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腊梅,是我国传统的名花。根据多年的观察和调查研究,腊梅在生长和发育过程中主要有如下几种病害。1.猝倒病腊梅幼苗期的一种主要病害。种实萌发后到幼茎木质化前,由于春季低温、雨水过多,土壤过分潮湿;或在温暖干燥的条件下、在碱性、低洼、板结的圃地;或施用未腐熟的有机肥,播种过迟、覆土过厚等都易引起该病的发生。幼苗发病后常表现为三种类型:(1)芽腐烂型种实萌发后未出土前,幼根和子叶遭受侵染而腐烂;(2)猝倒幼苗出土后遭受侵染在地表或地表下的茎基部,呈现变色腐烂,缢缩而倒伏;(3)立枯幼苗发病后,根颈处变色腐烂,地上部分枯死,并容易折断。因此,根据当地条件,选择适宜播种期,河南一般最适宜的播种为3月上旬至4月上旬,根据腊梅幼苗具有喜肥沃、湿润、疏松、排水良好的土壤,怕旱、怕涝、怕盐碱等特性,在播种时,选择土壤浑厚、疏松、肥沃、湿润、通气、排水良好的沙壤土做苗床;适时早播,进行
Lamei, is China’s traditional flowers. According to many years of observation and investigation, Lamei in the process of growth and development are mainly the following diseases. 1. Dust cataplasm disease in the seedling stage of a major disease. Seed germination after the young stems lignification, due to the spring low temperature, excessive rainfall, the soil is too damp; or in warm and dry conditions, in alkaline, low-lying, knot nursery; or not yet applied to the organic fertilizer, Sown too late, too thick overburden and so easy to cause the disease. Seedlings often appear after the onset of three types: (1) bud rotten seed germination before unearthed, young roots and cotyledons suffered infection and decay; (2) catapult seedlings infested after infection on the surface or subsurface Of the stem base, showing discoloration rotting, shrinking and lodging; (3) Withered seedling emergence, the root neck discoloration rot, the ground part of the withered, and easily broken. Therefore, according to local conditions, select the appropriate sowing period, Henan is generally the most suitable for sowing early March to early April, according to the plum seedlings with a fertile, moist, loose, well drained soil, fear of drought, fear of floods, fear of salt Alkali and other characteristics, when sowing, select the soil is vigorous, loose, fertile, moist, aerated, well-drained sandy loam seedbed; timely sowing, carried out