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Articles by M. Khalequzzaman
Total Records ( 11 ) for M. Khalequzzaman
  K.N. Shahjahan Karim , B.C. Das and M. Khalequzzaman
  Population of A. gossypii Glover on Solanum melongena L. was studied. Monthly data were collected from 5 plants along with their natural enemies. Mean monthly temperature, relative humidity, dew point, rainfall, soil temperature and photoperiod were also collected. Correlation coefficient was calculated. Aphid population started growing from August, became highest in January and vanished in April. Multiple correlation coefficient was also highly significant.
  K. N. Shahjahan , B. C. Das and M. Khalequzzaman
  Three insecticides, malathion, sumithion and phorate were tested against Aphis gossypi Glover in different concentrations and observations were recorded after twelve and twenty-four hours on aubergine leaf. The result was much better in case of phorate, less with sumithion and much less with malathion. LD50 values for phorate, sumithion and malathion were 17.59, 108.07 and 364.05 μg after 12 hours and were 4.493, 45.457 and 178.38 μg after 24 hours respectively.
  M. Ferdous Ahmed and M. Khalequzzaman
  Synergism of malathion with cypermethrin, phosalone, phorate and fenitrothion was tested against Musca domestica L. Malathion and other insecticides were mixed in the ratios of 1:9, 3:7, 5:5, 7:3 and 9:1 and applied topically on adult houseflies and the combined LD50 and co-toxicity of co-efficient were calculated after 24 h of treatment. The unsynergised malathion, cypermethrin, phosalone, phorate and fenitrothion gave topical acute LD50 of 606.81, 31.83, 203.95, 153.98 and 209.50 ng/fly respectively. The combined action of malathion with cypermethrin offered LD50 values of 6.94, 12.71, 22.44, 49.50 and 187.17 ng/fly; with phosalone 27.76, 95.31, 201.90, 411.56 and 1779.42 ng/fly; with phorate 2.40, 6.26, 67.99, 88.18 and 264.65 ng/fly; with fenitrothion 37.59, 111.66, 158.94, 320.35 and 433.79 ng/fly for 1:9, 3:7, 5:5, 7:3 and 9:1 ratios respectively. Among the tested pesticides, malathion found least toxic and in case of phorate, the degree of potentiation increased with the increase of its proportion in the mixture. The investigation revealed that the malathion could be potentiated by mixing other pesticides
  Gazi, M. , Akram Hossain , M. Zahidul Islam , M. Aftab Hossain and M. Khalequzzaman
  Five organophosphorus insecticides viz., phosphamidon, quinalphos, malathion, dimethoate and diazinon were tested against mustard aphid, Lipaphis erysimi (Kaltenbach) in field and net house condition. All these insecticides significantly (p<0.05) controlled mustard aphid. Quinalphos was comparatively more effective in controlling mustard aphid followed by phosphamidon
  M. Khalequzzaman and Jesmun Nahar
  Nine insecticides were used in a toxicity test on adult red flour beetle, Tribolium castaneum (Herbst). Mortality tests were done by applying different doses of insecticide following residual-film method in a petridish on laboratory reared 3 to 7 days adults and the data was recorded after 24 hours of treatment. The calculated LD50 values were 13.8221, 53.8803, 8.0592, 424.1043, 223.2351, 8.1755, 920.1590, 243.3920 and 0.2416 μg/cm2 for chlorpyrifos, fenitrothion, malathion, monocrotophos, phosphamidon, carbosulfan, propoxur, cypermethrin and lambda-cyhalothrin respectively. The results indicate that lambda-cyhalothrin was the most toxic and propoxur was least toxic to adult red flour beetles when applied singly. The order of toxicity of the insecticides was lambda-cyhalothrin > malathion > carbosulfan > chlorpyrifos >fenitrothion > phosphamidon> cypermethrin> monocrotophos > propoxur. Lambda-cyhalothrin, malathion, carbosulfan and chlorpyrifos can be used to control red flour beetle in storage and other insecticides can control them moderately.
  M. Khalequzzaman , Hosne Ara , Fatema Zohura and Jesmun Nahar
  The LD50 of malathion, diazinon, dichlorvos, phosphamidon, lambda-cyhalothrin, cypermethrin, carbosulfan and propoxur on adult housefly were 2.9852, 0.1696, 0.2769, 0.3346, 0.0155, 0.0060, 0.0329 and 0.0137 µg/fly respectively. Dichlorvos, diazinon and cypermethrin showed the highest repellency and phosphamidon, malathion and propoxur showed the highest attractancy to both male and female houseflies. Propoxur and carbosulfan showed lower repellency. Lower doses always showed lower repellency and higher attractancy in all tested insecticides.
  M.A. Baki , M.A.A. Rahman , Naznin Ara Khatune , R.A. Zahid , M. Khalequzzaman , M.M. Husain and G. Sadik
  Combined effects of Lambda cyhalothrin and W. calendulacea plant extracts (synergists) were tested against house fly M. domestica L. in methanol. Lambda cyhalothrin offered synergism when used with W. calendulacea extract. It was observed that the plant extract behaves synergism from 1:1 to 1:5 ratios and above.
  S.H. Habib , M.K. Bashar , M. Khalequzzaman , M.S. Ahmed and E.S.M.H. Rashid
  Ten local biroin rice varieties were evaluated with a view to find out variability and genetic association for grain yield and its component characters. All the characters tested were showed significant variation among the varieties. The highest genetic variability was obtained in flag leaf area and filled grains/panicle. High heritability associated with high genetic advance was observed in filled grains/panicle, 1000-grain weight flag leaf area, harvest index and grain yield. Genotypic correlation coefficients were higher than the corresponding phenotypic correlation coefficients in most of the cases. Plant height, days to maturity and filled grains/panicle showed significant positive correlation with grain yield. Path analysis revealed that plant height, days to maturity, 1000-grain weight and chlorophyll content had positive and highest direct effect on grain yields. Moreover, panicle length had highest indirect effect on grain yield through plant height and filled grains/panicle had positive and higher indirect effect on grain yield through days to maturity, panicles per hill and panicle length.
  Gazi M. Akram Hossain , M. Zahidul Islam , M. Aftab Hossain and M. Khalequzzaman
  The effect of five organophosphorus insecticides viz., phosphamidon, quinalphos, malathion, dimethoate and diazinon were studied on the growth parameters and yield of mustard. Growth parameters such as plant height, number of branches, number of pods, number of seeds per pod, viable seeds per pod and yield were found to be increased significantly with the application of insecticides both in the field and in net house conditions. The response of quinalphos was found to be comparatively more suitable for various growth parameters and yield, followed by phosphamidon, dimethoate diazinon and malathion.
  M. Zahidul Islam and M. Khalequzzaman
  With a view to potentiate malathion by other insecticides, experiments were carried out with eight insecticides like, dichlorovos, pirimiphosmethyl, phenthoate, monocrotophos, diazinon, cypermethrin, lambda-cyhalothrin, and propoxur. All tests were done by the topical application of the insecticide mixtures on adult housefly, Musca domestica L. Toxicity of malathion was determined when applied alone and low dose of each insecticide was mixed with malathion in ratios of 1:1, 1:2, 1:5, 1:10 and 1:20. Separately. The mortality data after 24 hours of application showed that nearly all insecticides offered increased toxicity of malathion. But when it was applied jointly with lambda-cyhalothrin and cypermethrin the potentiation results were maximum.
  T.L. Aditya , M.E. Hoque and M. Khalequzzaman
  High frequency callus induction ability was achieved from well-germinated embryos (on hormone free MS media) of eight indica rice genotypes by culturing on MS medium supplemented with 2 mg l-1 2,4-D and solidified with 0.3% phytagel. When mature seeds were directly cultured, the highest frequencies of callus induction were observed for two genotypes (IR51491-AC5-4 and BR24) out of eight genotypes tested. However, embryogenic callus induction ability of different genotypes significantly differed. Calli from scutellar tissue formed yellow, compact, friable and globular type embryogenic calli designated as embryogenic (E) type I. In contrast when callus produced from root regions of germinated embryo all genotypes showed high callus induction ability and formed soft-friable, pale yellow, shiny and nodular calli designated as embryogenic type II. In both case crystalline, hard, white with suppressed root primordia were formed which were designated as non-embryogenic (NE) calli. The simple procedures described in this paper provide an efficient protocol for reproducible callus induction method of Bangladeshi rice varieties/line, which is pre-requisite for a good regeneration system and a source of fine embryogenic cell suspension cultures for protoplast isolation and genetic transformation method.
 
 
 
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