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由于杂交制种稻不育系具异交结实、与父本花时差较大、花柱活力不强、颖壳关闭不及时等特点,在盛花期药治粒黑粉病,防效虽佳,但对结实率普遍产生负效应。这与药剂种类、喷药时间、次数、剂量,以及使用调花激素的次数和剂量等密切相关。通过优化制种技术,促进花期花时相遇,提高自然结实率,选用安全有效药种,改进药剂和激素的使用技术可有效地缓解药剂防治与提高结实率之间矛盾,达到防病增产的目的。
Because hybrid sterile male sterile lines are outcrossed and fructified, with large paternal flowering time, column vigor is not strong, not timely closure of chaff, etc., in the flowering drug treatment of powdery mildew, although the good control effect, but Generally have a negative effect on seed setting rate. This is closely related to the type of medicament, spraying time, frequency, dosage, and the frequency and dosage of using the floral hormones. Through the optimization of seed production techniques, promoting the flowering time encounter and increasing the rate of natural seed setting, the selection of safe and effective drugs to improve the use of pharmaceuticals and hormones can effectively alleviate the contradiction between pesticide control and improvement of seed setting rate and achieve the purpose of disease prevention and yield increase .