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STUDIES ON SOME ASPECTS OF SCLEROTIAL WILT AND FUSARIUM DECLINE DISEASE OF BETELVINE IN PONNUR AREA OF GUNTUR DISTRICT OF ANDHRA PRADESH

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Title STUDIES ON SOME ASPECTS OF SCLEROTIAL WILT AND FUSARIUM DECLINE DISEASE OF BETELVINE IN PONNUR AREA OF GUNTUR DISTRICT OF ANDHRA PRADESH
 
Creator PARVATHI DEVI, G
 
Contributor SITARAMAIAH, K
 
Subject STUDIES, SCLEROTIAL, WILT, FUSARIUM, DECLINE, DISEASE, BETELVINE, PONNUR, GUNTUR, ANDHRA PRADESH
 
Description Sclerotia! wilt fungus Sclerotium rolfsii Sacc. and
Fusarium decline disease fungus Fusarium solani (Mart).Sacc.
were ·isolated in pure culture from diseased betelvine plants
in Ponnur betelvine growing gardens. Pathogenicity tests
with S.rolfsii had revealed that soil substitution method was
effective in proving pathogenicity. However, introduction of
inoculum through plastic tubes inserted at the time of
planting was also effective, but the manifestation of wilt
symptoms was delayed. Pathogenicity tests conducted with
.F.. .solani indicated that immersing the clipped roots in
!•solani inoculum for 24 h was very effective in p~oducing
typical Fusarium wilt symptoms in soil and in hydroponics,
similar to those observed under field conditions.
Field survey of second year betelvine gardens (both in
apparently healthy as well as Fusarium decline diseased
gardens) was conducted in Po~nur betelvr.ne gardens, Guntur
district (A.P) at 9 days interval, to correlate the per cent
change in decline disease incidence with physical,
and chemical properties of soil. The per cent
decline disease incidence could be correlated with
content of soil samples in the diseased ga~dens.
bilogical
change in
magnesium
As the
magnesium content increased, the per cent change in decline
disease incidence increased. Higher number of soil
microflora (total fungi, total bacteria, total actinomycetes)
are observed in diseased gardens and could be correlated with
per cent change in decline disease incidence. As the soil
microflora increased, the per cent change in decline disease
incidence increased. The population of root-knot nematode
Meloidogyne incognita was correlated with per cent change in
decline disease incidence in diseased gardens. As the
~ •. incognita population increased, the per cent change in
decline disease incidence increased.
Interaction studies in pot culture experiments with
M.incognita alone and in combination with s.rolfsii at
different inoculum levels, indicated that maximum reduction
in fresh shoot and root weight, dry shoot and root ~eight,
shoot and root length was observed when the plants were
inoculated with 4000 2nd stage juveniles of M.incognita &
S.rolfsii simultaneously.
Trichoderma harzianum was a potent antagonistic fungus
.~gainst -S.rolfsii and -F.solani. This antagonistic fungus
can be used in field plots to control S.rolfsii or F.solani.
Thirteen betelvine cultivars collected from different
states were tested for their resistance against S.rolfsii in
pot culture. Cultivar "Karapaku" from Andhra Pradesh
recorded 80% sclerotial infection. The cultivars Bangla
Penna patna (Orissa), Tellaku (Ponnur-R) (Andhra Pradesh),
Tellaku (Ponnur-S)· (Andhra Pradesh), Gachipan (Assam), Maghi
(Bihar) and Kapoori (Bihar) gave 90% infection. However the
remaining cultivars; Meetha cum Bangla (Uttar Pradesh),
Bangla Desi (Uttar Pradesh), Bangla Nagaram (Uttar Pradesh),
Kakair (Bihar), Godibangla (Ori'ssa) and Bangla (Madhya
Pradesh) recorded 100% infection.
 
Date 2016-08-18T11:05:33Z
2016-08-18T11:05:33Z
1989
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72881
 
Language en
 
Relation D3396;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD.