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

FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE
230
Postharvest Diseases of Fruits and Vegetables
Gliocladium roseum and Paecilomyces variotii, resulted in a partial
control of Botrytis in strawberry fruits and of Alternaria in lemon fruits
(Pratella and Mari, 1993). In the case of Alternaria rot in lemons,
biological control by the fungus Paecilomyces was more effective than the
conventional treatment with iprodion; and in the case of Fusarium rot in
potato tubers, control by T, harzianum was more effective than the
conventional benomyl treatment (Figs. 37, 38). However, some
Trichoderma strains have been found to be pathogenic to harvested
fruits, which may limit its possible use to only a few strains. Moreover,
spraying strawberries with this antagonistic fungus has no effect on the
quiescent infections of Botrytis, which comprise an important proportion
of total storage infection.
A significant reduction in storage decay was achieved by bringing
several yeast species in direct contact with wounds in the peel of
harvested fruit. This procedure resulted in the suppression of the main
wound pathogens in citrus fruit, including P. digitatum, P, italicum and
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• Trichoderma
m Benomyl 0.05%
The treatment
Fig. 37. The antifungal activity of Trichoderma harzianum compared with
conventional fungicide, benomyl, on potato tubers. Statistical differences (at p=
0.05) are indicated by different letters through the application of the Duncan's
Multiple Range Test. (Reproduced from Pratella and Mari, 1993 with
permission of Elsevier Science).
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