Evaluation of the effect of Brevis product on the chemical thinning of fruits in the Pink Lady apple plantation

Abstract

The study subject of the experience was Pink Lady apple variety, grafted on M26. The trees were trained as slender spindle system. The distance of plantation is 4.0 x 1.5 m. The aim was to determine the efficacy of different agents on the chemical thinning of apple fruits. To investigate thinning effect of apple fruits proposed to study the following variants: 1. Control – without treatment; 2. Geramid New, 1.3 l/ha; 3. Brevis, 1.1 kg/ha; 4. Brevis, 1.65 kg/ha; 5. Brevis, 2.2 kg/ha. The treatment with the product Geramid New was carried out by spraying, at the fall of 80% of the petals, + 2-3 days, and with Brevis et development stage 10-12 mm fruitlet diameter. During the research, it was studied the number of blossom clusters after thinning, mean fruit weight, yield, average fruit diameter and size classes based on their diameter. It was established that, the good effect of thinning was noticed after application of Brevis, 1.65 kg/ha.