Abstract
In two experiments, succinic acid 2,2-dimethylhydrazide (SADH) at low to moderate rates (62.5–1,000 ppm, 0.93–4.32 kg/ha (0.82–3.84 lb/acre)) increased fruit firmness and decreased fruit drop of McIntosh apples (Malus sylvestris Mill.) proportionately to amount applied. Split and single sprays that applied the same total amount of SADH were equally effective. Addition of Tween 20 at 0.025% (vol/vol) had no significant effect on response. None of the treatments affected cropping over three seasons, fruit color or fruit size in the year of application. Fruit size in the year following application showed a threshold effect in that earlier dates and lower rates had no measurable effect.
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