Browsing by Author "Alam, M. Shahidul"

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A study on Black band disease of jute in the Northern part of Bangladesh
(University of Rajshahi, 2003) Ali, Md. Forman; Alam, M. Shah; Alam, M. Shahidul
Black band disease of jute ( Corchorus capsu/aris L. and C. olitorius L.) caused by lJoflyodip/odia theobromoe Pal. was studied during .lune' 1999 to October'200 I in Northern part of 13angladesh. The per cent or disec1sed jute plants were ranged between 19-27%. Optimum conidial germi1rntion of B. theobromae occurred al 25°-30°C, at pH 6 to 7 and at RH l 00%. The l'ungus prefer 1.5% glucose and l: l 5 (w/v) concentrations of cowclung sqlution for its conidial germination. Whereas, 1% KNO3 and NaNO3 salt solution gave better germination or conidia. The fungus freely germinates higher (93%) in river water compared lo those from other sources of waler. The highest mycelial growth c1nd dry weight orB. theobromac> was observed in PD;\ and lowest in Richard's medium. On the other hand. formation of conidia showed reverse effect in both the media. When the l'ungus was cultured on 20% cowdung medium showed better growth. 3%concentration of boron had good elTect on mycelial growth of B. rheobromae. Mustard oil cake is more favorable for the mycelial grovvth of B. theobromae than that or Linseed oil cake. Among the dirlercnt plant extracts tested, Datura mete/ medium showed better inhibition in culture. The growth or the llmgus was found to be affected by the different light conditions and heller growth was recorded in continuous light condition. -------
Integrated Management of Foot-Rot Disease of Piper Betle L. Caused by Sclerotium Rolfsii
(University of Rajshahi, 2016) Sarkar, Md. Montaz Ali; Alam, M. Shahidul
Foot rot disease of betelvine is a serious fungal disease caused by Sclerotium rolfsii. Eight cultivars of betelvine were identified on survey period and found the highest and the lowest disease incidence in cultivars Bangla and Sanchi. Among the places, Mohanpur areas of Rajshahi district showed the highest disease infected areas than that of other places in different districts. The disease incidence also varied from place to place and year to year. During survey period, loamy soil planted borojes showed the highest disease incidence and sandy loamy soil borojes showed the lowest disease incidence. Flood systems irrigated borojes showed the highest and drip system irrigated borojes showed the lowest disease incidence of betelvine. Positive correlation existed between the disease incidence and the weather factors like rainfall, number of rainy days and relative humidities. The morphological variation was observed among ten isolates of S. rolfsii and isolates-5 showed the highest virulence. The highest per cent mycelial growth was observed in cellulose containing carbon sources medium and in sodium nitrate, nitrozen sources medium. Phytohormone 2, 4 D inhibited hundred per cent mycelial growth of the fungus. Clove and Cinnamum oil inhibited hundred per cent mycelial growth of the fungus at all concentrations at PDA medium. Urea fertilizer inhibited hundred percent mycelial growth of the fungus. Neem cake at 3% concentration inhibited hundred percent mycelial growth of the fungus. Cow dung and cow urine also had inhibitory effect on mycelial growth of the fungus. Nicotinic acid showed inhibitory effect of the fungus. At all concentrations NaHCO3 and NH4HCO3 showed complete inhibition mycelial growth of the fungus. Complete inhibition of mycelial growth of S. rolfsii was observed with treatment after A. sativum and Lawsonia inermis plant extracts. Hundred per cent mycelial growth inhibition was observed in Allium sativum and Lawsonia inermis, extracts at all concentrations in dried plant extracts. Hundred per cent mycelial growth inhibition was observed in Allium sativum ethanolic extracts. Complete inhibition of mycelial growth was observed in folicure and score fungicides. Herbicides Logran and 2, 4-D inhibited hundred per cent mycelial growth at all concentrations. Insecticides Desis and Moventa at all concentrations showed the same results. The highest per cent mycelial growth inhibition was observed in Trichoderma isolates-3 and the lowest in Trichoderma isolates-14. Among the ten Trichoderma isolates culture filtrates, isolates-3 had shown maximum per cent mycelial growth inhibition. The highest per cent disease incidence observed in 03 months old betelvine plantation. The lowest viability of sclerotia was observed at 5 cm depth with black plastic mulching. The lowest per cent disease incidences were recorded after treatment with 60 days solar heating. Maximum reduction in sclerotial germination was observed in soil amended with neem cake. No viability of the fungus was recorded upto 30 minutes hot water treatment at 52C and above. The lowest disease incidences were recorded after treatment hot water 0.5 Lit/kg cultural practices. The lowest disease incidence was recorded after treatment with neem cake, A. sativum, Score, Trichoderma iso-3, N200P100K100 respectively in field. The effect of crop rotation by sugarcane cultivation found the lowest disease incidence. Out of eight cultivars, only one cultivar, namely, sanchi showed moderately resistance reaction. In case of IDM effect, the lowest disease incidence was recorded in treatment T9 by (sanitation + neem cake 6t/h + application A. sativum extract 5% + application T. harzianum + score 1.0% drenching (neem cake, A. sativum and Trichoderma at quarterly intervals and score at monthly intervals) and increasing production number of leaves in lakh/hac/year.
Studies on the Biologically Active Constituents of Lichens
(University of Rajshahi, 2008) Rekha, Shahina Begum; Islam, Md. Nurul; Alam, M. Shahidul
In the antimicrobial activity test majority of the thirteen lichen extracts (named h1, h2, h3, h4, h5, h6, h7, h8, h9, h10, h11, h12 and h13) offered antibacterial (against S. aureus, B. megaterium, 8. subtilis, B. cereus, S.-/J- hemolytic, S. lutea, S. typhi, S. dysenteries, S. Shiga, S. sonnies, S. boydii and E Coll), as well as antifungal (against A flavus, A. fumigatus, C. albicans, Mucor sp. and F. vasinfectum) activity; while against E. coli no efficacy was traced with the same dose maintained for the bacterial isolates. The dose was set for the antibacterial activity test as 200 µg/disc for all the extracts and the standard Ciprofloxacin was used 1 0µg/disc for comparison…………………………