Abstract
Several new compounds show promise as chemical thinners. Benzyladenine (BA) has been identified as one of the most effective on apples. It is especially useful on McIntosh and Empire but it also thins other cultivars such as Delicious, Golden Delicious, and Idared. It is active at concentrations as low as 50 mg·liter-1. BA thins most effectively when applied at the 10mm stage of fruit development. It increases fruit weight indirectly by reducing crop load, but it can also increase fruit weight additionally and independently of its effect on crop load. BA frequently increases flesh firmness and soluble solids, but it must come in direct contact with the fruit to do this. Fruit treated with BA store comparably to similar sized fruit treated with other chemical thinners. There appears to be no unusual long term effects when BA is used as the only chemical thinner for several consecutive seasons.
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