Effect of the application of prohexadione-calcium on the growth of ‘Packham’s Triumph’ and ‘Hosui’ pears (Pyrus communis L.)

The necessity of controlling the vegetative growth fruit trees is a growing concern for farmers since vigorous plants tend to have lower yields. use chemicals that inhibit plants, such as prohexadione-calcium (PCa), an inhibitor gibberellins which currently used regulator apple trees, agricultural practice aimed help in reducing pruning time and cost. Pear grafted on rootstocks present high rates growth, hindering production. Thus, this work evaluate effect application different doses plant PCa time, radiation incidence, productive quality parameters ‘Packham’s Triumph’ ‘Hosui’ pears rootstocks. Two applications were carried out, first after falling petals (2009-10-10), second twenty-one days (2009-11-02). observed results showed significant pear both cultivars. photosynthetic active (PAR) was only variety, not being trees. No statistical difference relative yield fruits, cultivars, showing has caused any deleterious development.