ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Reduced volume application of fungicides for the control of onion rots.

Grinstein, A.; Elad, Y.; Temkin-Gorodeiski, N.; Rivan, Y.; Frankel, H.;

Phytoparasitica Year: 1992 Vol: 20 Issue: 4 Pages: 293-300 Ref: 11 ref.

1992

บทคัดย่อ

Onion bulbs grown in Israel during 1987-88 were examined at marketing to determine which pathogens were present in particular growing seasons. All stocks examined were infected but the severity and the causal pathogens differed with growing season. Botrytis allii and B. cinerea were the most prevalent fungi in winter-harvested onions, and species of Aspergillus, Penicillium, Fusarium, Rhizopus and Trichoderma were also present. Aspergillus and Penicillium were the only genera found on summer onions which were marketed shortly after harvesting, while Botrytis, Rhizopus and Trichoderma spp. were also isolated from summer onions which had been stored and sampled during the following winter. Most bulbs sampled were contaminated with 2 or more fungal species. Application of diethofencarb + carbendazim, thiabendazole or imazalil using a reduced-volume application (RVA) technique was efficient in controlling the major storage rots (caused by A. niger and B. cinerea) of the bulbs, with the rate of control directly correlated with the cover density of the deposited fungicide, but not with the amount deposited. It is suggested that the RVA technique should enable prolongation of postharvest shelf life and storability of onion bulbs.