Chemical thinning of pears (preliminary results)
2011
Kosina, J., Vyzkumny a Slechtitelsky Ustav Ovocnarsky, Holovousy (Czech Republic)
The aim of this study was to find a possibility of reducing the fruit set at pears by means of chemical thinning of fruitlets. Tests were established in RBIP Holovousy with cultivars Conference and Charneuse in years 2009-2010. Preparations based on NAA - naphtalenic acid (Rhodofix, Agrostim Forte), ethephon (Ethrel), BA - 6-benzyladenine (maxcel, Globaryll 100) and tank mix application of BA + NAA were tested. All experimental treatments of chemical thinning including hand thinning increased the weightproportion of fruits higher than 65 mm, fruit size and reduced total yield per tree. The chemical thinning influenced positively the return blood especially with the ethephon treatment at the 19 mm fruit diameter stage. The best effect on increasing fruit size was seen with treatment of tank mix Rhodofix (10 ppm NAA) + Maxcel (100 ppm BA) at the 10-11 mm fruitlet diameter stage.
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