ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of temperature of production of Botrytis allii conidia on their pathogenicity to harvested white onion bulbs.

Bertolini, P.; Tian, S. P.;

Plant Pathology Year: 1997 Vol: 46 Issue: 3 Pages: 432-438 Ref: 25 ref.

1997

บทคัดย่อ

B. allii colonies incubated at low temp. have been reported to produce larger conidia that germinate faster and give rise to longer germ-tubes than those grown at room temp. The effect was compared of conidia produced at 20 deg C and at 0 and -2 deg on their pathogenicity to artificially inoculated white onion bulbs, and the effect of conidial concn (5x103 and 5x104 conidia/mm) on disease incidence, lesion area, incubation and latent period during storage at 20, 5 and 0 deg . At all storage temp. and periods tested conidia produced at -2 deg caused a higher disease incidence and larger areas of rot than those produced at higher temp. When the conidial production temp. was raised to 20 deg , the duration of incubation on the bulbs inoculated with 5x104 conidia/mm was more than doubled during storage at 0 deg , tripled at 5 deg and took 50% longer at 20 deg . The incubation period was not significantly affected by conidial concn at 20 deg and only slightly at 5 and 0 deg , but at low temp., the la

tent period was longer because of the delay induced in sporulation. The data were consistent with the packers' opinion that cross-infection of spring onions by long-term refrigerated onions in grading lines caused earlier and heavier rotting.