Introduction And Studies On New Varieties Of Red Pear

The Red De'Aiijou, Sharkrimson, Red Comis, Koscade, Maxred Bafllef of Pyrus communis L. cultivars were used as experimental materials in this paper. The phenophase, botanical characteristics, shoot growth and development characteristics and disease resistance characteristics of Pyrus communis L. cultivars were investigated. The effect of different planting methods(single plant and cluster plant) and paclobutrazol on shoot growth and development were studied. The results showed that:1.The different characteristics and fruit quality of five Pyrus communis L. cultivars were analysed and compared by four year. We selected three early, ate-maturing suitable development cultivars with large fruit, good quality, strong resistance, wide adaptability, high yield characteristics. (1)Sharkrimson: early fruit, early maturity, good quality, high-yielding and strong resistance.It flowered at three years ,resulted at four years and riped at late July. It was one of the earliest ripe fine cultivars. (2) Red De'Aiijou: late-maturing, disease resistance, storability, sweet and sour, rich flavor, good quality. It riped in late September to early October and could be stored into the following June. (3) Koscade: fruit large, nearly round, beautiful, high-yield, disease resistance. It was one of the best quality late-maturing pear cultivars.2. The shoot of Pyrus communis L. cultivars had long growth time , which enter the rapid growth period after germination.It had only one growth peak times one year.3. All the Pyrus communis L. cultivars could resist Venturia pirinaAde, the disease index was 0.Tests honey Si to infect brown spot rate is (57.3%) red, red long the pear infection rust rate is (2%), other varieties had not been infected.4.Cluster plant caused the red pear sapling ahead of time result, the output to be higher than plants only; Seted up the plate duplicate grass to be able to maintain the soil moisture, the stable ground temperature, the improvement soil ventilation, increased the soil fertility. 5. At the shoot prosperous spurts time of Pyrus communis L. cultivars , we spray ed paclobutrazol three times (separately in June 8, on June 18, on June 28). The new tree top growth quantity spurts of three time to 1 time and 2 time reduce 15.1cm and 2.8cm. It contrled new tree top be prosperously long, the promotion differentiation of flower bud and improved the flower bud quality.