Field surveys were carried out in three Bhut Jolokia growing districts viz., Sivasagar, Jorhat, Golaghat of Upper Assam to assess the incidence of viral diseases during 2009-11. The incidence of virus diseases varied in farmer's field with an average ranged from 8-72% .Four different viruses were identified based on symptomatology, transmission, host range and serological assays. The mosaic disease was detected to be cucumovirus, potyvirus leaf and stem necrosis disease to be caused by tospovirus and leaf curl disease caused by begomovirus. Cucumovirus , Potyvirus and Tospovirus were easily transmitted by grafting and sap inoculation to Bhut Jolokia and other hosts tested. However, begomovirus was found to be graft transmissible whereas sap inoculation failed to produce any symptom on host plants. Mixed infection of Cucumovirus and Potyvirus was separated by sap inoculation on Datura stramonium. Cucumovirus produced local lesion while Potyvirus produced chlorotic lesion on D. stramonium. DAS-ELISA revealed highest incidence of Potyvirus (87.50%) followed by Cucumovirus (75.00%) and Tospovirus (62.50%) in Golaghat while lowest incidence (31.25-33.33%) of virus diseases was recorded in Sivasagar for all the four viruses. However, overall incidence of Begomovirus was low in all the surveyed fields.
The productivity of onion crop is poor due to inappropriate management and agronomic practices in Bangladesh. To figure out the effect of NPK fertilizer rate and spacing on growth parameters of onion a field experiment was conducted. The treatments were consisting of N fertilizer (0, 80,120 and 160 kg/ha), P fertilizer (0, 30, 50 and 70 kg/ha), k fertilizer (0, 50, 75 and 100 kg/ha) and three plant spacing viz., 10 cm × 10 cm, 15 cm × 10 cm and 20 cm × 10 cm. The experiment was designed in RCBD with three replications. Analysis of results indicates that the interaction effect of NPK rate and spacing shows significant (P<0.05) effect on plant height. Highest plant height was obtained in 20 cm × 10 cm spacing and application of 160 kg N/ha, 70 kg P/ha and 100 kg K/ha respectively. Moreover, maximum number of leaves was also found by plants spaced at 10cm and application of highest dose of fertilizers. Lowest plant height and number of leaves was attained in 10 cm × 10 cm spacing and without NPK fertilizer application. The total result analysis reveals that best growth performance of onion was found from 20 cm × 10 cm spacing combined with 160 kg N/ha, 70 kg P/ha and 100 kg K/ha fertilizer amendment. Res. Agric., Livest. Fish.6(1): 19-25, April 2019
Six fungicides viz., mancozeb 75 WP @ 0.2%, chlorothalonil 75% WP @ 0.2% , tricyclazole 75% WP @ 0.1%, iprodione 25% + carbendazim 25% WP @ 0.1% , difenconazole 25% EC @ 0.1%, azoxystrobin 23 SC @ 0.1% were evaluated for managing leaf spot (Alternaria polianthi) of tuberose (Polianthes tuberosa L.) cv. Single Petal with during kharif, 2010-2013. Four sprays with azoxystrobin (0.1%) at 15 days interval, starting on disease appearance proved to be the most effective and resulted in the lowest disease incidence (10.98 PDI ) compared to control ( 34.39 PDI ). This treatment also gave a fairly good benefit: cost (B: C) ratio of 6.87. The economic analysis, however, revealed the effectiveness of a combo fungicide, iprodion (25%) + carbendazim (25%), followed by difenconazole when they were applied at 0.1% concentration. These treatments recorded highest B:C ratio of 7.11 and 6.90 with 69.98% and 71.47% disease reduction, respectively.
Five hybrid brinjal varieties viz., Ketan, Vijay Kiron, Utkal Green, NV2035 Sarpan Bharata and two local cultivars viz., JC-1, Longai were evaluated at Horticultural Research Station, Kahikuchi, Guwahati as late rabi crop during 2014-16. Significant variation in plant growth parameters and fruit yield as well as on bacterial wilt incidence (Ralstonia solanacearum) were shown by all the varieties.Utkal Green recorded the highest per plant fruit yield (2.32 kg/plant) leading to the maximum total marketable yield (469.66 q/ha) and longer active fruiting duration (43.70 days).It also showed resistant reaction to bacterial wilt, recording only 12.44 per cent wilt incidence as compared to other varieties where it was in the range of 34.44 to 62.22 % at 55 days after transplanting. Although, Ketan and Vijay Kiron recorded moderately higher per plant fruit yield of 1.52 and 1.47 kg/plant,respectively but their total marketable fruit production reduced substantially due to high incidence of bacterial wilt (62.22 and 57.78%, respectively).The local cultivars, JC-1 and Longai exhibited moderately resistant reaction to bacterial wilt which registered 40.00 and 34.44 % , respectively.
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