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Articles by Mahbuba Jahan
Total Records ( 2 ) for Mahbuba Jahan
  Mohammad Shaef Ullah and Mahbuba Jahan
  Effectiveness of two chemical approaches in controlling brown planthopper, Nilaparvata lugens (Stal.) and their impact on the predator carabid beetle, Ophionea indica (Thunberg) were evaluated at Bangladesh Agricultural University during aman season. Carbofuran (Brifer 5G) was applied in Need Based Control (NBC), as judged by periodic monitoring on the level of the pest population and recommended economic thresholds. Schedule Based Control (SBC) consist of application of carbofuran (Brifer 5G) and monocrotophos (Azodrin 40 WSC) on a schedule basis. Mean number of brown planthoppers and the carabid beetles were compared in different control approaches including the natural control, where no insecticide was applied and the control was largely by the activities of naturally occurring predators. In natural control approach a high level of predatory carabid beetle was found in the field compared to the need based and schedule based protection. The population of carabid beetle fluctuated quite synchronously with the density of brown planthopper. The carabid beetle, O. Indica was found to keep the brown planthopper population down to a considerable level when chemical insecticide was not applied.
  Mahfuj Ara Begum , Mahbuba Jahan , M.N. Bari , M. Mofazzel Hossain and N. Afsana
  Life cycle of Micraspis discolor (Fabricious), a predator of brown plant hopper (BPH), Nilaparvata lugens (Stal) was studied in the laboratory and its potentiality in biological control was investigated. A female M. discolor laid an average of 117.7 eggs in 25.1 days of oviposition period. Preoviposition period ranged from 5-10 days with an average of 6.6 days. The eggs hatched in 2-3 days with 83.7% hatching success. Predator had 4 larval instars requiring a total period of 12-15 days. Mean developmental period of the predator was 20.2 days. Male and female beetles lived for 27.4 and 32.4 days respectively. A predator larva consumed an average of 47.6 third instar brown plant hopper, while an adult beetle consumed an average of 112.6 BPH during 30 days after emergence. Predator, M. discolor both in larval and adult stage showed preference for second and third instar brown plant hopper.
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