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Abstract
The no. of berries on primary and secondary clusters of ‘Concord’ grape vines was significantly increased by succinic acid 2,2-dimethylhydrazide (SADH) at each temperature exposure in field growth chambers: natural (average day 71° F, night 53°) 51%; warm (day 80°, night 55°-60°) 61%; and hot (day 90°, night 65°-70°) 29%. The SADH treatment also caused a significant reduction in cluster length when compared to the non-treated vine-half at each temperature exposure. The smallest berries were found on the SADH treated half of each vine, and the shortest length of clusters on the vine in the hot condition.
Abstract
Succinic acid-2,2-dimethylhydrazide (SADH) was applied at 0, 500, 1000, or 1500 ppm to ‘Golden Delicious’ apple trees as an early season, or late summer application. Bruising was evaluated using both the pendulum impact and the quasi-static tests. The latter method was also used to evaluate rupture resistance. Fruits were examined at harvest and after several months in storage. In general, results confirmed that SADH does not affect the resistance of fruit in this cultivar to bruising and rupture injury either at harvest or after several months in storage.
Abstract
The effects from the foliar aqueous sprays of DMAS applied between pre- and full-bloom to mature ‘Concord’ grape vines did not appear to be transmitted to the post-treatment year. The number of clusters per vine in the post-treatment year was not influenced either by the concentration or the time of application of DMAS. Yield of DMAS treated vines in the post-treatment year was highly correlated with the number of clusters per vine that year.
Abstract
Treatment with a 1000 ppm solution of N-dimethylaminosuccinamic acid (DMAS) at 30 days after full bloom to bearing apple trees caused a significant increase in resistance of ‘Delicious’ both to bruising and to rupture injury. The onset of increased resistance to bruising by DMAS occurred before that of increased resistance to rupture. Such effects were not found on ‘Golden Delicious’.
Abstract
In 1968 and 1970 applications of gibberellic acid (GA) at berry shatter to mature vines of Vitis labrusca L. cv. Concord treated with succinic acid-2,2-dimethylhydrazide (daminozide, SADH) at first-bloom appeared to reduce cluster compactness by lengthening the rachis, to increase berry size, to reduce the number of shot berries, and to increase further the number of mature berries, cluster weight and yield, as compared to daminozide alone. A single application of GA at 50 ppm at berry shatter was as effective in increasing yield as daminozide at 1000 ppm at first bloom, while GA at 100 ppm was significantly more effective. When GA was combined with daminozide were counteracted. The effect of GA on vegetative development was less pronounced than on yield. Highest yield was from the sequential treatment of daminozide 1000 ppm at first bloom and GA at 100 ppm at berry shatter. In the posttreatment year, yields were significantly higher on vines previously treated with either daminozide at 1000 ppm at first bloom, GA at 100 ppm at berry shatter, or daminozide at 1000 ppm with GA at 50 ppm at first bloom.