Browsing by Author "HASAN, RAKIBUL"

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    ANALYSIS OF PESTICIDE RESIDUES IN VEGETABLES COLLECTED FROM DIFFERENT MARKETS OF DHAKA
    (DEPARTMENT OF ENTOMOLOGY, SHER-E-BANGLA AGRICULTURAL UNIVERSITY, DHAKA., 2015-12) HASAN, RAKIBUL
    The study was conducted to analyze pesticide residues in three common vegetables (country bean, cauliflower and cucumber) collected from five different areas (Banani, Rampura, Mohammadpur, Kawran Bazar and Jatrabari) of Dhaka city from January 2016 to September 2016. The collected samples were analyzed using Quick, Easy, Cheap, Effective, Rugged and Safe (QuEChERS) extraction technique and Gas Chromatography (GC) coupled with Flame Thermionized Detector (FTD) for the determination of pesticide residues in 50 samples of country bean, 30 samples of cauliflower and 20 samples of cucumber. Among the 50 analyzed samples of country bean, 10 samples (20%) contained residues of Dimethoate and Quinalphos of which 5 samples were above the maximum residue limits (MRLs). Out of 30 samples of cauliflower, 5 samples (16.67%) contained residues of Chlorpyrifos, Quinalphos, Acephate and Dimethoate, where 4 samples contained multiple pesticide residues. All the contaminated samples of cauliflower contained residue above MRL. On the other hand, among the 20 samples of cucumber, only 2 samples (10%) contained residue of Quinalphos and Chlorpyrifos, but the level of residue was below the MRL. Dimethoate was detected in most of the contaminated country bean sample, while Chlorpyrifos and Quinalphos were detected mostly in cauliflower and cucumber. This study reflects the overall scenario of pesticide contamination in vegetables specially in country bean, cauliflower and cucumber available in the local markets of Dhaka city, which will help the consumer to be aware of their health and safety.
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    INCIDENCE AND SEVERITY OF RED RUST (Cephaleuros parasiticus karst.) DISEASE IN TEA UNDER DIFFERENT TOPOGRAPHIES OF SOME SELECTED TEA ESTATES AT SYLHET REGION
    (Dept. of Plant Pathology and Seed Science, 2012-12) HASAN, RAKIBUL
    The present study was conducted during April 2013 to July 2013 at different locations with a view to observing incidence and severity of red rust disease in tea under different topographic positions. The surveyed areas included in this study were BTRI farm, Gazipur tea estate, Lackatoorah tea estate, Marina tea estate, Malnichora tea estate, Chundeeche Tea Estate, Burjan Tea estate, Bejoya tea estate, Baraoora (Finlay) tea estate and Moomin cherra tea estate of Sylhet region where three different topographic positions viz. flat, hellock and tillah were considered for data collection on red rust disease incidence of tea. Fifty tea bushes/plants were randomly selected for data collection as much population of tea bushes occupied in each sample. From each location, three samples were taken randomly in each topographic position of tillah, flat and hellock. Variation in relation to incidence and severity of red rust disease of tea were observed in different locations and topographic positions. Under tillah condition, the highest disease incidence (67.33%) and severity (23.20%) were estimated from Lackatoorah tea estate while these were the lowest (25.33% and 8.25%, respectively) was related from Malnicherra tea estate. Under flat condition the highest disease incidence (84.00%) and severity (40.00%) was found in BTRI farm closely followed by Marina tea estate and Chundeeche Tea Estate. The highest disease incidence (80.67%) and severity (34.13%) were recorded from the crop grown under hellock condition at BTRI while the lowest (36.67%) disease incidence was observed at Baraoora tea estate. Tea grown under hellock position of Burjan Tea estate showed the lowest red rust severity (13.33%). The results indicated that there was a negative correlation between elevation and disease incidence. Red rust disease incidence was decreased with an increasing elevation of the plantation. The highest disease incidence and severity of red rust were estimated from the tea grown under flat condition which was followed by hellock and tillah conditions. The average disease incidence of 70%, 59.00% and 49.00% were recorded from flat, hellock and tillah region respectively.