TITLE:
Effect of Varieties and Fungicide Rate on Chocolate Spot (Botrytis fabae) Disease of Faba Bean (Vicia faba L.) at Tach Gayint District in South Gondar Zone, Amhara Region, Ethiopia
AUTHORS:
Merkuz Abera, Meseret Semagn
KEYWORDS:
AUDPC, Botrytis fabae, Mancozeb, Disease Severity, Vicia faba, Variety
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.13 No.5,
May
19,
2022
ABSTRACT: Faba bean is suffered
with many biotic and abiotic factors. Chocolate spot disease, caused by Botrytis
fabae is one of the biotic factors limiting yields of this crop resulting
in yield losses up to 68% in Ethiopia. The experiment was conducted during 2020/2021
cropping season at Tach Gayint district, Ethiopia to determine the integration
of faba bean varieties and fungicide rates on reducing chocolate spot disease. The experiment consisted
of 12 treatments, viz. three faba bean varieties and four rate
of Mancozeb fungicide in
factorial arrangement. The experiment was laid out as randomized complete block
design (RCBD) with three replications. Data was
collected and analyzed. Results indicated that, disease incidence was
reached at maximum percentage in all treatments on the last dates of
assessment. But treatments were significantly difference in severity level. The least disease severity was recorded from varieties treated by 3.5 kg/ha of Mancozeb 80% WP with mean values Walki
(12.7%), and (18.1% and 20.8%) on Gora and local variety respectively at the
final dates of disease assessment. Similarly,
the reduced AUDPC was also recorded from varieties treated by 3.5 kg/ha of Mancozeb 80% WP with mean values Walki
(371.8% unit/day) and (539% and
686.4% days) on varieties Gora, and Local respectively. Whereas the maximum
disease severity and AUDPC were obtained from unsprayed plots. Based on the
results obtained, variety Walki treated with Mancozeb 80% WP at rate of 2.5 kg/ha and 3.5 kg/ha were effective to reduce the effect of chocolate spot disease for
the study area.