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柑橘叶脉开裂症属于多病因的病症,缺Mg或缺B均可导致发病。对‘纽荷尔’脐橙[Citrussinensis(L.)Osbeck‘Newhall’]的缺Mg叶脉开裂症病株,在生长季4月采用1.0%硝酸镁叶面喷施矫治2～3次,可有效降低病叶发生。通过福建柑橘产区普查,由缺Mg引起叶脉开裂症占86.2%,其次为B与Mg共同缺乏,缺B仅占2.3%。不同品种缺Mg叶脉开裂的感病顺序为:纽荷尔脐橙>琯溪蜜柚,其它发病品种还有金柑、早熟温州蜜柑、瓯柑。采用易感品种纽荷尔脐橙与抗性品种椪柑互为中间砧高接比对发现,纽荷尔脐橙对Mg和B的吸收能力低于椪柑,对K的吸收高于椪柑,这可能是纽荷尔脐橙易患叶脉开裂症的原因。缺Mg和缺B病症的最显著的区别为,缺Mg叶脉开裂多位于叶片顶部“∧”形黄化部位;缺B叶脉开裂症病叶呈绿色不黄化;Mg、B缺乏症的病叶主脉和侧脉明显开裂与全叶黄化,或叶脉开裂达基部“∧”形绿色区域。
Citrus vein dehiscence disease is a multi-etiological disease, lack of Mg or lack of B can lead to the disease. The lack of Mg dehiscence in ’Newcastle’ navel orange [Citrussinensis (L.) Osbeck’Newhall ’] was treated with 1.0% magnesium nitrate foliar spray for 2 or 3 times in the growing season in April, which was effectively reduced Sick leaves occur. According to the census of citrus producing areas in Fujian Province, the incidence of leaf vein dehiscence was 86.2% due to lack of Mg, followed by the lack of B and Mg, with only B accounting for 2.3%. The susceptible sequence of Ca deficiency in different varieties was: Newhall navel orange> Guanxi honey pomelo, other varieties of kumquat, early maturity Wenzhou mandarin, and Ouantan. The use of new varieties of Newhall navel orange and resistant varieties of high-yielding on the middle anvil showed that Newhall navel orange had lower absorption capacity of Mg and B than Kombuon and higher absorption of K than Kombuon, which may be New Zealand Urinary Navel orange leaf easily lead to the cause of dehiscence. The most significant difference between Mg deficiency and B deficiency was that the absence of Mg veins was mostly located at the “Λ” -shaped yellow site on the top of the leaves; the leaves of the degenerative B-veins dehiscence were green yellowing; Mg, B deficiency The main vein and lateral veins of the diseased leaves are obviously dehisced and completely luteinized, or the veins are dehiscted up to the base of the “∧” shaped green area.