Journal of Plantation Crops 2019-08-21T13:59:07+0530 Editor Open Journal Systems <p>As a multidisciplinary journal, Journal of Plantation Crops (JPC)&nbsp;aims at dissemination of research findings in plantation crops (coconut, arecanut, cocoa, cashew, oil palm, coffee, tea, rubber, date palm), including cropping systems, as well as various spices. Since its inception in 1973, 45 volumes have been published. The journal is published thrice a year during April, August and December and publication of the articles is subject to peer reviewing and recommendation by experts in the field.</p> Characterization of Lasiodiplodia theobromae causing leaf blight disease of coconut 2019-08-20T12:36:42+0530 R. Ramjegathesh I. Johnson K. Manjunath Hubali H.P. Maheswarappa <p>Coconut leaf blight pathogen <em>Lasiodiplodia theobromae</em> (Pat.) was characterized based on morphological, cultural characters and Internal Transcribed Spacer (ITS) sequences. Pathogen isolates collected from various coconut growing areas of Tamil Nadu, India showed significant differences in the colony morphology, colour, spore dimensions and fruiting bodies. Molecular characterization by partial sequencing of ITS region confirmed the identity of pathogen as <em>L. theobromae</em>. Among the several methods of inoculation employed to establish the pathogenicity, pinprick method with spraying of conidial suspension (10<sup>5</sup> spores mL<sup>-1</sup>) and spot application of mycelial mat (5 mm disc) at the inoculation site produced typical necrotic spots and lesions on coconut leaves of West Coast Tall, Arasampatti Tall, Chowghat Orange Dwarf and Chowghat Green Dwarf. Koch’s postulates were established to confirm pathogenicity. The result of the study helps to streamline the existing management strategies.</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Investigations on self-compatibility and extent of self and cross pollination in cashew 2019-08-20T14:27:51+0530 E. Eradasappa, G.S. Mohana <p>To address the issues of presence of self-incompatibility and extent of self and cross pollination in cashew, studies were carried out employing eight cultivars and four types of pollinations <em>viz</em>., self-pollination, geitonogamy, hand self-pollination, hand cross pollination. Observations on percentages of initial fruit set, final fruit set, fruit shed as well as total fruit set were recorded. The cultivars differed significantly for all the traits studied. In hand self-pollination, initial fruit set varied from 7.97 to 17.03 per cent. The final fruit set ranged from 10.47 to 3.13 per cent. The fruit shed varied from 9.53 to 1.85 per cent. The total final fruit set varied from 12.50 per cent (NRCC Sel-2) to 41.88 per cent (Ullal-3). In hand cross pollination, the initial fruit set varied from 9.30 to 18.83 per cent. The final fruit set ranged from 3.77 to 7.90 per cent and the fruit shed varied from 4.12 to 15.06 per cent. The total final fruit set ranged from 15.06 per cent (Priyanka) to 31.58 per cent (NRCC Sel-2). Cultivar, Ullal-3 showed more fruit set in self-pollination and geitonogamy. All the varieties were found to be self- compatible and hence self-incompatibility does not seem to operate in cashew. Six varieties were cross-compatible and two were partially cross-compatible as female parents. The study indicated that self as well as cross pollination play significant roles in fruit set in cashew. The estimates of heritability in broad sense and genetic advance for final fruit set were high in self- pollination and geitonogamy, high and moderate in hand self and cross pollinations.</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Electrophysiological and behavioral response of red palm weevil, Rhynchophorus ferrugineus (Olivier) (Coleoptera: Dryophthoridae) to fermented coconut sap neera 2019-08-20T14:33:28+0530 Vibina Venugopal Kesavan Subaharan <p>Red palm weevil (RPW) (Coleoptera: Curculionidae) is a lethal pest of coconut in India and various palms across the world. Fermenting toddy has been traditionally used for trapping RPW. The traditional method of collecting neera, the coconut inflorescent sap, in an open earthen pot emanates volatiles that attract these insects. In this study, the volatile compounds released from fermenting neera were characterized and the compounds that cause physiological and behavioral response to RPW were established using electrophysiological and behavioural assays. Acetoin, which caused the neuronal response in adult RPW antennae, was present in head space volatiles of fermenting neera from day one onwards. Fermenting neera, when used in tandem with aggregation pheromone, trapped a high number of weevils (53.2 per trap) suggesting possibilities of its use in RPW management.</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Evaluation of cowhage (Mucuna pruriens L.) genotypes for growth, yield and quality characters in arecanut plantation under hill zone of Karnataka 2019-08-20T14:36:25+0530 Vinay Patil, Sadashiv Nadukeri, Shashikala Kolakar K. Hima Bindu <p>Cowhage (<em>Mucuna pruriens</em> L.) is leguminous medicinal plant grown in the tropics. Eight cowhage genotypes were used to study the performance of their growth, yield and quality characters in arecanut plantation under hill zone of Karnataka. Significant differences were recorded in genotypes with respect growth, yield and quality attributes. The genotype Arka Dhanvantari recorded the maximum vine length (282.03 cm) and number of trifoliate leaves (71.03) at harvest. Maximum number of bunches per plant (6.47), stem girth (0.93 cm), pods per bunch (4.00), number of bunches per plant (4.67) and pod yield per plant (136.38 g) was produced in genotype IIHR Selection-2. Genotype Arka Aswini exhibited maximum pod length (11.02 cm) and pod width (1.89 cm) over other genotypes. Maximum seed yield per plant (96.13 g), per plot (2.88 kg) and per hectare (3384.56 kg) was recorded in the genotype IIHR Selection-2. Genotype Arka Aswini exhibited maximum 100 seed weight (136.23 g). Maximum L-DOPA content (5.17 %) was recorded in genotype Arka Aswini which was followed by IIHR Selection-2 (4.69 %). The genotype IIHR Selection-2 recorded maximum L-DOPA yield (4.52 g plant<sup>-1</sup>).</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Coconut-growing soils in southern Karnataka: Characterization and classification 2019-08-21T12:13:56+0530 R.K. Avinash K.S. Anil Kumar, K.S. Karthika, B. Kalaiselvi, K. Sujatha <p>A study was carried out to characterize and classify major coconut-growing soils of southern Karnataka and to evaluate the suitability of these soils for coconut cultivation. Seven locations were selected on the map of coconut-growing areas in southern Karnataka and delineated based on the variability of agro-climate with the help of land resource map and report of Karnataka state, generated at 2,50,000 scale by ICAR-NBSSLUP. The regions included Hosadurga (central dry zone), Gubbi and Turuvekere (eastern dry zone), Krishnarajapet (southern dry zone), Arasikere (southern transition zone), Belthangadi and Brahmavara (coastal zone) representing the density of coconut-growing areas in different agro-climatic zones. Soil profiles were studied at these selected sites. The coconut growing soils of southern Karnataka are generally deep, gravelly and well drained, sandy clay loam to clayey in texture with good structure. Soils of high rainfall areas of Belthangadi and Brahmavara were strongly acidic and rich in soil organic carbon, whereas other locations of sub-humid to semi-arid were near neutral to moderately alkaline soils with medium organic carbon content. Cation Exchange Capacity and base saturation were very low in coastal red and lateritic coconut soils and ranged from medium to high in other areas. The major taxa of the soils identified at sub-group level of soil taxonomy are <em>Rhodic Kanhaplustults, Ustic Kandihumults,</em> <em>Rhodic Paleustalfs, Typic Rhodustalfs and Vertic Haplustepts.</em></p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Carbon sequestration potential of coconut based cropping systems under integrated nutrient management practices 2019-08-21T12:17:26+0530 K. S. Naveen Kumar H. P. Maheswarappa <p>Carbon sequestration plays a major role in mitigating climate change by converting atmospheric carbon into long lived wood biomass and soil carbon pool. The present investigation emphasizes sequestration of above ground and soil carbon stock of coconut based cropping systems under integrated nutrient management (INM) practices. The experiment was conducted with three cropping sequences of vegetable crops as intercrops in coconut garden under four different integrated nutrient management practices in FRBD with five replications during 2012 to 2014 at Horticulture Research and Extension Station, Arasikere, Hassan District, Karnataka (India). The incremental increase in the carbon sequestration by palms after two years was to the tune of 3.01 t ha<sup>-1</sup> under intercropping system compared to 2.31 t ha<sup>-1</sup> recorded under the monocropping system. Baby corn-gherkin sequence recorded significantly the highest soil carbon stock <em>i.e.,</em> 19.17 Mg C ha<sup>-1</sup> and 20.43 Mg C ha<sup>-1</sup> at 0-30 cm depth during 2012-13 and 2013-14, respectively. Among the INM practices, soil carbon stock was significantly the highest in treatment with 5 tonne FYM + 50 per cent N as vermicompost + 50 per cent N as CCP + vermiwash spray + <em>Azotobacter</em> (21.16 Mg C ha<sup>-1</sup> and 20.95 Mg C ha<sup>-1</sup> at 0-30 cm, during 2012-13 and 2013-14, respectively) and the lowest was in inorganic fertilizer alone (17.94 Mg C ha<sup>-1</sup> and 17.96 Mg C ha<sup>-1</sup> at 0-30 cm, during 2012-13 and 2013-14, respectively). A significant difference was observed in the soil carbon pool potential due to interaction of the cropping sequence and INM practices and it was the highest under green manure–cucumber sequence coupled with application of 5 t FYM + 50 per cent N as Vermicompost + 50 per cent N as composted coir pith (CCP) + Vermiwash spray + Azotobacter at 0-30 cm depth (21.49 mg C ha<sup>-1</sup> and 19.81 mg C ha<sup>-1</sup> during 2012-13 and 2013-14, respectively).</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Multivariate analysis of oil palm germplasm for vegetative and bunch yield traits 2019-08-21T13:15:04+0530 H.P. Bhagya P.M. Gangadharappa B. Kalyanababu Mahantesh B. N. Naika, D. Satish R.B. Naik <p>Multivariate analysis of oil palm germplasm for vegetative and bunch yield traits</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Enhancement of yield in nutmeg (Myristica fragrans Houtt.) through pruning 2019-08-21T13:18:31+0530 Sharon Aravind, K. Kandiannan, J. Rema S. J. Ankegowda R. Senthil Kumar <p>Enhancement of yield in nutmeg (<em>Myristica fragrans</em>&nbsp;Houtt.)&nbsp;through pruning</p> <p>&nbsp;</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## First report of two chalcidoids parasitizing arecanut inflorescence caterpillar, Tirathaba mundella Walker (Lepidoptera: Pyralidae) from Karnataka, India 2019-08-21T13:56:11+0530 E. K. Saneera Chandrika Mohan Shreevihar Santhosh Shivaji H. Thube <p><strong>First report of two chalcidoids parasitizing arecanut inflorescence&nbsp;</strong><strong>caterpillar, <em>Tirathaba mundella</em> Walker (Lepidoptera: Pyralidae)&nbsp;</strong><strong>from Karnataka, India</strong></p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement## Effectiveness of training programme on oil palm technologies for multipurpose extension officers of state department of horticulture, Andhra Pradesh 2019-08-21T13:59:07+0530 M. V. Prasad, P. Sowjanya, N. S. Rao, A. Sarkar, T.O.V. Kumar, K. Rajesh, K. Srikanth <p>Effectiveness of training programme on oil palm technologies for multipurpose extension officers of state department of horticulture, Andhra Pradesh</p> 2019-08-20T00:00:00+0530 ##submission.copyrightStatement##