Abstract
Abstract In fruit thinning experiments performed during the June, 1970 drop period in mandarin (Citrus reticulata Blanco cv. Wilking), both 200 and 400 ppm naphthalene acetic acid (NAA), applied 6 days before extremely onset of hot weather, increased fruit size without significantly decreasing yield. Under other conditions, NAA sprays did not cause enough additional fruit drop to thin the crop. In 1972, 400 and 600 ppm NAA proved ineffective. A new thinning agent, 1-(α-naphthaleneacetyl)-3,5 dimethyl-pyrazole (TH656) applied at 160 ppm, brought about a significant increase in fruit size without decreasing yield.
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