Browsing by Author "AHMED, TANVIR"

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FARMERS' KNOWLEDGE ON ENVIRONMENTAL DEGRADATION DUE TO USE OF AGRO-CHEMICALS
(DEPT. OF AGRICULTURAL EXTENSION & INFORMATION SYSTEM, 2009) AHMED, TANVIR
The purposes of the study were to identify the Farmers' knowledge on environmental degradation due to use of agro-chemicals and to determine their selected characteristics, namely education, farm size, annual income, family size, farming experience, organizational participation, cosmopoliteness, innovativeness, and extension contact. The study also explored the relationship between the selected characteristics of the farmers and their knowledge on environmental degradation due to use of agro-chemicals. The study was conductec among the farmers of three villages of Kashkarara union of p :mdanga Upazila under Chuadanga district. Data were collected ['rum a sample of randomly selected 118 farmers out of a total population of 987. The data were collected through personal interview by using an interview schedule during the period from the 6" April to 5th May; 2010. Appropriate scales were developed in order to measure the variables. Pearson's Product Moment Correlation Co-efficient (r) was computed to examine the relationship between the concerned variables. Findings revealed that over half (60.17 percent) of the respondents had low level of knowledge on environmental degradation due to use of agro-chemicals as compared to 33.90 percent medium and 5.93 percent high knowledge. Correlation analysis indicated that seven characteristics of the farmers namely education, farm size, annual income, organizational participation; Cosmopoliteness, innovativeness, and extension contact had sigjtiflcant positive relationships with their knowledge on environmental degradation due to use of agro-chemicals. On the other hand, family size and farming VII' experience of the respondents had no relationship with their knowledge on environmental degradation due to use of agro-chernicals.
INVESTIGATION ON PESTALOTIA LEAF SPOT OF BETELVINE (Piper betle L.) AND ITS MANAGEMENT
(DEPARTMENT OF PLANT PATHOLOGY, 2020) AHMED, TANVIR
Betelvine (Piper betle L.) is an important cash crop grown throughout the year in Bangladesh. Isolation and identification of the causal organism, pathogenicity test and development of management practices against Pestalotia sp. were the main purposes of the investigation. The in vitro experiments were conducted at MS Laboratory, Department of Plant Pathology and the field experiment was conducted in the Central Farm of Sher-e-Bangla Agricultural University (SAU), Dhaka-1207. Pestalotia sp., the causal organism that caused leaf spot of betelvine is a new record in Bangladesh. A survey was conducted in four upazilas viz. Kaligonj, Debhata, Shymnagar under Satkhira district and Debidwar upazila under Cumilla district to investigate the prevalence of Pestalotia sp. causing pestalotia leaf spot of betelvine. The survey study revealed that the disease incidence of pestalotia leaf spot of betelvine ranged from 8.70% to 42.77%. The maximum 42.77% disease incidence was recorded in Kaligonj, Satkhira and the minimum 8.70% disease incidence was recorded in Debidwar, Cumilla. The maximum 13.66% disease severity was recorded in Shymnagar, Satkhira where minimum 2.65% disease severity was recorded in Debidwar, Cumilla. The organism isolated from the diseased leaf was identified as Pestalotia sp. based on its characteristics (CMI Description no. 515) and the pathogenicity was confirmed by following Koch’s Postulates. In the disease mitigation study, four chemical fungicides viz. Autostin 50 WDG, Tilt 250 EC, Goldton 50 WP and Dithane M-45, four plant extracts viz. Garlic clove extract, Ginger Rhizome extract, Onion bulb extract and leaf extract were evaluated. The fungicide Tilt 250 EC and Autostin 50 WDG @500ppm concentration completely (100%) inhibit the mycelial growth of the pathogen in in vitro. In the field condition, maximum 81.74% reduction of disease severity over control was recorded in case of Tilt 250EC, followed by Autostin 50 WDG (67.83%). In case of plant extracts, Garlic clove extract resulted the highest reduction 86.68% of mycelial growth at 1:1 concentration in in vitro and the reduction of disease severity was 60.87% over control in field experiment. In case of 1:2 concentration, the reduction of mycelial growth was less than 1:1 concentration.