TITLE:
Efficacy of Some Botanical Extracts on the Control of Late Blight Disease in Experimental Potato Field
AUTHORS:
Shafiqul Islam, Md. Abul Kalam Azad, Md. Rashidul Islam, Mst. Samia Sultana, Jesmin Ara Khatun, Md. Huzzatul Islam
KEYWORDS:
Botanical Extract, Late Blight Disease, Potato, Phytophthora infestans, Experimental Field
JOURNAL NAME:
Advances in Bioscience and Biotechnology,
Vol.12 No.12,
December
13,
2021
ABSTRACT: Late blight caused by Phytophthora infestans (Mont.) De Bary is
the most devastating disease of potato. This study was carried out to evaluate
the efficacy of ten botanical extracts against the late blight disease
incidence and severity in experimental potato field at University of Rajshahi,
Bangladesh during 2019-2020. Crude aqueous extract of leaves of Syzygium cumini, Psidium guajava, Eucalyptus globusus, Carica papaya and Lawsonia inermis; fruits of Terminalia bellirica, T. chebula and Piper nigrum; flower buds of Syzygium aromaticum and cloves of Allium sativum were used at 5% (w/v)
concentration for evaluation. Out of ten botanicals, Syzygium cumini leaves extract was
found most effective in controlling the late blight disease incidence and
severity up to 66 DAS (days after sowing) and increased the potato yield by
71.29% compare to untreated control. The efficacy of Lawsonia inermis extract against late
blight disease was found promising and increased the potato yield by 48.51%. Other
four botanical extracts (Terminalia chebula, Piper nigrum, Syzygium aromaticum and Carica papaya)
showed moderate efficacy against the
incidence and severity of late blight disease, and increased 30% more
potato yield compare to control. These results suggest that botanical extract
of Syzygium cumini has a great potential as an alternative of chemical
fungicides to control the late blight disease of potato in eco-friendly
way.