http://localhost:8080/handle/123456789/2719 Sat, 18 Apr 2026 14:23:13 GMT 2026-04-18T14:23:13Z http://localhost:8080/handle/123456789/4309 EFFICACY OF TRICHODERMA AND BOTANICALS IN CONTROLLING ALTERNARIA LEAF BLIGHT OF MUSTARD AND STUDY ON MORPHOLOGY OF THE PATHOGEN SIDDIQUE, ABU BAKAR Experiments were conducted at the Farm of Bangladesh Agricultural Research Institute (SARI), Joydevpur, Gazipur and in the laboratory of Plant Pathology division, during rabi season from the month of November' 2009 February'20IO to evaluate the efficacy of some selected Trichoderma harzianum strains and plant extracts against Alternaria brassicae and Alternaria brassicicola causing gray blight of mustard (Brassica campestris var. BARI Sarisha-I5). Three Trichoderma harzianum strains and three plant extracts viz. Bashok (Adhatoda vasica) leaf extract, Bishkatali leaf extract and Marigold (Tagetes patula) were explored in the experiment. Among the Trichoderma harzianum strains and plant extracts, Trichoderma harzianum SI showed the best performance in reducing disease incidence an~ disease severity as well as increasing seed yield against leaf blight of mustard. Seed infection by Alternaria spp. was reduced by 64.79% and seed yield was increased by 48.19% over control by the application of Trichoderma harzianum S1. Among the botanicals, Marigold showed the better performance. No promising results were shown by the rest of the treatments against leaf blight of mustard. A Thesis Submitted to the Faculty of Agriculture Sher-e-Bangia Agricultural University, Dhaka In partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN . PLANT PATHOLOGY Thu, 01 Jan 2009 00:00:00 GMT http://localhost:8080/handle/123456789/4309 2009-01-01T00:00:00Z http://localhost:8080/handle/123456789/4306 EFFICACY OF SOME BOTANICALS AND FUNGICIDES IN CONTROLLING LEAF BLIGHT OF MUSTARD MD. MOZAID The efficacy of some selected fungicides and botanicals were evaluated against Alternaria brassicae and Alternaria brassicicola causing leaf blight of mustard (var. BARl sharisha-15). Experiments were conducted at the farm of Bangladesh Agricultural Reasearch Institute, Gajipur, Joydebpur during rabi season from the month of October 2009 to March 2010. Three fungicides viz. Alphadeone, Aristodeone, Movral and three botanical extracts viz. Garlic clove extract, Tulshi and Dhutora leaf extract were employed in the experiment. Among the fungicides and botanicals tested, movral showed the best performance in reducing disease severity as well as increasing seed yield against gray blight of mustard. Leaf infection by Alternaria sp was reduced by 51.17 .%and seed yield was increased by 20.64 % over control by the application of Movral. No promising results were shown by the botanicals against leaf blight of mustard. 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 (MS) IN PLANT PATHOLOGY Thu, 01 Jan 2009 00:00:00 GMT http://localhost:8080/handle/123456789/4306 2009-01-01T00:00:00Z http://localhost:8080/handle/123456789/4289 SEED HEALTH AND QUALITY STATUS OF MUSTARD SEED GHOSH, PALASH uality and health status of nine improved varieties of breeder seed and farmer seed of mustard variety Tori-7 grown in 2007-2008 was determined by seed health and quality analysis in the Seed Health Laboratory, Department of Plant Pathology, SAU, Dhaka. Respectively, 14 seed samples of breeder tier and 40 from farmers representing four districts of Bangladesh were included in the present study. Quality analysis showed that the average moisture content of breeder seed was 6.9%. and 5.6% collected from BARI, Gazipur and RARS, Ishurdi, respectively; whereas in fanner seed, the average moisture content was 8.0010.Three types of seed contaminants viz. inert matter, other crop seed and varietal mixture were recorded in fanner seed; while in breeder seed only inert matter was observed. Five types of abnormal seeds viz. discolored seed, shriveled seed, spotted seed, undersized seed and broken seed were encountered in farmer seed; whereas four types of abnormal seed except broken seed were found in breeder seed. The amount of abnormal seed and seed contaminants were higher in farmer seed than breeder seed. In an average, 93 and 60% 'best' or 'clean' seed were recovered from breeder and fanner seed, respectively by removing the seed contaminants and abnormal seed through manual seed cleaning. Occurrence of seed contaminants and abnormal seed was always higher in farmer seed compared to breeder seed. Seed health analysis revealed that 11 fungi were associated with mustard seeds. Of those, five fungi viz. Alternaria brassicae, A. brassicicola, Fusarium solani, Aspergillus flavus and Penicillium sp. were predominant, constituting 87.5% of the total seed-borne fungal infections. The fungi varied in prevalence with respect to seed tier, variety and sources of seed collection. Prevalence of • the total as well as the individual predominant fungi were found always higher in unclean seed in comparison to clean seed at all the locations. Occurrence of the predominant fungi was higher in farmer seed compare to breeder seed. •Clean , seed significantly gave higher percentage of normal seedlings and lesser number of abnormal seedlings and dead seeds over unclean seed both in breeder and fanner seed. Health and quality of fanner seed of mustard can be improved through manual seed cleaning. 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 (MS) IN PLANT PATHOLOGY Thu, 01 Jan 2009 00:00:00 GMT http://localhost:8080/handle/123456789/4289 2009-01-01T00:00:00Z http://localhost:8080/handle/123456789/4288 EPIDEMIOLOGICAL SURVEY ON THE INCIDENCE AND SEVERITY OF PURPLE BLOTCH OF ONION IN BANGLADESH FAYSAL, KHAN MD. NURUDDIN An epidemiological survey on the incidence and severity of purple blotch of onion was conducted during ·onion growing seasons of the year 2007-08, 2008-09 and 2009-10 (Winter- September to March) in the major onion growing areas viz. Vasanchar (Faridpur), Jitka (Manikgonj), Sayedpur (Comilla), Nandina (Jamalpur), Kesobpur (Jessore), BARI (Gazipur), SAU campus (Dhaka), Hathazari (Chittagong), Dhamrai (Dhaka), Taherpur (Rajsbahi) of the country, Data were collected on % Plant infection, % Leaf infection, % LAD ( Leaf Area Diseased ), % SAD (Stalk Area Diseased), Soil pH, Soil temperature, Soil moisture, Air temperature and Air humidity (% RH). The disease incidence and severity of purple blotch of onion varied with locations, and environmental factors. The plant infection and leaf infection ranged from 87 % - 36 % and 62 % - 20 %, respectively while the percent leaf area diseased (% LAD) and percent stalk area diseased (% SAD) ranged from 36.67 % - '9.00 % and 39.00 % - 11.00 %, respectively. The highest disease incidence and severity during the consecutive 3 growing seasons of the year 2007-08,2008-09 and 2009-10 was recorded at Sayedpur (Comilla) where average air temperature, air humidity and pH were 24.08oC, 75.17% and 4.72 respectively. The lowest incidence and severity was recorded at BARI (Gazipur) where average air temperature, air humidity and pH were 23.990C, 85.44% and 5.30 respectively. Soil pH (4.6 -5.17), air temperature (23°C) and air humidity (75 % ± 2) had influential effect on the incidence;3l1d severity of purple blotch of onion. 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 (MS) IN PLANT PATHOLOGY Thu, 01 Jan 2009 00:00:00 GMT http://localhost:8080/handle/123456789/4288 2009-01-01T00:00:00Z