梨锈病是梨树的一种主要病害。它危害梨树的叶片、叶柄,使叶片提早干枯脱落;严重时危害幼果及新梢,被害幼果病部硬化、畸形、腐烂,新梢病部凹陷、龟裂,容易折断,严重地影响树势和产量。我县梨锈病的中间寄主桧柏很多,遍及各地,以致年年锈病发生严重。多年来,果农们采用波尔多液、石硫合剂等杀菌剂于5月以前防治三、四次,仍不能控制其危害而成为梨树病 Pear rust is a major disease of pear trees. It jeopardizes the leaves and petioles of pear trees, making the leaves dry and shed earlier. In severe cases, young and new shoots are endangered. The harvested, hardened, degenerated and decayed young diseased parts of the diseased young shoots are easily sunk, broken and severely damaged Tree potential and yield. Pear rust in our county intermediate owner cypress cypress a lot, all over, resulting in severe annual rust. Over the years, the fruit farmers who use Bordeaux mixture, lime and sulfur fungicides and other fungicides in May to prevent three or four times, still can not control the harm and become pear disease