Abstract
This study was carried out to relate infection and weight loss by #Botryodiplodia theobromae Pat, in #Colocasia esculenta L. corms with their phenol and/or calcium content. Corms were sourced
from two major root and tuber markets in Osiele and Kila, in Odeda Local
Government Area of Ogun State, Nigeria. The infection and weight loss
experiment was in CRD (complete randomized design), with two treatments
(the two markets) and seven replicates. Corms were inoculated with a
10-day old pure culture of B. theobromae and incubated for 10 days,
after which infection and weight was determined. The infected corms were
then analysed for phenol, calcium, nitrogen, phosphorus, potassium,
magnesium, iron and sulphur content. Corms from Kila had infection and
weight loss 41% and 37% respectively lower than corms from Osiele. Phenol and calcium content of the corms from Kila were 89.20 mg/100gdm
and 19.8 mg/100gdm respectively, significantly higher than those of the
Osiele corms which were 81.59 mg/100gdm and 18.9 mg/100gdm respectively.
High phenol with its #antimicrobial activity as well as higher calcium
conferring higher structural integrity against deterioration are adduced
as the reason for lower infection and weight loss in the corms from
Kila. The corms from Kila were also superior in terms of higher levels
of six other nutrient minerals namely N, P, K, Mg, Fe and S which were
1281, 28.59, 0.83, 3.80, 8.95 and 888.5 mg/100gdm respectively, compared
to 1249.5,27.93, 0.81,2.98,8.81 and 856 mg/100gdm in the Osiele corms.
Tuber quality for storage and improvement of declining yield of Colocasia esculenta varieties in Nigeria is recommended with #balanced mineral nutrition.
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