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Articles by M. Jahan
Total Records ( 2 ) for M. Jahan
  T.K. Biswas , M.A. Rahman , M.M.H. Khan , M.M. Alam and M. Jahan
  The experiment was conducted in the net house and laboratory to determine the effectiveness of two insecticides viz., Cymbush (Cypermethrin) and Brifer (Carbofuran) on brown plant hopper, Nilaparvata lugens and the toxic action of these insecticides to the predators lady bird beetle, Micraspis discolor and wolf spider, Lycosa pseudoannulata. Effectiveness of the insecticides was assessed on the basis of percentage of corrected mortality of brown plant hopper, lady bird beetle and wolf spider under laboratory condition at 24, 48 and 72 h after treatment. Cymbush 10EC @ 0.05 kg a.i. ha-1. caused 100% mortality of insect populations at different time intervals. All the doses of Brifer 5G caused a good mortality of N lugens at different time intervals and was effective at higher dose. Cymbush 10EC @ 0.04 kg a. i. ha-1. and Brifer 5G @ 0.5 kg a.i. ha-1. were found very effective against N. lugens. The effectiveness of Cymbush 10EC decreased and Brifer 5G increased with increasing time interval. Cymbush 10EC @ 0.05 kg a.i. ha-1. was highly toxic and 0.01 kg a.i. ha-1. was less toxic to both the predators. Brifer 5G @ 0.5 kg a.i. ha-1. was least toxic to the predators. Between the two predators L. pseudoannulata was more susceptible to the insecticides than M. discolor.
  G. Das , K.S. Islam and M. Jahan
  The effect of different levels of urea was investigated on the extent of damage of rice caseworm, Nymphula depunctalis (Gn.). Data were collected on infested hill, tiller, leaf, number of cases/m2 and position of case in leaf at different ages of the plant viz. 20, 27, 34, 41 and 48 days after transplanting (DAT). Grain yield (t ha-1) was recorded after harvesting. The infestation of N. depunctalis was significantly different in all the parameters measured except in the position of case in leaf when different levels of urea were applied. The highest infestation was observed from the plot treated with 190 kg urea ha-1 and the minimum from 130 kg. The infestation was maximum at 27 DAT which declined thereafter. The lowest yield was obtained from the plot treated with high level of urea. The implication of urea on the level of infestation of N. depunctalis is discussed.
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