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Control of abscission of apples with emphasis on thinning and pre-harvest drop


, : Control of abscission of apples with emphasis on thinning and pre-harvest drop. Acta Horticulturae (34): 333-343

Some historical features in the development of chemical thinning sprays and theories as to their mode of action on apples are discussed.


Accession: 000050453

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Related references

Edgerton, Lj, 1973: Control of abscission of apples with emphasis on thinning and pre-harest drop. Acta Horticulturae 34 (1): 333-343

Barlow, H.W.B., 1951: Use of sprays to control fruit drop. VI. Rain and the control of pre-harvest drop in Sunset apples. Sprays of a-naphthaleneacetic acid (NAA) at 10 p.p.m. and a-(2, 4, 5-trichlorophenoxy)proprionic acid (TCPPA) at 5 p.p.m. applied to Sunset apples to control pre-harvest drop were followed within 2 hours by heavy rain. A second set of applications...

Looney N.E., 1975: Control of ripening in mcintosh apples part 1 some growth regulator effects on pre harvest drop and fruit quality at 4 harvest dates. Journal of the American Society for Horticultural Science 100(4): 330-332

Mckenzm, D.W., 1953: Influence of a-naphthaleneacetic acid on the pre-harvest drop of Jonathan apples. I. Effect of repeated applications on pre-harvest drop and fruit quality. Ten-year-old Jonathan trees were sprayed with NAA at 10 p.p.m. about 3 weeks before the predicted harvest date. Spraying was repeated on half the treated trees 14 days later. Control trees were sprayed twice with tap water. The single application...

Pearse, H.L., 1947: The control of pre-harvest drop of apples. Reports indicate that growers are highly satisfied with the control of dropping achieved by using hormone sprays. It is suggested that the grower should apply the spray 3 weeks before the estimated date of harvesting.

Whitaker, E.C.; Mackenzie, P.B., 1944: The control of pre-harvest drop of apples and pears. Thorough spraying with a .001% soln. of naphthaleneacetic acid as soon as the first evidence of pre-harvest drop was noted was effective in preventing the drop of apples and pears during a period of 3 weeks. No detrimental effects of the spray wer...

Pearse, H.L., 1946: Hormone sprays and the control of pre-harvest drop of apples. Experiments were carried out at Elgin, Cape Province, in 1945-46, to test the effectiveness of hormone sprays against pre-harvest drop of apples and to evaluate the difference in efficacy of commercial preparations on the South African market. The...

Van Cauwenberghe, E., 1948: The use of hormones to control pre-harvest drop in apples and pears. The results of the trials descr1bed were somewhat variable, depending on the variety and species (apples or pears) and on the product used. On the whole apples reacted better than pears. Combinations of certain hormones give better results than if...

Gardner, F.E., 1940: Control of the pre-harvest drop of apples by spraying with plant hormones. The author summarizes the previous season's work at the U.S. Horticultural Station, Beltsville, Maryland, on the prevention of abscission by spraying with plant hormones. Thirty separate spraying experiments were made on a large number of app...

Muthoo, A.K.; Raina, B.L., 1999: Effect of NAA and 2,4,5-T on control of pre-harvest fruit drop in Red Delicious cv. of apples in Kashmir. NAA at 20 ppm applied 20 days before harvest reduced fruit drop to 9.08%, while 2,4,5-T at 30 ppm sprayed 30 days before harvest reduced it to 5.91%, compared to 21.97% in the control. The treated fruits recorded slightly higher weight, volume and...