BIOLOGICAL CONTROL OF CORE-ROT CAUSED BY ALTERNARIA ALTERNATA ON STARKING DELICIOUS APPLES
N TEIXIDO1, M NOGUERAS2, J MUNOZ2, J USALL1 and I VINAS 1
1Postharvest Unit, CERTA, Centre UDL-IRTA, 177 Rovira Roure Ave., 25198 Lleida, Catalunya, Spain: 2Dept of Food Technology. UdL, 177 Rovira Roure Ave., 25198-Lieida, Cataiunya, Spain
Bakground and objectives
Biological control using microbial antagonists has been considered a desirable alternative to the use of chemicals to control diseases. The aim of the present study was to look for an effective antagonistic agent to control core-rot caused by Alternaria alternata on Starking Delicious apples.
Material and methods
Results and conclusions
In laboratory assays, control of core lesion diameter by P. syringae was 96 and 73% at 4.103 cfu/ml and 104 cfu/ml Alternaria concentrations, respectively, in artificially inoculated apples.
Field experiments demonstrated that P. syringae reduced the incidence of Alternaria rot when artificially inoculated in field conditions and after 4 months in cold storage. A study of the population dynamics showed that the biocontrol agent could grow effectively in the apple core.
This strain was demonstrated to have good features to control the core-rot caused by A. alternata in the field, and during cold storage.