PG Thesis
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Item Organic strategy for the management of sheath blight disease of rice(Department of Plant Pathology, College of Agriculture, Vellayani, 2017) Karthika, S R; Sajeena, AItem Epidemiology and control of sheath rot disease of rice(Department of Plant Pathology, College of Agriculture, Vellayani, 1986) Krishnakumaran Nair, B; Chandrasekharan Nair, MStudies on symptomatology, epidemiology and control aspects of sheath rot disease of rice caused by Serocladium oryzae Cams & Hawksworth (= Acrocylindrium oryzae Saw.) were done in detail. The disease initiated as purplish-brown oblong lesions on the sheath of the flag leaf. At maturity lesions enlarged in size with grey -white centres and often covered the entire flag leaf sheath. Panicle often did not emerge but choked inside the affected sheaf itself. Artificial inoculation studies showed that under sufficient humid conditions the pathogen took an average five to eight days for initiation and 15 to 20 days for the complete development of the disease in rice plants. The pathogen was isolated from four naturally infected rice varieties, collected from three different culture (isolates viz., S1, S2, S3, S4, S5, S6 & S7) were selected based mainly on symptomatological variations and their comperative morphological characters were studied in detail. No appreciable differences were noticed in the morphological characters between isolates.Item Symptomatology etiology and control of sheath rot disease of rice caused by Acrocylindrium oryzae(Department of Plant Pathology, College of Agriculture, Vellayani, 1981) Balakrishnan, B; Chandrasekharan Nair, MSheath rot disease of rice caused by Acrocylindrium oryzae was investigated. The fungus was found to infect rice plants at boot leaf stage. The leaf sheath covering the panicle was found to be comparatively more susceptible to the fungus than the sheath of other leaves. Severe infection caused choising of the whole penicle insids the sheath itself before emergence. The pathogen was isolated from infected tissues of host plants and brought into pure culture. Comparative studies of air isolates of Acrocylindrium oryzae from four rice varieties and two weed hosts did not show much appreciable difference in their morphological characters except light variations in the hyphal thickness and smaller conidial size from those on weed hosts.Item Triazole,strobilurin and its combination fungicides for the management of anthracnose and fruit rot of chilli(Department of Plant Pathology, College of Agriculture, Vellayani, 2018) Anjana, R S; Joy, MItem Etiology of honey bee brood disease in Southern Kerala(Department of Agricultural Entomology, College of Agriculture, Vellayani, 2018) Jyothis, P Joseph; Amritha, V SItem Integrated management of alternaria leaf spot of cabbage (Brassica oleracea var. capitata (L.))(Department of Plant Pathology, College of Agriculture, Vellayani, 2018) Madhu Kiran Gunda, V N S; Susha S TharaItem Response of selected okra [Abelmoschus esculentus (L.) Moench] cultivars to root knot nematode meloidogyne incognita (Kofoid and White)(Department of Agricultural Entomology, College of Horticulture, Vellanikkara, 2017) Chandini, S M; Susannamma KurienItem Cataloguing, documentation and management of fungal diseases of strawberry (Fragaria x ananassa Duch.)(Department of Plant Pathology, College of Horticulture, Vellanikkara, 2017) Amrutha, P; Reshmy VijayaraghavanItem Characterization and management of fungal pathogens of cabbage (Brassica oleracea var. capitata L.) and cauliflower (Brassica oleracea var. botrytis L)(Department of Plant Pathology, College of Horticulture, Vellanikkara, 2017) Nusrath Beegum, C H; Yamini Varma, C KItem Bioecology and management of root-knot nematode Meloidogyne incognita chitwood in kacholam Kaempferia galanga Linn(Department of Entomology, College of Agriculture, Vellayani, 1998) Rajani, T S; Sheela, M SThe biology of root-knot nematode of kachlolam, its histopathological effects on roots and the effect of soil type on the pathogenicity of M. incognito infesting kacholam were studied under pot culture conditions. The effect of soil moisture and pH on the hatching of eggs and survival of larvae were studied in vitro in micro pots. Field trials were carried out to assess the crop loss and to find out a suitable management strategy for the root-knot nematode infesting kacholam. The root-knot nematode, Miincognita took 37 days for the completion of one life cycle in kacholam plants at room temperature of 27 + or - 3 0 C and the mean number of eggs observed per egg mass was 130. In kacholam roots, the nematode mainly infests the xylem vessels. The giant cells were quadrangular in shape and three in number and were observed adjacent to the head of the nematode. Field capacity was the most favourable soil moisture level for the hatching of eggs and survival of larvae of M.incognita. There weas no statistically significant variation in the hatching of eggs and survival of larvae under different soil pH levels ranging from 5 to 7.5. Sandy soil (Entisol) was found to be the best soil type for the multiplication of M. incognita infesting kacholam roots. The biometric characters and yield were reduced with the increase in inoculum levels and a maximum reduction was noticed at 10,000 12 level in all soil types under pot culture conditions. At field conditions, inoculation of 1000 12 per plant resulted in the reduction of number of leaves, rhizome length, root weight and yield per plant and per plot yield to the tune of 43.33,23.71,46.26,63.69 and 43.46 per cent respectively over control plants. Neem cake 200 g/m2, V AM (Glomus fasciculatumy 300 g/m2 inoculum per plant and cabofuran 3.33 g/ m2 were found effective for the management of root-knot nematode, M. incognita infesting kacholam.But neem cake treatment was found to be the best in reducing the soil and root population of nematodes and increasing the plant growth characters (number of leaves, length of rhizome and weight of roots) and yield (rhizome weight per plant and per plot) of kacholam.