Effects of Biopesticide Bacilius Subtilis Qst 713 and Azotobacter Chroococum +Azotobacter Vinelandii Applications on The Table Grape Quality During The Storage Period

Gray mold, the most important postharvest disease of table grapes, iscontrolled by SO_2. But, SO_2 treatment might be dangerous to people. Thus, this study was conducted to prevent quality loss during storage period of table cv. Ekşi Kara by pre-harvest (24 hours prior to harvest) Bacillus subtilis (Bs), and Azotobacter chroococum + Azotobacter vinelandii (Ac + Av) in Bs 15 ml L^-1, Bs 30 ml L^-1, Ac + Av 10 ml L^-1, Ac + Av 20 ml L^-1 in the producer vineyard. The clusters were transported to storage room (0±1 °C, 85% RH) and put into 500 g paskes. SO_2 pad generator and untreated samples utilized as controls. Weight loss (WL), berry and rachis color L, C, h° values, °Brix (%), pH, titratable acidity (TA) in must, maturity index (MI), berry cracking resistance [(CR) (kg)], tensile strength (TS), appearance (0-4 scale), taste (0-4 scale), rachis browning [(RB) (0-4 scale)], decay rate [(DR) (%)] were analyzed. WL at the 75th days of storage period by Bs 15 ml L^-1, Bs 30 ml L^-1 and Control were 2.63%, 2.63%, 3.93% respectively. Least WL was detected at SO_2 3.28% at 105th days of storage. Bs 15 ml L^-1, Bs 30 ml L^-1, Ac+Av 10 ml L^-1, Ac+Av 20 ml L^-1, and SO_2 applications were found effective on certain quality criteria. Bs 15 ml L^-1, stands out in terms of prevention of berry C value, °Brix, RB, TS, CR, taste and appearance; Bs 30 ml L^-1, berry C value, °Brix, taste, appearance, pH, MI and DR, and Ac+Av 10 ml L^-1, WL, RB, and Ac+Av 20 ml L^-1, WL, °Brix, pH, appearance, RB values. SO_2, WL, pH and appearance, TA and DR. Bs and Ac + Av may be an alternative to SO_2 especially for the short-term table grape preservation. Bs 30 ml L^-1 and Bs 15 ml L^-1 for 2 months or longer table grapes storage to be an alternative to SO2 application together in the quality retention as well as residues problem.