论文部分内容阅读
大麦黄花叶病的病状是黄色花叶,有时叶片生短坏死条斑,植株矮缩。寄主仅大麦属(Hordeum spp.)8种。小麦属(Triticum spp.)17种,山羊草属(Aeoilops spp.)11种,黑麦(Secale cereal)和燕麦(Arena sativa)等40种禾本科植物不感染。病毒能通过病根、病土及病土浸出液传染,病茎叶、种子和昆虫等不传染,病田10厘米以内的表土致病性最强,病土离种子0～10厘米发病率最高,离种子30厘米也能发病。病土加消毒土1000倍混和仍有致病性。田间主要感染期在出苗后1个月内。3月中旬病株出现最多。大麦苗期0～10厘米处的土温在8.5℃以上时能发病,5.5℃以下则不发病。二棱大麦(Hordeum distichum L.)发病重,多棱大麦(H.vulgare L.)发病轻。早播病重,迟播病轻。大麦感病品种连作4年以上,造成全田严重发病。七十年代中期以来,本病在浙江省及长江中、下游数省流行,其主导因素是大面积连年种植感病品种早熟3号。
The symptoms of barley yellow mosaic disease is yellow mosaic, sometimes short necrotic leaf streaks, plant dwarf. Host only Hordeum (Hordeum spp.) 8 species. 17 species of Triticum spp., 11 species of Aegilops spp., 40 species of gramineous plants such as Secale cereal and Arena sativa were not infected. The virus can be transmitted through diseased roots, soil and soil leaching solution, the disease stems, leaves, insects and insects are not infected, the disease within 10 cm of the topsoil within the strongest pathogenicity, the highest incidence of disease from the soil 0 to 10 cm, Seeds 30 cm can also be disease. Sick soil plus disinfection 1000 times mixed still pathogenic. The main period of infection in the field within 1 month after emergence. In mid-March the most strains appeared. Barley seedling 0 ~ 10 cm soil temperature at 8.5 ℃ or more when the disease, 5.5 ℃ the following is not disease. Hordeum distichum L. was severely ill and H. vulgare L. was less susceptible. Early sowing seriously ill, late sowing light. Barley susceptible varieties for more than 4 years, resulting in serious disease in the whole field. Since the mid seventies, the disease prevalence in several provinces in the middle and lower reaches of Zhejiang Province and the Yangtze River, the dominant factor is the early maturing of the susceptible cultivar No. 3 on a large area.