Minimised post-harvest chemical treatments, fruit density per tree, and calcium sprays affect the storability of 'Passe Crassane' and 'Conference' pears in Girona (Spain).
Frances, J.; Juan, J. L.; Montesinos, E.; Vilardell, P.;
Acta Horticulturae Year: 1999 Issue: No. 485 Pages: 161-166 Ref: 14 ref.
1999
บทคัดย่อ
Several pear orchards of cultivars Passe Crassane (1995-1996) and Conference (1996-1997) were monitored for changes in fruit quality and mineral content during the late vegetative period. Pesticide residues and fruit quality were also analysed at harvest. Fruits from orchards were collected, wounded and submitted to 5 different postharvest treatments, including non-treated controls, washed and disinfected controls, a standard chemical treatment (calcium chloride, imazalil and folpet), biological control (Pseudomonas fluorescens EPS288) and combined biological control-reduced chemical treatment. Thereafter, the fruits were inoculated with Penicillium expansum, stored in a controlled atmosphere at 0.5 deg C for 6 months, and fruit quality and incidence of Penicillium rot were determined. Differences in disease incidence were significant between orchards. Fruits from chemical, biological and biological control-reduced chemical treatments were significantly different from non-treated controls for al
l orchards studied. No significant differences were observed between chemical and biological control-reduced chemicals which were the most efficient treatments. The effect of foliar sprays with calcium during the vegetative period and of fruit density per tree (40 or 110 fruits/tree) on flesh firmness and internal browning of Passe Crassane fruits was studied. Intensive calcium treatment (10 sprays of 17.5% CaCl2 until harvest) had slightly significant positive effects on flesh firmness and decreased internal browning. However, the effect of fruit density per tree on internal browning after storage was not significant.