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Alternative means to synthetic fungicides on green mold control in citrus fruit.

Lanza, G.; Aleppo, E. di M.; Strano, M. C.;

Italus Hortus Year: 1998 Vol: 5 Issue: 5/6 Pages: 61-66 Ref: 19 ref.

1998

บทคัดย่อ

Alternative means to synthetic fungicides on green mold control in citrus fruit.

A number of alternative methods for the control of green mold on Citrus spp., caused by Penicillium digitatum, are reviewed. Enhancement of host defence mechanisms at the wound site, by holding fruit for 3 days at temperatures and humidities (32 deg C in a water-saturated atmosphere) conducive to wound healing and detrimental to P. digitatum development (curing) was found to be very effective in reducing decay in 24-h-old P. digitatum infections of lemons and Valencia Late Oranges. Decay-prone Tarocco oranges requires a higher temperature for optimal disease control. Several naturally-occurring yeast species can suppress P. digitatum when applied in large quantities, however, their eradicant activity is limited and yeasts are unlikely to control 10-h-old incipient infections. It is suggested that these biological control agents would be most beneficial as part of an integrated pest management programme. Integrated treatments, which involved immersing lemon, cv. Femminello siracusano, fruits with

 incipient (24 h) P. digitatum infections in 10% ethanol at 45 deg C for 180 s, followed by curing at 32 deg C for 1 day, or by the application of Candida oleophila, were as effective as dipping fruits in 1 g a.i./litre imazalil. Immersion of lemons in a 3% solution of sodium carbonate plus hot water treatment at 52 deg C were as effective as imazalil treatment.