HORMONAL CONTROL OF FROST INJURIES ON APRICOT TREES

2 % FRS-4 as choline-analogue is moderating the winter frost injuries, but it isn’t making a decreasion of late spring frosts.
The freezing-point is sunk by choline compound in flower buds.

Recurring frosts of minus 1°C affect very strongly in stages of red budding and of 6–12 mm long fruits.

65 ppm of APFROS hormone compound after hours of frosts is inhibited injuries of cells and bald abscission of little fruits.

The repeated sprays were better than single treatments.
The post-frost treatments had been good usefulness on frost-tender cultivars, so that cv.
Ceglédi /=C./ biborkajszi and cv.
Ceglédi óriás.
The treated trees had been cropped more 40–86 per cent than control apricots.
There were spraying fields 20–50 hectares in each treatments.

IX International Symposium on Apricot Culture

D. Surányi

https://doi.org/10.17660/ActaHortic.1991.293.40