Folia Horticulturae

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Effectiveness of HELP application on the protection of fruit plant flowers against frost

Tadeusz Hołubowicz*, Alina Basak**, Eugeniusz Pacholak*

**Department of Pomology
**Agricultural University in Poznań
**D±browskiego 159, 60-594 Poznań, Poland
**Institute of Pomology and Floriculture
**Pomologiczna 18, 96-100 Skierniewice, Poland
**e-mail: tholub@au.poznan.pl

In the years 2001-2002 at the Department of Pomology at the Agricultural University of Poznań the investigations were carried out on 8-9 year old peach trees of ‘Reliance’ and on 26-27 year old apple trees ‘Idared’ on the effectiveness of the protective spraying with HELP (mixture based on vitamin E and C with glicerol) against low temperature damages of flower buds, flowers and fruitlets. The spraying was applied 24, 42 or 44 hours before the frosts occurred. In the years of the experiment the natural spring frosts did not occur in the area of Poznań. Therefore, frost resistance tests were all done in laboratory conditions. The 165 tests included various HELP concentrations, time of spraying prior to the frost occurrance and the developmental stage of the plants. In 52% of tests carried out the protective effect of spraying was proved. The spraying with 4% HELP, done 24, 42 or 44 hours before low temperature occurred, increased the survival of flowers and fruitlets in 6-36% in peach trees and 2-31% in apple trees in comparison to the control samples. These results, however, need confirmation in the natural conditions in the orchard.

Hołubowicz T., Basak A., Pacholak E., 2004. Effectiveness of HELP application on the protection of fruit plant flowers against frost. Folia Horticulturae 16/2: 65-69.