PURPOSE: To provide the subject agent containing 5-aminolevulinic acid (salt) as an active ingredient and capable of accelerating the red coloration of the apple pericarp and of improving the coloration degree without affecting on human bodies, environments and the qualities of the fruits by treating the fruit tree in its fruiting time or the fruits themselves with this agent.
CONSTITUTION: This apple pericarp color-improving agent contains 5- aminolevulinic acid or its salt as an active ingredient and, if necessary, further contains, e.g. polyoxyethylene hexitane fatty acid ester as a spreading agent, a saccharide, an amino acid, an organic acid, an alcohol, vitamins, minerals, etc. An aqueous solution containing the coloration-improving agent is applied to the tree of apple in its fruiting time or to the fruit before or after its harvest by a method such as spraying, whereby the red coloration of the apple pericarp is accelerated and its coloration degree is improved without affecting on human bodies, environments and the qualities of the apple fruits.
TANAKA TORU
HOTTA YASUSHI
Next Patent: PLANT CULTURE APPARATUS