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Efforts made in present
investigation to evaluate the concentration of a few
commonly used fungicides for their comparative efficacy
against Phytophthora infestans (Mont.) de Bary- the
incited of late blight, with a view to select the most
effective fungicides for the disease management. Six
fungicides were selected among these, Sunoxanil 72 WP (Cymoxanil
8% + Mancozeb) showed the best result to prevent the late
blight before appearance of the disease (Prophylactic
measures) and Sunoxanil 72 WP (Cymoxanil 8% + Mancozeb) was
combined with Contaf 5EC (Hexaconazol 5%) showed the most
effective role to prevent the late blight after appearance
of disease (Curative measures). The highest 99.70% of
disease control and the highest yield (26.68 ton/ha) were
recorded on fungicides containing 3.5mg/L Sunoxanil 72 WP (Cymoxanil
8% + Mancozeb 64%) with 3.0ml/L Contaf 5EC (Hexaconazol 5%)
during 2015-2016. It was concluded that Sunoxanil 72 WP (Cymoxanil
8%+ Mancozeb 64%) acted as the best fungicide when applied
as prophylactic measures. Sunoxanil 72 WP (Cymoxanil 8%+
Mancozeb 64%) was combined with Contaf 5EC (Hexaconazol 5%)
showed the best result when applied as curative measures.
The lowest 75.68 % of disease control and the lowest yield
(15.67 ton/ha) were recorded on fungicides containing 2.0
mg/L Ridomil MZ 72 (Metalaxyl 8%+Mancozeb 64%) with 1.0 ml/L
Autostin 50 WDG (Carbondaxim 50%) during 2014-2015. On the
other hands when Actiphose was used with Mancozeb (Indrofil
M-45) showed comparatively better performance. Plant growth
was gradually prohibited for application of Carbondaxim
along with the yield was gradually decreased.
Keywords: Potato, late blight, Management, Hexaconazole,
Mancozeb, Sunoxanil 72 WP, Autostin50 WDG, Actiphose,
Ridomil MZ 72, Disease index, Disease control.
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