Post harvest diseases fruits and vegetables - Xavier University ...

FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE
146 Postharvest Diseases of Fruits and Vegetables
activity against yeasts, could be used to supplement biological control by
yeasts (Biggs et al., 1997). As a matter of fact, calcium salts were
actually found to improve the efficacy of yeast biocontrol against various
postharvest pathogens (McLaughlin et al., 1990; Droby et al., 1997).
Combined Treatments
Calcium application can be combined with postharvest fungicides, heat
treatment or biological control, allowing a lower concentration or level of
either of the components while maintaining the effectiveness of the
treatment in decay suppression. For combined treatments comprising
heating or biological control with Ca application, see the chapter on
Physical Means - Heat Treatments, or that on Biological Control -
Combined Treatments and Integration into Postharvest Strategies.
New combinations which have recently been described (Saftner et al.,
1997) include CaCl2 application plus polyamine biosynthesis inhibitors.
Three different polyamine biosynthesis inhibitors have each been found
to reduce the in vitro growth of B, cinerea and P. expansum, either alone
or in combination with CaCh, whereas CaCb applied alone had no effect
on fungal growth. However, experiments in vivo showed that pressure
infiltration of each of the polyamine inhibitors or of CaCb solution into
apples, reduced soft rot development by the two pathogens. A
combination of Ca with a polyamine inhibitor enhanced the decay
reducing effect of either of the separate treatments. It was, therefore,
concluded that a combination of specific polyamine inhibitors with CaCb
pressure infiltration is capable of effective decay suppression, although
fruits treated with such a combination were less firm than fruits treated
with Ca alone (Saftner et al., 1997).
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