Record Details

STUDIES ON CASTOR (Ricinus communis L.) WILT COMPLEX AND ITS MANAGEMENT

KrishiKosh

View Archive Info
 
 
Field 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