ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Biological control of litchi fruit diseases.

Korsten, L.; Villiers, E. E. de; Jager, E. S. de; Harmelen, M. W. S. van; Heitmann, A.;

Yearbook - South African Litchi Growers' Association Year: 1993 Vol: 5 Pages: 36-40 Ref: 19 ref.

1993

บทคัดย่อ

Microbial epiphytes isolated from chemically sprayed and unsprayed Litchi chinensis trees, yielded 3 promising antagonists, later identified as Bacillus stearothermophilus, B. megaterium and B. licheniformis. These isolates effectively inhibited Phomopsis sp, Pestalotia sp, Alternaria alternata, Penicillium sp. and 7 unidentified postharvest pathogens of L. chinensis, when evaluated in vitro. Optimization studies revealed that postharvest decay was more effectively reduced with B. megaterium applied as a fine spray compared with dip application. It was found that 108 cells/ml B. licheniformis was the most effective concn of antagonist to reduce postharvest decay, while all concn (106, 107 and 108 cells/ml) were equally effective in reducing postharvest infections. Additives (Agral 90 and L-alanine and glucose) were equally effective in enhancing the ability of B. stearothermophilus to reduce postharvest fruit infection. Antagonists applied as a dip singly or in a mixture were more effective in reducing decay, postharvest infection and fruit browning, than a warm water benomyl (as Benlate) treatment. B. subtilis (originally isolated from the avocado phylloplane) was also more effective in reducing postharvest decay when compared with the benomyl chemical treatment.