Abstract:
In vitro antifungal potential
of Trichoderma isolates, selective botanical
extracts and fungicides against A. solani
was evaluated. Trichoderma isolates, i.e.
T. harzianum, T. viride and T. hamatum,
were tested for their antifungal effect by
dual culture technique at 48, 96, 144 and
172 hrs. T. hamatum produced the highest
inhibition of A. solani in vitro, followed by
T. hazianum and T. viride after 172 hrs.
Methanolic leaf extracts of Elettaria
cardamomum, Syzygium aromaticum,
Curcuma longa and root extract of
Parthenium hysterophorus showed up to
100% inhibition of A. solani, compared to
control, while methanolic stem and leaf
extracts of P. hysterophorus produced up to
90% inhibition of the pathogen. In vitro, six
different systemic fungicides Triger 25%
EC (Tebuconazole), Solex (Carbendazim
40% + Triadimefon 10%), Dew
(Difenoconazole), Amistor Top SC
(Azoxystrobin + Difenoconazole), Corel
25% EC (Difenoconazole), Reflex
(Difenoconazole + Propiconazole) were
tested against A. solani at 5, 10 and 15 ppm
concentrations after 48, 96, 144 and 172 hrs.
Corel and reflex at all concentrations
produced best growth inhibition of
A. solani. The inhibition was maximum by
all fungicides at 15 ppm after 172 hrs. All
fungicides had a promising inhibitory effect
on A. solani, except Solex. It can be
concluded from the present investigation
that a combination of these strategies can be
used in integrated disease management of
A. solani on potato.
