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Sudan Journal of Agricultural Research
Evaluation of hot peppers (Capsicum annuum I.) local germ plasm for
powdery mildew (Leveillula taurica (lev.) am.) resistance in the Sudan
A.E. Ahmedl, A.E. Eljack2, M.E. Suliman2 and Y.F. Mohamed2.
Abstract:
Powdery mildew is a serious disease of pepper causing leaf shedding and
resulting in low yield and poor quality of produce. Thirty-six accessions of
local hot pepper (Capsicum annuum L.) were evaluated for resistance to
powdery mildew (Leveillula taurica). Evaluation was performed under natural
infection conditions in two locations (Nesheshiba and Abu Haraz). A disease
severity scale of 1 to 9 was used, where 1 at one end indicating extreme
susceptibility and 9 at the other end indicating high resistance. Evaluation
of the accessions was done twice, first when plants were three months old
and second one month later. Disease severity appeared to be similar in both
locations as indicated by the susceptible checks, which were heavily
infected in both cases. Plants within accessions showed different reactions
to the disease indicating genetic variability. The mean of the first rating
was higher than
that of the second rating, suggesting deterioration of resistance in some
plants towards maturity. Thus, selection for resistace should always be
delayed towards later stages of plant maturity. Few plants with powdery
mildew resistance (PMR > 7 ) appeared in some accessions in the second
rating. Highly susceptible plants with PMR = 1 were selected to produce
susceptible inbred lines to be used as susceptible cheks and for the study
of the disease epidemiology. Also, some plants showed susceptibility to the
disease, but with marked reduction in leaf shedding, a phenomenon that
requires further investigation.
Keywords:
Sudan Journal of Agricultural Research Vol. 1(1998) PP. 53-55
