Three different fungal diseases were found prevalent namely leaf spot, leaf rot, and foot and root rot of betel vine at five different upazillas of five districts in Bangladesh. Phytophthora parasitica causing leaf rot, Colletotrichum piperis causing leaf spot, and Sclerotium rolfsii causing foot and root rot have been found. The highest incidence (41.60 per cent) and severity (21.86 per cent) of leaf rot disease were recorded at Mohanpur upazilla during the period of August. Minimum incidence (4.24 per cent) of leaf rot was recorded at Kaligong upazilla while minimum severity (2.83 per cent) was recorded at Gouronadi upazilla. The highest incidence of disease (57.44 per cent) and severity of disease (28.32 per cent) of betel vine leaf spot were recorded at same locations and same period of time as per leaf rot disease. Minimum incidence (8.32 per cent) and severity (2.72 per cent) of disease were recorded at Sitakundo upazilla during the period of May. In August at Gouranadi upazilla, highest incidence of disease (27.80 per cent) was filed in case of betel vine foot and root rot while the lowest incidence (6.00 per cent) of disease was reported at Sitakundo upazilla. Lesion sizes were varied in ranging 1.4-2.3 cm in diameter while isolates collected from Mohanpur showed highest pathogenicity caused by Phytophthora parasitica produced lesion 2.3 cm and lowest pathogenicity was recorded by Sclerotium rolfsii produced lesion 1.4 cm isolates collected from Mirpur and Mohanpur. In respects of locations and survey period, it was revealed that betel vine leaf rot and leaf spot were prevalent in Mohanpur upazilla during the month of August under Rajshahi district, and betel vine foot and root rot in Gouronadi upazilla under Barisal district.
The experiment was conducted at Breeder Seed Production Centre, Bangladesh Agricultural Research Institute (BARI), Debiganj, Panchagarh during November to February of 2014-2015 to learn about the bulking behavior of promising potato varieties in Bangladesh with the suitable time of harvest for getting desirable yield. The experiment was employed with randomized complete block design (RCBD) with six harvesting time at 10 days interval started from 40 days after planting (DAP) and continued up to 90 DAP. Six promising potato varieties such as Bari Alu 40 (4.45w), Bari Alu 41 (5.183), Bari Alu42 (Agila), Bari Alu 43 (Atlas), Bari Alu 44 (Elgar) and Bari Alu 45 (Steffi) were included in the study. Tuber yield was increased up to 90 DAP for all the varieties. The highest tuber yield (55.86ton/ha) was recorded in Bari Alu 45 (Steffi) and the lowest yield of tuber was observed in Bari Alu 43 (Atlas) at 90 DAP. The tuber yield increase rate of Bari Alu 45 (Steffi), Bari Alu 41 (5.183), Bari Alu 42 (Agila) and Bari Alu 40 (4.45w) were reasonable up to 90 DAP, while the increase rate of Bari Alu 43 (Atlas) was reasonable up to 80 DAP and Bari Alu 44 (Elgar) was up to 70 DAP. Bari Alu 44 (Elgar) may be harvested as early variety among the varieties. The percent dry matter was increased up to 90 DAP for all the varieties. The growth rate of tuber was higher at 60–70 DAP for all the varieties except Bari Alu 41 (5.183). In case of Bari Alu 41 (5.183) tuber growth rate was higher at 70-80 DAP. Finally, our study demonstrated that, the optimal period to harvest potatoes is 90 days after planting (DAP), when the tubers are at their largest size, have the most yield, and have accumulated the maximum dry matter.
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