STUDIES ON RHIZOME ROT OF GINGER WITH SPECIAL REFERENCE TO MAJOR FUNGAL PATHOGENS
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Date
2019-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR – 584 104
Abstract
Rhizome rot complex was the major constraint of ginger production. The maximum
incidence of 32.97 per cent was recorded in Uttara Kannada and least in Belgaum (12.25 %).
Average severity of rhizome rot of ginger in surveyed districts of Northern Karnataka was
22.51 per cent. Oat meal agar (89.98 mm) and Potato dextrose agar (89.19 mm) supported the
maximum radial growth of P. aphanidermatum and F. oxysporum f. sp. zingiberi
respectively, with higher sporulation. In P. aphanidermatum, maximum mycelial growth was
recorded (89.47 mm) at temperature 30 °C and in case of F. oxysporum f. sp. zingiberi at
25 °C (90.00 mm). The temperature range 25 and 30 °C was optimum for the growth of both
fungal pathogens. With respect to different pH levels, maximum mycelial growth and
sporulation were observed at pH 7.0 in P. aphanidermatum (87.50 mm) and in F. oxysporum
f. sp. zingiberi (86.17 mm). The optimum pH for growth of both pathogens was 7 followed
by 6.5. With respect to illumination the treatment with continues light was good for growth
and sporulation of both fungal pathogens. Humnabad local variety showed some resistant to
disease and it could postpone disease incidence upto 95 days after planting. Among the non
systemic fungicides evaluated mancozeb showed complete inhibition in both pathogens,
among systemic fungicides tested carbendazim showed maximum inhibition in
P. aphanidermatum while in case of F. oxysporum f. sp. zingiberi both carbendazim and
carboxin showed cent per cent inhibition. In combi fungicides Carbendazim 12% +
Mancozeb 63% WP showed maximum inhibition in both pathogens. Among different bio
agents tested, Trichoderma harzianum (Th-4) inhibited maximum mycelia growth of 70.40
per cent in P. aphanidermatum and 71.37 per cent in F. oxysporum f. sp. zingiberi
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