, Karwan bazar and Retailer shops (Taltola, Mirpur 1, farmgate) at Dhaka city were studied for value chain at marketing. The survey revealed that citrus growing areas were increased. Most of the farmers were medium sized (46.66%) and farmers have 5-15 years’ experience in citrus cultivation. The common varieties grown in that selected areas were Elachi lemon, Zara lemon, BARI malta and Orange (BARI Komla). For transportation harvested citrus fruits, Beparies mostly used mini trucks. Traders(retailer) used van (60%) and local carts (15%) for transporting their citrus in the marketing channel. Disease incidence varied from variety to variety and upazilla to upazilla. Highest canker incidence (52%) was found in khadimnagar in Elachi lemon and highest Citrus scab incidence (31%) was found at Jaintapur in BARI malta. At post-harvest stage, highest citrus blue mold incidence (12.3%) was found in retailer shops at Dhaka city and citrus green mold incidence (16.6%) was also found in retailer shops at Dhaka city. Citrus blue mold incidence (3%) was found lowest in kodomtoli wholesale market, Sylhet district and citrus green mold disease incidence (4.1%) was found lowest at karwan bazar market, Dhaka. In our study revealed that highest marketing margin gained by retailer level for BARI malta (1254.21tk/quintal) A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN PLANT PATHOLOGY 2021-01-01T00:00:00Z http://localhost:8080/handle/123456789/4826 FIELD RESPONSE OF KOHLRABI VARIETIES AGAINST MAJOR FUNGAL AND VIRAL DISEASES KHAN, TASMERY A field experiment was conducted at central farm and plant pathology lab, Shere-Bangla Agricultural University, Dhaka-1207 from November 2020 to March 2022 to study the field response of selected kohlrabi varieties against major fungal and viral diseases and identification, isolation of causal organisms of fungal diseases. Five varieties were selected for this experiment viz- Challenger, Goliath, Bankim, OP Hybrid and Early star, which was collected from Siddik bazar, Dhaka. The field experiment was carried out in RCBD (Randomized Complete Block Design) with four replications of each variety in Robi season. During field response, three diseases were observed at field condition, where two fungal and one viral disease identified compared with international literature. They were- Wilt (caused by Fusarium oxysporum), Alternaria leaf spot (caused by Alternaria brassicae) and Mosaic disease (caused by Turnip Mosaic Virus). Wilt was observed at seedling condition where variety Bankim was the most susceptible (1.25%) and lowest incidence was recorded at OP and Early star variety (0.25%). In case of Alternaria leaf spot, among five varieties Challenger showed maximum infection (87.47%) and minimum was seen in Bankim variety (64.45%). In case of growth and yield character significant variation among all varieties were found. Maximum yield was observed in variety Bankim (9.80 t/ha) and minimum yield was recorded in variety Challenger (7.46 t/ha). Respectively, Yield loss was maximum in variety challenger (45%) and minimum in Bankim (20%). In case of viral disease, TuMV had the most impact on variety challenger (8.32%) and it greatly reduced its average fruit weight resulted as 45.12 gm and lowest disease incidence was observed in variety Bankim (1.09%) and their average fruit weight leads to 119.67 gm. Considering field response against all diseases among all varieties, variety Bankim has minimum percentage of incidence against all diseases as well as it gave highest yield in both fungal and viral infections. So Bankim reflects resistance against all disease response compared to other selected varieties. A Thesis Submitted to the Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN PLANT PATHOLOGY 2021-01-01T00:00:00Z