บทคัดย่องานวิจัย

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Absorption and persistence of 2,4,5-TP in Packham's Triumph pear trees.

Watts, J. E.; Villiers, O. T. de;

South African Journal of Botany Year: 1993 Vol: 59 Issue: 3 Pages: 332-335 Ref: 19 ref.

1993

บทคัดย่อ

Absorption and persistence of 2,4,5-TP in Packham's Triumph pear trees.

Fruit set is poor, even with optimum compatible cross-pollination, in pear cv. Packham's Triumph trees in the Western Cape region, but is significantly improved by applying 2,4,5-TP [fenoprop] as a postharvest spray in late Apr. This response implies that the compound persists in the tissue long enough to prevent fruitlet abscission in the following spring. In studies with young container-grown trees, 2,4,5-TP was applied at 10 mg/dm3 on 31 Mar., 30 Apr., 30 May or 7 Oct. (full bloom). Trees in a commercial orchard were also sprayed at the same rate in mid-Apr. Residual 2,4,5-TP was determined in leaves, stems, roots, buds and fruitlets at set dates after spraying, using election capture gas chromatography. The compound was not detected in any tissues in the young trees until spring. However, significant amounts were found in buds of the orchard trees until the time of bud break, and also in leaves and fruitlets developing from these buds.