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CORD
Published by International Coconut Community
ISSN : 02151162     EISSN : 27218856     DOI : 10.37833/cord
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Library & Information Science
Aims CORD aims to publish original research results and reviews on research and development. While encouraging those involved in research and developments to disseminate their finding it also assists policy makers and planners to be aware of the latest developments in the sector Scope CORD encompasses a broad range of research topics in animal sciences: seedlings and genetics, farming, harvesting, production, health, biotechnology, and production, socio-economic, and policy.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 390 Documents
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STUDIES ON CHELONUS SP. THE PARASITE OF THE COCONUT MOTH BATRACHEDRA ARENOSELLA WALKER Wily A. Baringbing; Bariyah Baringbing
International Coconut Community Journal Vol 13 No 01 (1997): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v13i01.308

Abstract

An experiment was conducted at a coconut pest laboratory at Nita, elevation 250 m, Sikka regency, Flores island, province of East Nusa Tenggara, to study mass production of Chelonus parasite by using Phthorimaea operculella Zeller as its host, in an effort to control the coconut moth, Batrachedra arenosella Walker, biologically. Results of the experiment showed that the parasite could be produced in laboratory by using P. operculella as the host and a 10% solution of honey as food for both parasite and the adult host. A female parasite gave an average of 14 offspning during their lives with a sex ratio of 2.27:1, between male and female. The sex ratio of the same parasite in the field with B. arenosella as its host was 1:1. The incubation period of the parasite in laboratory was 26 days for males and 27 days for females. The sex ratio of the moth in the field as 1: 1.26.
COCONUT YIELD IMPROVEMENT IN FARMERS' FIELDS THROUGH RESEARCH BASED FERTILIZATION MANAGEMENT IN THE PHILIPPINES Severino S. Magat Ph.D.
International Coconut Community Journal Vol 13 No 02 (1997): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v13i02.309

Abstract

For the past 20 years, the development of leaf analysis or foliar diagnosis ofcoconut, supported and confirmed by a network offertilizer experiments (on­station and on‑farm trials) demonstrated the significance of improving coconut yields in terms Of nuts and copra through balance nutrition or fertilization ofpalms. In the Philippines, emphasis on the correction of the widespread deficiencies in N, Cl, S and K had been achieved even in small‑scale farms with 142% average increase in nut yield and 179% increase in copra terms after 3‑4 years of application at moderate rates offertilizers. Research findings are discussed in relation to the coconut rehabilitation of mature stands and the utilization of coconut hybrids in the ‑ sustainable coconut development.
EVALUATION OF GENOTYPES ARISING FROM F2 GENERATION SEGREGATIONS IN DWARF X TALL CROSSES OF COCOSNUCIFERA WMU Fernando; L. Perera
International Coconut Community Journal Vol 13 No 02 (1997): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v13i02.310

Abstract

Twenty seven F2 generation palms belonging to selfed and crossed families of F1, palms arising from a cross between dwarf green and Tall in Cocos Nucifera were studied for vegetative, reproductive and yield characters. The objective was to study the segregation patterns of the introgressed characters of the Dwarf x Tall hybrid in the F2 generation and, to investigate the effects of selfing. An average of four palms were studied in each F2 family. The time takenfor initial flowering was spread in a greater range in F2 families arising from selfed F1, compared to F2 families originating from crossing two different F1 palms. The pollination behaviour of the palms revealed to be segregating in two selfed F2 families. Two palms, one in each F2 family (selfed F1) were found to be autogamous with overlapping male and female phases whilst the rest showed allogamy. Recombination of the autogamous nature along with the Tall characters were observed in the F2 palms. The results suggest that the genetic control of the pollination behat4our is polygenic and an aggregate of several recessive genes are responsible for the autogamous nature of the palm. Certain genotypes arising from selfed families recorded high husked nut weights (650 ‑ 700 gms) compared to crossed families indicating their resistance to in breeding depression. The possibility of extracting recombined lines with desirable characters in order to improve the Sri Lankan Dwarf x Tall is also discussed
HOST RESISTANCE IN COCONUT LEAVES AGAINST LEAF BLIGHT DISEASE CAUSED BY PESTALOTIOPSIS PALMARUM (COOKE) STEY A. Karthikeyan; R. Bhaskaran
International Coconut Community Journal Vol 13 No 02 (1997): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v13i02.311

Abstract

Total and Ortho dihydroxy were more in younger coconut leaves as compared to the older leaves. Seven phenolic compounds were detected in younger leaves while the older leaves had only six phenolic compounds except chlorogenic acid Phenolic compounds inhibited the mycelial growth and Sporulation of P. palmarum. The quantity of sugars, starch and cellulose were lesser in younger leaves. Carbohydrates increased the mycelial growth and sporulation of the pathogen.
WATER RELATION, GAS EXCHANGE AND DRY MATTER PRODUCTION OF COCONUT (COCOS NUCIFERA, L.) UNDER UNIRRIGATED AND IRRIGATED CONDITIONS K.V. Kasturi Bai; V. Rajagopal; D. Balasimha; P. Gopalasudaram
International Coconut Community Journal Vol 13 No 02 (1997): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v13i02.312

Abstract

The response of local West Coast Tall (WCT) and the two hybrids viz., WCT x Chowghat Orange dwarf (COD) and COD x WCT to moisture availability in terms of water relation, gas exchange and dry matter (DM) production was studied. Discernible differences were noticed between the irrigation treatment (viz., irrigated vs unirrigated) with lower stomatal conductance and transpiration rate in the palms with out irrigation. Irrespective of the cultivar of hybrid leaf water potential was also significantly higher in irrigated palms. Net assimilation rate was lower under uniriigated condition. However genotypic or treatment differences were not significant. Annual DM production also vaned markedly between the irrigation treatments. Treatment differences were significant on the reproductive (RDM) rather then vegetative DM (VDM) production. Under the irrigation treatment the hybrids performed better than the local tall However the percentage reduction in the DM production was relatively less in the local WCT cultivar under unirrigated as compared with irrigated condition. The studies clearly highlighted the beneficial effects of irrigation on DM production and yield in coconut and the adaptability of the local WCT variety under limited water supply than the two hybrids.
BIOTYPICAL VARIABILITY AMONG FOUR POPULATIONS OF RED PALM WEEVIL RHYNCHOPHORUS FERRUGIAEUS FAB/OLIV. FROM DIFFERENT PARTS OF INDIA C.P. Ramachandran
International Coconut Community Journal Vol 14 No 01 (1998): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v14i01.313

Abstract

The red palm weevil rhpichophorus ferrugineus FAB/OLIV is a very serious and dreaded pest of coconut, date and other palms. Being an internal feeder the weevil incidence is detected at a very late stage when the tree has succumbed to weevil attack. Hence conventional control operations may not be very effective. The biotypical variability of the four populations collected from different parts of India showed that the populations are genetically different and strainal variability exists between them. Variations in sex ratio and deleterious genetic effect were observed in the crosses and reciprocal crosses. The weevil has a very high fitness due to high production potential and the absence of effective parasites, predators and pathogens. In spite of the high fitness, in endemic areas weevil population tend to remain at certain levels of intensity. This may be due to certain limiting factors.
ON THE COMMON ORIGIN OF SOUTHEAST ASIA OF PHYTOPLASMA ASSOCIATED DISEASES OF COCONUT Hugh C Harries
International Coconut Community Journal Vol 14 No 01 (1998): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v14i01.314

Abstract

The association of phytoplasma with two wilt diseases of coconut in Indonesia might be seen as a threat to the Asian and Pacific regions because epidemic phytoplasma diseases of coconut in America and Africa arc spreading out of control. Yet research has already suggested that these diseases originated in the Far East where resist varieties can bc found. Recently, a workshop was held to assess lethal diseases of coconuts caused by phytoplasmas and their importance in southeast Asia. The workshop took place in Manado, North Sulawesi , Indonesia on 16‑17 February 1998 and the full proceedings will be published separately. The participants beard about the situation of coconut development and the unpact of etiology of coconut wilt diseases in Indonesia. As 95% of coconuts in Indonesia are grown by small farmers the workshop was also informed of the impact of coconut diseases on small farmers. Specific reports were made on the history and status of Natuna wilt disease and the distribution of epiderniology of Kahmantan wilt diseasc. These have both been associated writh phytoplasma. Other reports were made on the development of coconut wilt discase in Kotawaringin, Timur District, Central Kalimantan Province and on the history and status of yellow disease of coconut palm in Central Sulawesi, for which no causal agents have yet been identified. Intemational representatives also spoke about root (wilt) and Tatipakka diseases of coconut in India and declffie diseases of coconut in Sri Lanka that have not been associated with phytoplasma and on lethal diseases in America and Africa that arc associated with phytoplasma. The history and biology of phytoplasmas as plant pathogens and diagnostic methods for coconut diseases; were explained in a session on the pathogen. Safe germplasm movernent for scientific purposes of conservation and exchange was dealt with and, for fanners and extension agents, the practical application of resistant local coconut varieties for replanting was advised.
STUDIES ON PESTS IN 4 COCONUT CULTIVARS IN LAMPUNG PROVINCE Wily A. Baringbing; Bariyah Baringbing
International Coconut Community Journal Vol 14 No 01 (1998): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v14i01.315

Abstract

A three‑year field study to investigate species of pests on four (4) coconut cultivars: PB‑1 21, PB‑111, KH17VA‑1 and dwarf Salak, was carried out in Lampung province involving 11 visits from November 1991 to April 1993. Only two regencies: Lampung Utara and Lampung Tengah with 3 and l sub‑districts, respectively were surveyed But only three sub‑districts of Lampung Utara: Sungkai Selatan, Manggala and Mesuji and only Terbanggi Besar in Lampung Tengah were studied Observations of Brontispa longissima Gestro, Plesispa reichei Chapuis, Oryctes rhinoceros Linnaeus, Xylotropus Gideon (Linnaeus), Rhynchophorus vulneratus (Panzer), and the others were studied. Results of the study showed that no cultivars were resistant to any species of pests in Lampung province. There were 19 species of pests, 2 of which do not belong to the insect present in the 2 regencies. The 17 species of insects belong to 4 orders including: Coleoptera, Lepidoptera, Homoptera and Orthoptera in 3, 5, 1 and l families, respectively.
THE PROBABLE ORIGIN OF LETHAL YELLOWING AND ITS CO¬-IDENTITY WITH OTHER LETHAL DISEASE OF COCONUT L. Chiarappa
International Coconut Community Journal Vol 14 No 01 (1998): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v14i01.316

Abstract

The working hypothesis is put forward that Lethal Yellowing (LY) disease of coconut originated in Southeast Asia, where the disease is now endemic due to the prevalence of locally resistant to moderately resistant varieties. The suggestion is made that LY is co‑identical with other lethal diseases of coconut characterized by different symptorn expression. These differences are due to certain morphological and physiological characteristics inherent in coconut 'groups' of different origin. A hypothesis is also advanced on the existence of different strains of LY, which would explain the differences in susceptibility of certain varieties when grown in different locations. The need for coordinated research to confirm or reject these hypotheses is discussed.
An Evaluation of Different Mulches Used in Soil Moisture Conservation of Coconut Lands Arachchi, L. P. Vidhana
International Coconut Community Journal Vol 14 No 2 (1998): CORD
Publisher : International Coconut Community

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37833/cord.v14i02.317

Abstract

An investigation on the ability ofdifferent types of mulches to conserve soil moisture and their effect on coconutpalm (Dwarfx Tall; CRIC 65) was carried out in Madampe soil series at Bandirripuwa Estate, Lunuwila located in agro ecological region of IL3 of Sri Lanka. Different types ofmulches compared in this study were dried coconut fronds and leaves, cover crop with Pueraria phasioloides and Brachiaria milliformis versus bare soil (Control). Soil moisture status was monitored using the neutron scattering technique. Leaf water potential of coconut with respect to different treatments was also monitored during dryperiod. Results showed that Brachiaria milliformis and Pueraria phasioloides extracted significantly (p<0.001) more waterfrom soils than diied mulch and the control. The amount of water extracted in the above treatments were 74.4Yo, 62.5Yo, 59.79yo and 61.3% respectively. However, the extraction was not significantly different when the rainfall was greater than 100 mm. About 33 mm of water retained in Brachiaria milliformis introduced soil profiles even by the end of dry period Water losses by Pueraria phasioloides grown plots, specially through evapotranspiration, were 1higher in initial stages of the dry period, but later stage losses were lower than that of Brachiaria due to defoliation of Pueraria leaves during severe dry period Leaf water potential of coconut with respect to stress conditions of different treatments revealed that Pueraria phasioloides and Brachiaria milliformis did not adversely affect coconut palm grown in Madampe series, although those live materials extracted more waterfrom soilprofile compared to the other treatments. In general, dry mulching wasfound to be the most efficient moisture conservative practice that can be adopted for coconut lands.

Page 34 of 39 | Total Record : 390

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