Impact of the Biological and Chemical Control of White Rot on Green Bean Productivity

Abstract

(Received 19/07/2020, accepted 22/02/2021) DOI: 10.21608/ejoh.2020.36149.1136 ©2021National Information and Documentation Centre (NIDOC) THE experiments were conducted on the autumn and winter of 2016 /2017 and 2017/2018 seasons at KafrAlzayaat area in EL-Gharbia, Egypt. The main objective of this study determines the efficacy of several biological and chemical controls on the growth and productivity of green bean crop and the management of white rot disease caused by Sclerotiniasclerotiorum. Five biological control treatments,namely Trichodermaasperellum(85 g/100L-1), Bacillus megaterium(250 g/100L-1), Trichoderma album (250 g/100L-1), Chitosan (200 g/100L-1), and Hydrogen peroxidase (250 g/100L-1) were applied and compared with three fungicides, namely Flutolanil (100 g/100L-1), Tebuconazole with Fluopyram (50 ml/100L-1) and Tebuconazole (188 ml/100L-1 ) as well as control treatment for their ability in increasing green bean crop productivity and reducing disease severity and incidence growth of white rot by spraying two times on plants; at 35-45 days after emergence or 59-61 BBCH stages (BiologischeBundesanstalt, Bundessortenamt und CHemischeIndustrie) using knapsack sprayer at 300 L./Feddan. Results indicated that Tebuconazole with Fluopyram applications significantly gave the highest indications of total and marketable yield compared with the other experimental treatments in both seasons. Moreover, the two times of spraying by Tebuconazole with Fluopyram, and Hydrogen peroxidase treatments had significantly lowered disease incidence and disease severity and increasing control efficiency in both seasons. Furthermore, other treatments like T. asperellum, Tebuconazole or Flutolanil had a moderate efficacy on green bean crop productivity, disease severity and incidence of white rot compared to the control treatment. Finally, the control treatment was the lowest values of crop productivity and disease efficacy.