Some safe treatment for controlling post-harvest diseases of Valencia orange, Citrus sinensus L. fruits
2006
Abdel-Aziz, Shadya A. | Manssour, Faten S.
Survey of naturally decay orange fruits at local markets from different Governorates in Egypt revealed that green, blue moulds and brown spot caused by Penicillium digitatum, Penicillium italicum and Alternaria citri are the most important disease affecting orange fruits. They caused 56.3%, 25.7% and 12.9% infection of surveyed orange fruits, respectively. All chitosan and citral concentrations used significantly reduced the linear growth and spore germination of three fungi. Complete inhibition was obtained with 6g/l chitosan for Alternaria citri, but at 8g/l for P. digitatum and P. italicum. Citral at 8 ml/l also caused complete inhibition for three tested fungi. Bioagent, i.e. Bacillus subtilis and Pseudomonas fluorescens caused high reduction in the growth of pathogenic fungi (ranged between 85.5% to 100%). Orange fruits (Valencia cv.) coated with chitosan, citral or antagonist bacteria protected the fruits against post-harvest fungi. The most effective concentrations of chitosan and citral were 2%. Chitosan decreased diseases incidence by 14.7%, 11.0% and 8.8% while, citral by 16.2%, 13.0% and 12.6% for P. digitatum, P. italicum and A. cirri, respectively as compared with the uncoated fruits after storage for 28 days.
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