Integrated Management of Chrysanthemum Wilt Caused by Fusarium oxysporum f. sp. chrysanthemi (Litt., Armst. and Armst.)
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Date
2024
Authors
Santosh Kumar
Journal Title
Journal ISSN
Volume Title
Publisher
MPUAT, Udaipur
Abstract
The present study “Integrated management of chrysanthemum wilt caused by
Fusarium oxysporum f. sp. chrysanthemi (Litt., Armst. and Armst.)” were taken on the
various aspects viz., isolation, identification, pathogenicity test, in vitro and in vivo
evaluation of fungicides, bio-agents and de-oiled cakes for management of
chrysanthemum wilt and screening of different varieties of chrysanthemum against for
source of resistance.
The pathogen was isolated from root tissue of wilted chrysanthemum plant in
the laboratory. Morphologically culture growth was fluffy with regular margin and
colony was dull white to peach colour culture colony and the fungus produced micro
conidia, macro conidia and chlamydospores. Micro-conidia were abundant, hyaline,
continuous or single septate, ovoid to ovate in shape. Macro-conidia were sickle
shaped, curved with 3-septate or rarely 4-5 septate. Chlamydospores were hyaline,
usually vacuolated, spherical mostly found in chain. Based on cultural and
morphological culture characteristics pathogen was identified as Fusarium oxysporum
f. sp. chrysanthemi.
The pathogenicity of Fusarium oxysporum f. sp. chrysanthemi was carried on
susceptible variety “Pusa Anmol” with sick soil method. In early stage of disease plant
produced symptoms of drooping, yellowing and loss of turgidity of leaves. At sever
stage of disease, the stem and root portion showed internal brown to necrotic brown
discoloration and blocking of vascular tissues.
Ten varieties were screened under natural sick soil condition against fusarium
wilt of chrysanthemum. Among them variety “Rose Pink” was found resistant with
minimum 10.00 per cent wilt incidence and “Yellow Button” was found moderately
resistant with 18.89% wilt incidence Seven fungicides were tested for their efficacy against Fusarium oxysporum f.
sp. chrysanthemi at 250, 500, 750 and 1000 ppm concentration in laboratory.
Tebuconazole 50% + trifloxystrobin 25% WG was found most effective with 90.56,
92.50, 100.00 and 100.00% inhibition of mycelial growth of fungus at 250, 500, 750
and 1000 ppm.
Among the de-oiled cakes neem cake was found most effective with 37.50,
51.39, 64.17 and 81.94% mycelial growth inhibition at 5, 10, 15 and 20 per cent
concentration while Trichoderma viride was superior compare to all other tested bioagents
with 63.61% growth inhibition of pathogen.
Eight different treatments were evaluated for integrated management of
chrysanthemum wilt under pot culture. Treatment rooted cuttings treated with
tebuconazole 50% +trifloxystrobin 25% WG @0.075% + soil drenching with
tebuconazole 50% +trifloxystrobin 25% WG @0.075% after 15 day of transplanting
was found most effective with maximum 100% wilt control
Description
Keywords
Citation
Kumar S. and Bunker R. N.