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  • Author or Editor: Charles Bottecelli x
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‘Richared Delicious’ trees received 10 μW·cm−2 of red light, peaking at 660 nm for 1.5 or 15 min nightly at midnight from full bloom until the end of “June drop” in early July. Both light treatments reduced abscission during the June drop period. ‘McIntosh’ apple trees received 10 or 200 μW·cm−2 of red light for 15 min at midnight, beginning in mid-August and continuing nightly until mid-October. Preharvest drop of fruit was delayed considerably one year and slightly reduced the 2nd year. With either cultivar, light treatment had no effect on fruit size, fruit quality, or return bloom in either year.

Open Access