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Articles by K.S. Islam
Total Records ( 3 ) for K.S. Islam
  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.
  G. Das , K.S. Islam and K.C. Saha
  The effectiveness of different concentrations of rison 60 EC (0.12, 0.20, 0.24%), decis 2.5 EC (0.0125, 0.025, 0.05%) and sunsulfan 20 EC (0.08, 0.10 and 0.15%) were tested on the mortality (%) of different larval instars and adult of Epilachna dodecastigma Muls. under the laboratory conditions. Thirty days old ribbed gourd, Luffa acutangula (L.) plant was used as the experimental crop. Among three chemical insecticides decis showed the highest toxicity which was followed by sunsulfan and rison. The concentration levels of 0.05% decis, 0.15% sunsulfan and 0.24% rison were the most effective against different stages of larvae and adults of Epilachna dodecastigma.
  M.A.M. Khan and K.S. Islam
  Field investigation was carried out on nature and extent of damage of jackfruit borer, Diaphania caesalis Walker (Pyralidae: Lepidoptera) at Jackfruit Research Project, Bangladesh Agricultural University, Mymensingh and in some jackfruit growing areas in Bangladesh. Jackfruit borer attacks the tender shoots, male and female spikes and fruits of all development stages. At flowering stage the larva bores into spike and feeds on internal tissues. At initial infestation, anthesis of the male spikes do not occur and later on the affected spikes are rotten and shaded off from the plant. Severely infested female spikes drop off before fruit setting. The jackfruit borer attacks the jackfruit at different stages of fruit development. Early infestation results in deformation of fruits and sometimes dropping off the immature fruits. The larvae bore into the mature fruit and cause damage to the edible part. Later infested fruits frequently get rotten due to entrance of rainwater in to the fruits. In nursery, caterpillars damage the tip of jackfruit sapling causing retardation of growth of the saplings and initiation of lateral branches. The average percentage of fruit infestation was 27.44. The number of bore and amount of damage per infested fruit was 1.47 and 525.37 g, respectively. The reduction of market price due to jackfruit borer infestation in six locations of Bangladesh ranged from 27 to 39%.
 
 
 
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