Bio-efficacy evaluation of Serenade AS® (QST 713 dried strain of Bacillus subtilis) as postharvest treatment in Cavendish banana

L. Trueggelmann, S.M. Chavez, B. Escamillan, F.A. Rizal
Crown mold and crown rot are diseases caused by several fungi, commonly in complex (Colletotrichum musae, Ceratocystis paradoxa, Fusarium pallidoroseum, Lasiodiplodia theobromae, among others). The replacement of chemical fungicides with biorational treatments is a top priority for banana producing/exporting companies. Hence, the efficacy of the bio-fungicide Serenade AS® as a postharvest treatment in Cavendish banana was studied against postharvest diseases. An in-vitro study using treatments T1 (untreated control), T2 (standard control Iprodione at 3 mL L-1), T3 (Serenade at 5 mL L-1), T4 (Serenade at 10 mL L-1), T5 (Serenade at 15 mL L-1) and T6 (Serenade at 20 mL L-1) was repeated twice. Results showed that application of Serenade AS at higher rates (T5, Serenade at 15 mL L-1, and T6, Serenade at 20 mL L-1) significantly reduced growth of the target pathogens after 7 days of seeding in vitro. Additionally, a shipment simulation study was conducted over 13 days with Cavendish 'Williams' banana from two different locations and divided into the following set-ups: (a) using different rates of Serenade: T1 (untreated control), T2 (chemical control, Iprodione at 3 mL L-1), T3 (Serenade spray at 5 mL L-1 then alum spray), T4 (Serenade spray at 10 mL L-1 then alum spray), T5 (Serenade spray at 15 mL L-1 then alum spray), and T6 (Serenade spray at 20 mL L-1 then alum spray) and (b) different modes/sequences of Serenade application: T1 (untreated control), T2 (chemical control, Iprodione at 3 mL L-1 as spray), T3 (fruits dipped in Serenade at 15 mL L-1 then alum spray), T4 (Serenade spray at 15 mL L-1 without alum), and T5 (alum spray then Serenade spray at 15 mL L-1). In these studies, the application of Serenade at higher rates performed better than the untreated control. Rates of 15-20 mL L-1 reduced the incidence of crown mold and crown rot on fruit, especially in a manner in which Serenade was sprayed first followed by alum.
Trueggelmann, L., Chavez, S.M., Escamillan, B. and Rizal, F.A. (2017). Bio-efficacy evaluation of Serenade AS® (QST 713 dried strain of Bacillus subtilis) as postharvest treatment in Cavendish banana. Acta Hortic. 1179, 125-132
DOI: 10.17660/ActaHortic.2017.1179.19
https://doi.org/10.17660/ActaHortic.2017.1179.19
crown mold, crown rot, Musa AAA 'Williams', bio-fungicide, in vitro, shipment simulation
English

Acta Horticulturae