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近十年来,在南北疆果园中陆续发现一些果树显黄化失绿症状。轻者仅树冠外围叶片出现、叶脉间失绿黄化而叶脉仍显绿色的典型症状;严密者全叶片黄化失绿、整株失绿、秃稍甚至整株死亡。黄化失绿病的发生已不同程度地危害着果树生产。 对于这种典型症状的黄化失绿病,国内外已有不少研究者作过工作。较普遍地指出,这是石灰性土壤的通病,或直接称作“石灰诱发失绿病”。由于土壤含有较多的石灰类物质,导致植物所需的铁或锌营养供给不足,影响到植物体内叶绿素的形成,因而出现这种黄化失绿症状。在新疆也有研究者认为可能是某种病毒致病。但此病症可出现在包括苹果、梨、杏、
In the past ten years, a number of fruit trees have been found yellowing chlorosis symptoms successively in the northern and southern Xinjiang orchards. Only the light outside the crown canopy leaves appeared, between the veins lost green yellow and veins are still green typical symptoms; close the whole leaves yellowing green, the whole plant green, bald or even whole plant died. The occurrence of chlorosis disease has endangered the production of fruit trees to varying degrees. For this typical symptoms of chlorosis, many researchers have done work at home and abroad. More generally, this is a common problem in calcareous soils, or directly called “lime-induced chlorosis.” This yellowing chlorosis symptom occurs because soil contains more limestone, which leads to deficient supply of iron or zinc nutrition required by plants and affects the formation of chlorophyll in plants. Some researchers in Xinjiang think it may be a virus-causing disease. However, this condition can occur in including apple, pear, apricot,