An experiment was conducted to find out variation in isolated Rhizoctonia solani based on radial mycelial growth and sclerotial production. Five isolates of Rhizoctonia solani representing five clusters group were selected and were grown at different levels of temperature and pH on potato dextrose agar (PDA). It was observed that optimum temperature and pH for growth and scierotial production varied among the isolates. The rates of growth and sclerotial formation were not uniform at the same levels of the two growth factors. The maximum mycelial growth of all isolates was found at 30°C. At 35°C, only GAZ-9 and GAZ-18 showed initiation of growth, but the rate was very slow. The optimum temperature for sclerotial production of the isolates GAZ-9, JES-16, GAZ-18 SYL-26 was 30°C and for the isolate DIN-8 was 25°C. The optimum pH for maximum radial growth was 6 for DIN-8 and 7 for other four isolates. The maximum number of sclerotia was produced by DIN-8, GAZ-9, and SYL-30 at pH 8, 4, and 7, respectively. The optimum pH for sclerotia formation in JES-16 and GAZ-18 was pH 6.

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A field experiment on brinjal (Solanum melongena cv of brinjal) was conducted at the research field of Regional Horticulture Research Station, Shibpur, Narsingdi during the rabi season of 2016-2017 to find out the suitable application frequency of Napthalene acetic acid (NAA) for higher and profitable yield of brinjal. Napthalene acetic acid (NAA) 40 ppm were sprayed at the different days interval after transplanting (DAT) and flowering initial stage (FIS) of brinjal. Distilled water spray (control) (T0) and five treatments of NAA applications were spraying at 15 DAT (T1), spraying at 15 DAT and at 1st FIS (T2), spraying at 15 DAT then thrice spray at 15 days interval starting from 1st FIS (T3), one spray before 7 days of first flower initiation and thrice spray at 7 days interval starting from1st flower initiation stage (T4) and one spray before 15 days of first flower initiation and thrice spray at 15 days interval starting from 1st flower initiation stage (T5). The NAA application frequencies had no significant effect on plant height, number of leaves/plant, leaf area/plant and specific leaf weight. The T2 and T4 treatments showed identical performances in respect of all parameters and T2 treatment gave maximum total dry matter/plant, long and medium styled flower percent, fruit set percent, number of fruits/plan and fruit yield per hectare.Res. Agric., Livest. Fish.5(2): 151-155, August 2018

A field experiment was conducted to investigate the effect of some management practices to minimise jute yellow mosaic virus disease. The management practices were employed at natural condition and placed randomly with four replications. The treatments were spraying malathion 57 EC, rouging and field sanitation, top dressing of nitrogenous fertiliser, mulching with straw and untreated control. The highest percentage of mosaic incidence was recorded in control and the lowest incidence was recorded in top dressing of nitrogenous fertiliser. Among the treatments, top dressing of nitrogenous fertiliser showed the best performance in terms of increasing yield (3.05 t/ha). The second highest was obtained in rouging and field sanitation which was statistically similar to spraying malathion 57 EC. The best gross margin ($379.02/ha) and increase of gross margin (63.00%) compared to control were achieved in top dressing of nitrogenous fertiliser with the highest benefit-cost ratio (4.84). However, the treatments were found significantly profitable compared to the control indicating the usefulness of the cultural practices in integrated disease management programme for healthy and profitable jute cultivation.