The Use of Prohexadione-Ca on Control of the Alternate Fruit Production of Pear Cv.Passe Crassane

The effects of Prohexadione-calcium (P-Ca) on return bloom and on control of the alternate fruit production in pear cultivar Passe Crassane were evaluated A variety of treatment dosages and timings was applied to 4-5 and 6-year-old trees in 3 years of study The aim of this study was to evaluate the efficacy of applying Regalis by foliar applications in Passe Crassane pear orchards to control the alternate fruit production. Regalis treatments ranging from 50 to 150 ppm were compared with control, without treatments. The first treatment was applied 7days after petal fall and the others every 10 days after the first treatment. Three different dosages were tested: 50ppm, 100ppm 150ppm. Data are collected in full flowering, after two weeks (after fruit set) and in harvesting .The data of 4 years show that the flower number was significantly difference after the treatment of 150 ppm and 100ppm than the application of 50ppm and without treatment and the Prohexadione- Ca decrease the coefficient of alternate production of the pear cv. Passe Crassane. Results show that treatment with Prohexadione controls alternately producing of the pear cv. Passe Crassane Keyword:- Alternate fruit production, Prohexadione-calcium, pear, Passe Crassane