Responses of Orange and Grapefruit Trees to Maleic Hydrazide

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Abstract
Maleic hydrazide (MH) spray delayed spring growth of Valencia orange and grapefruit trees when applied during late winter at concn. of 1000 ppm. or 500 ppm. but not at 100 ppm. Concn. of soluble solids in juice of oranges but not of grapefruit tended to be correlated with concn. of spray. Fruit of the succeeding crop of Valencia oranges had a smaller mean diam. Fruit of Washington Navel orange trees sprayed with MH at bloom or later showed a reduction of mean fruit size, but there was more fruit per tree on sprayed than on unsprayed trees. Severe modifications of fruit in the form of thickened peel and absence of juice vesicles were found in small fruit from trees sprayed at bloom. The quality of fruit from trees sprayed at bloom was altered, and off-flavor was detected. When trees were sprayed several weeks after bloom, no effects on quality of fruit juice were noted.

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