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罹短枝枯顶病的梨树于7月份表现叶脉失绿,顶部叶片畸形,顶梢和侧梢枯顶,并产生裂果。发病果园土壤的硼含量(0.56ppm)高于一般果园(0.14ppm)。罹病植株叶的硼含量达120ppm,而正常植株叶的硼含量仅39ppm。在高硼条件下(>0.5ppm)砂培的植株表现出与感病果园植株相同的症状,其叶的硼含量达122.2ppm,新梢皮部的硼含量高达166ppm。高硼处理导致叶中钾含量降低和磷含量增加,但对叶中钙、氮和镁含量没有影响。认为梨新梢枯顶是由硼毒害所致。(文摘号5510) 译自(英)《园艺学文摘》1988年第58卷第9期译者:吴瑗
In July, the pear tree suffering from a spur-set disease showed chlorosis, top leaf deformities, top-shoots and lateral shoots toping and cracking. The content of boron (0.56ppm) in the orchard soil was higher than that of the general orchard (0.14ppm). The diseased plant leaves have a boron content of 120 ppm, whereas the normal plant leaves have a boron content of only 39 ppm. Plants sable under conditions of high boron (> 0.5 ppm) showed the same symptoms as susceptible orchard plants with boron content of 122.2 ppm in leaves and up to 166 ppm in shoots. High boron treatment resulted in the decrease of potassium content and phosphorus content in leaves, but had no effect on the content of calcium, nitrogen and magnesium in leaves. Pear shoot tip is caused by boron poisoning. (Abstracts No. 5510) translated from (British) “Horticultural Abstracts” Volume 58, No. 9, 1988 Translator: Wu 瑗