Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: J. J. Smoot x
Clear All Modify Search

Abstract

2-Chloroethylphosphonic acid (Ethrel) applied at 50 to 200 ppm as a preharvest spray, showed considerable promise in degreening ‘Robinson’ and ‘Lee’ tangerine fruit. The preharvest degreening resulted in less postharvest degreening time required for acceptable color and less fruit decay during storage. Ethrel concn between 100 and 200 ppm caused abscission of some old leaves, but had no apparent effect on external appearance other than color.

Open Access

Abstract

The long voyage of Florida grapefruit (Citrus paradisi Macf.) to Japan and extended marketing periods on arrival were associated with a problem with excess diphenyl (biphenyl) residues. Japanese food additive regulations have necessitated reliance on the vapor-phase fungistat diphenyl, for which residues in the fruit increase with time after packing. Residues in some shipments unexpectedly exceeded the Japanese tolerance of 70 ppm. Experiments designed to identify the effect of various factors on diphenyl residues are reported. The amount of diphenyl, temperature before refrigerated transit and exposure time, especially before refrigeration, affected diphenyl residues. Air filtration had little effect. Very early season grapefruit (harvest started before legal maturity) in August and September 1978 absorbed excessive diphenyl residues. Excessive absorption of diphenyl by grapefruit is apparently characteristic of very early fruit.

Open Access