TITLE:
Different Plant Extracts against Phytophthora infestans (Mont.) de Bary in Tomato in Vitro
AUTHORS:
Rachel I. Ndala, Ernest Rashid Mbega, Patrick A. Ndakidemi
KEYWORDS:
Tomato, Late Blight Disease, Plant Extracts, Inhitionpercentage
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.10 No.4,
April
30,
2019
ABSTRACT: The objective of this study
was to evaluate the efficacy of plant extracts in managing late blight disease
in tomato, in vitro. Crude extracts
were from Plectranthus barbatus, Tephrosia vogelii, Sphaeranthus suaveolens and Lantana
camara. These were compared with
commercial formulations Otiva fungicide and untreated as negative control. Their effectiveness was determined by measuring the inhibition zone
of the mycelial growth of the pathogen recorded
in triplicate at 48 hours and 72 hours. The results showed significant
differences (P ≤ 0.001) among the extracting solvents on percentage inhibition
of Phytophthora infestans. Methanol
was superior in inhibiting the growth of mycelial growth of P. infestans as compared with ethyl acetate. Furthermore, all plants tested showed
antifungal activity against P. infestans. The P. barbatus, L. camara and S. suaveolens were comparable with the commercial fungicide in inhibiting the growth
of P. infestans.
In this study, T. vogelii extract showed poor results in inhibiting the mycelial
growth of P. infestans as compared with other plant extracts. Also, it was
observed that, there were significant (P