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The variation in natural fruit drop of ‘Scarletspur Delicious’/‘M.7’ (M.7) apple (Malus ·domestica) trees in a commercial orchard over a period of 11 consecutive years was visualized using box and whisker plots. Delaying harvest until 1 week after the normal harvest date resulted in fruit drop ranging from 2% to 33% depending on the year. The effects of aminoethoxyvinlyglycine (AVG) and naphthaleneacetic acid (NAA) on fruit drop and fruit firmness at normal and delayed harvests was monitored each year. AVG and NAA programs tended to mitigate fruit drop most effectively in years when natural fruit drop was heavy. AVG delayed the loss of fruit firmness, whereas a preload NAA program delayed firmness loss in fruit that were harvested 3 weeks after the normal harvest date only. A standard NAA program for drop control did not accelerate softening of ‘Scarletspur Delicious’ during the first 3 weeks after the normal harvest date. Growers should closely monitor fruit maturity and stem loosening during the harvest window each year to minimize the risk of major losses due to fruit drop. When timely harvest is not possible, perhaps due to unforeseen weather events or constraints in labor availability, or poor management, then use of harvest management aids such as AVG or NAA becomes critical on cultivars prone to fruit drop.

horttechnology

The Effects of Aminoethoxyvinylglycine and Naphthaleneacetic Acid Treatments on Abscission and Firmness of ‘Scarletspur Delicious’ Apples at Normal and Delayed Harvests