Browsing by Author "Moosa, H."
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Item Emerging trends in the management of bud rot disease of coconut(2004-12) Gunasekaran, M.; Moosa, H.; Rasmi, A.R.; Rohini Iyer; Sheenakumari, T.K.In recent times there has been a resurgence of bud rot incidence more or less everywhere in the coconut-growing zones. Though application of Bordeaux mixture is very effective, there are practical difficulties in its implementation. Thesc reasons necessitate the formulation of an alternative IDM strategy for bud rot management. For bud rot management to be effective, a sound forecasting model(s) is an essential one. Considering this, attempts were made to develop forecasting models, based on macro and micro temperature, relative humidity (in plains and hilly areas), and rate of survival of the inoculum in endemic areas during off-season. As an alternative to Bordeaux mixture, systemic fungicides were evaluated: Aureofungin - sol (36.4 g I palm)followed by Calixin (21 ml I palm) as stem injection was found effective. The protection offered against bud rot pathogenby these systemic chemicals extended up to 8 weeks, thus safeguarding the palms during vulnerable period. No residues could be detected in nut water and kernal up to six months after application in the case of Calixin. Hence, the systemics can be administered in advance, well before the onset of the monsoon and there is no need-to climb the tree since the chemical can be administered from the ground. An endophytic bacterium (Bacillus amyloliqriefaciens), a fungus (Trichodernia harzianurn) and botanicals (Andrographispaniculata and Lawsonia inerntis) were found very effective against F palmivora. As these botanicals are not compatible with the antagonist, Z harzianurn sequential application of botanicals and Z har:ianlim by maintaining a suitable interval between the applications is suggested. With the use of standardized ex viva varietal screening technique, a tall cultivar, Laccadive Ordinary (LO) and a dwarf cultivar. Ganga Bondam (GB) were identified as bud rot tolerant varieties. Formulating an IDM strategy combining all the above practices, viz., planting resistant / tolerant varieties, bud rot forecasting based on weather parameters. application of systemic fungicides as prophylactic and application of antagonists (bacterium and fungus) and botanicals for long term sustenance of disease suppression is discussed in this paper.Item Exploration and collection of coconut germplasm in Kadmat and Amini Islands of Lakshadweep, India(Springer, 2006) Samsudeen, K.; Jacob, P.M.; Niral, V.; Kumaran, P.M.; Radha Salooja; Moosa, H.Coconut, Cocos nucifera L. is an important plantation crop of the tropics. Lakshadweep group of islands in the Arabian Sea are considered to be home to some important coconut cultivars. The present exploration was planned to sample the variability within the population of Laccadive ordinary tall (LCT), Laccadive micro tall (LMT) from two islands, Amini and Kadmat, of Lakshadweep. Sampling was done from 24 sites in Amini and 13 sites in Kadmat. On an average 10 palms were sampled from each site. During the trip, five accessions of LCT, three of LMT and one of Kaithathali were collected. Eight fruit component measurements were recorded to study the variability in the population. Intra-population variability was observed in both LCT and LMT. Three forms of LCT belonging to niu kafa, niu vai and introgressed types could be identified. Elongated angular fruits (elliptical) with 70% husk were niu kafa types, round or oval shaped ones with 55% husk were niu vai types and pear shaped ones with 58% husk were the introgressed forms. This exploration trip unearthed the missing link of niu vai type in the form of round fruit type which has not been reported earlier. Identification of different groups in LCT has far reaching implications in breeding. In the production of hybrids involving LCT, selection of mother palms of LCT is crucial. It is suggested that the elliptical fruit types may be avoided in the production of commercial hybrids, since it has high percentage of husk.Item Prospects of Cultivating Dwarf Orange Coconut Cultivar for Tender Nut Production in Lakshadweep Islands(2004-03) Jacob, P.M.; Samsudeen, K.; Moosa, H.Item VA Mycorrhizal Status Of A Coconut Based High Density Multi-Species Cropping System(1991) Rohini Iyer; Moosa, H.; Kalpana SastryItem Vesicular Arbuscular Mycorrhizal Status In Relation To Drought Tolerance In Cocoa(1993) Rohini Iyer; Moosa, H.Vesicular - arbuscular mycorrhizal (VAM) status, characterized by per cent incidence, infection grading and spore density in root zone soils of five drought tolerant and an equal number of susceptible accessions of cocoa revealed that VAM incidence and infection grading in root samples and spore density in soil, was significantly higher in drought tolerant accessions when compared to drought susceptible accessions. With regard to the occurrence of VAM species, Glomus versiforme was encountered in higher frequencies and also in the rhizosphere of more number of plants belonging to the drought tolerant group.Item Vesicular-Arbuscular Mycorrhizal Association In Banana(1988-02) Rohini Iyer; Moosa, H.; Kalpana Sastry, R.Item Vesicular-Arbuscular Mycorrhizal Association in Banana(1988-02) Rohini Iyer; Moosa, H.; Kalpana Sastry, R.