STUDIES ON CASTOR (Ricinus communis L.) WILT COMPLEX AND ITS MANAGEMENT
KrishiKosh
View Archive InfoField | Value | |
Title |
STUDIES ON CASTOR (Ricinus communis L.) WILT COMPLEX AND ITS MANAGEMENT
|
|
Creator |
SHALINI, Y
|
|
Contributor |
VIDYA SAGAR, B
|
|
Subject |
diseases, fungi, planting, sowing, castor (genus), vegetative propagation, application methods, biological development, genotypes, pathogens
|
|
Description |
Castor (Ricinus communis L.) is an important non-edible oilseed crop and plays a vital role in Indian vegetable oil economy. The crop is extensively grown in Mahaboobnager, Rangareddy, Nalgonda and Kurnool districts of Andhra Pradesh. Interaction studies on Fusarium oxysporum f. sp. ricini and Rotylenchulus reniformis in wilt resistant genotypes DCH-177 revealed that the presence of nematode predisposes to Fusarium wilt. The maximum wilt incidence of 83.66 was recorded when nematode inoculated prior to fungus in wilt resistant genotype DCH-177, while susceptible genotype JI-35 recorded wilt incidence of 100 per cent. The population of Fusarium, nematode and egg masses was also high in DCH-177 with 30.66, 1783 and 16.00 respectively in nematode inoculated prior to fungus. Similar increase was also recorded in susceptible genotype JI-35. Screening of seven castor genotypes for their reaction in presence of nematode and fungus revealed that, the genotype DCH-519 recorded low wilt incidence of 47 per cent under sick soil, while under artificial condition the per cent wilt incidence was 59. Among the wilt resistant hybrids tested with Fusarium and reniform nematode it was found that DCH-177, GCH-4 and GCH-7 became susceptible in presence of reniform nematode under both sick and artificial inoculation condition, whereas wilt resistant hybrid DCH-519 and cultivar 48-1 were less effected by wilt in presence of reniform nematode. Histopathological studies of nematode susceptible cultivar 48-1 revealed that nematode feeding cells with hypertrophy, granular cytoplasm and thickened cell wall with uninucleate syncytia, where as in resistant cultivar JC-12 penetration of nematode into cortical cells was observed but syncytial development has not occured. Distortion of the xylem parenchyma cells with fungal mycelium was observed in wilt susceptible genotype VP-1, whereas the vascular bundles were intact with scanty mycelial growth in wilt resistant genotype 48-1. In vitro evaluation of fungal and bacterial biocontrol agents against test fungus F. oxysporum f. sp. ricini, indicated, the superiority of Trichoderma viride (Trichogen-T) and Pseudomonas fluorescens (Florozen-P) over other bioagents by recording 100 and 85.69 per cent inhibition respectively. Among the five fungicides tested by poisoned food technique carbendazim was found superior at both recommended and half-recommended doses with 100 per cent inhibition of the test pathogen, whereas among botanicals, neem oil was found effective with 94.37 per cent at 10 per cent concentration. The experiment on management of wilt-nematode complex in hybrid GCH-4 revealed that the treatment T. viride @ 4gkg-1 seed + P. fluorescens @ 10gkg-1 seed (T7) was recorded less wilt incidence (31) and high per cent germination 95 per cent. The Fusarium, nematode and root egg mass population were also low with 8.33 x 103, 263.88 / 200 cc soil and 7.00 / root system in the treatment T7 respectively. The increased growth parameters shoot length (29 cm), root length (43 cm) and shoot dry weight (11 g) and root dry weight (7 g) was also recorded high in the treatment T7 |
|
Date |
2016-06-22T15:09:37Z
2016-06-22T15:09:37Z 2013 |
|
Type |
Thesis
|
|
Identifier |
http://krishikosh.egranth.ac.in/handle/1/67745
|
|
Language |
en
|
|
Relation |
D9436;
|
|
Format |
application/pdf
|
|
Publisher |
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
|
|