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.
A field experiment was conducted at Horticultural Research Station, Assam Agricultural University, Kahikuchi, Guwahati during 2009 to 2016 for evaluation of the performance of black pepper varieties/hybrids grown as mixed crop in 16 years old block of arecanut garden (Variety-Kahikuchi Local). Varieties such as, Panniyur-2, , Panniyur-4, Panniyur-5, Sreekara, Subhakara, Panchami, Pournami, PLD-2, Chumala, Karimunda and hybrids such as Panniyur-1 and Panniyur-3 were grown in three replications. Among the varieties /hybrids, Karimunda, Panniyur-5, Sreekara, Subhakara and Panchami produced higher number of laterals with more spread at six years age compared to the other varieties. Panniyur-5 recorded significantly higher number of spikes (210.3) followed by Karimunda (186.2); whereas the lowest was recorded in Panniyur-2 (62.8). The spike length was the highest in Panniyur-1 (16.4 cm), but was on par with Panniyur-1 and Subhakara. Sreekara recorded the lowest spike length of 10.2 cm. Three years mean dry berry yield indicated that , the yield was significantly higher with Panniyur-5 (1.25 kg/vine) followed by Panniyur-1 (1.15 kg/vine) and Subhakara (1.12 kg/vine) which differed significantly over the other varieties. Variety PLD-2 recorded higher oleoresin content (13.84%) and was on par with Panchami and Pournami. Piperine content was the highest in Panniyur-2 (4.65%) followed by Panniyur-1 (4.26%). Due to the mixed cropping of black pepper in arecanut garden, an improvement in the arecanut yield was observed (2.21 kg chali/ palm/year) during 2015-16 compared to the arecanut monocrop (1.96 kg chali/palm/year) during 2009-2010.
The field experiment was conducted at Horticultural Research Station, Kahikuchi of Assam Agricultural University for four consecutive years (2012–13 to 2015–16) to study the performance of flower crops as intercrop in adult coconut (Cocos nucifera) garden spaced at 7.5 m × 7.5 m taking five commercial flower crops, viz. Tuberose (Polianthes tuberosa) var. Single, Gerbera (Gerbera jamesonii) var. Red Monarch, Bird of Paradise (Strelitzia reginae) var. Glauca, Gladiolus (Gladiolus grandiflorus) var. Oscar, Marigold (Tagetes erecta) var. Siracole along with a control (coconut monocrop). Results showed that number of leaves on the crown, annual leaf production, number of inflorescences per palm and nut yield of coconut was not significantly influenced by the flower crops grown in coconut garden. Significantly the highest total coconut equivalent yield of 48920 nuts/ha/year was obtained in coconut + gerbera followed by coconut + tuberose (42717 nuts/ha/year), coconut + gladiolus (42334 nuts/ha/year) and the lowest in coconut as monocrop (10430 nuts/ha/year). Intercropping system of growing gerbera in coconut garden registered the highest net income (` 380075/ha) and B:C ratio (3.5) followed by tuberose (` 323420/ha and 3.1), gladiolus (` 315090/ha and 2.9), marigold (` 233050/ha and 2.8) and the lowest net income of ` 64050/ha and B:C ratio (1.6) obtained in monocropping of coconut.
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