ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Decay and physiological disorders of 'Golden delicious' apples in relation to cultural management and fruit quality.

Juan, J. L.; Camps, F.; Frances, J.; Montesinos, E.; Badia, M.;

Acta Horticulturae Year: 1997 Issue: No. 448 Pages: 273-282 Ref: 18 ref.

1997

บทคัดย่อ

In 1995, a study was conducted in Girona, Spain, to evaluate the susceptibility of fruit collected from 11 orchards to storage decay and to assess the effectiveness of the biological agent Pseudomonas fluorescens EPS 288 against Penicillium expansum. The fruit was subjected to pre-storage treatments: 20 g CaCl2 + 1.44 g ethoxyquin/litre, the CaCl2-ethoxyquin mixture + fungicide (folpet 1.0 g a.i/litre and imazalil 0.375 g a.i./litre), and compared with an untreated control. Bitter-pit and superficial scald were adequately controlled by CaCl2-ethoxyquin in all orchards. Bitter-pit in the untreated controls was inversely related to Ca content at harvest and plant density, and was directly related to one-year shoot growth and fruit-N content at harvest. Superficial scald was only present in the controls and appeared in early harvested fruits. Severe scald was related to low K content in the fruits and leaves, and to low titratable acidity in fruits. In another experiment, surface disinfected and wo

unded fruits from all the orchards were inoculated with Penicillium expansum after treatment with either the fungicide mixture or with Pseudomonas fluorescens. Diseases were controlled by both treatments. In the controls, an inverse relationship was observed between Ca content of the fruit at harvest and susceptibility to decay; susceptibility was also linked to fruit maturity and to N content in fruits and leaves.