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从近几年套袋苹果发生的问题看,不论是套纸袋还是套塑膜袋的果,最普遍、最严重的是果面上发生黑点病。 1.病症辨识 发病初期,果实萼洼周围出现针状小黑点,有的象芝麻,有的象绿豆,病斑只发生在果实表皮,口尝无苦味,贮存期也不扩展蔓延,此为黑点病;有些黑点分布在萼洼上部和果顶周围,胸部也有,黑点一发生就成较大的斑点,只危害皮层,口尝有苦味,生长后期和贮存期黑斑扩大,并稍凹陷,此病为缺钙引起的痘斑病,严重时和苦痘病并发;有的为玫褐色斑点,在果面上分布无规律,病斑较大时,病部溃烂,扩展快,造成整果溃烂,病烂处口尝有甜味,此为轮纹烂果病;有的果点粗大爆裂,呈黑点状,多是含酮、锰离子或乳剂类药物刺激所致。
From the bagging apple in recent years, the problem occurs, whether it is a set of paper bag or plastic film bag sets of fruit, the most common and most serious is the occurrence of black spots on the fruit surface. 1. Identification of the disease Early onset, the fruit calyx depression around the needle-shaped black spots, and some like sesame seeds, some like mung bean, lesions occur only in the epidermis of the skin taste no bitter, storage period is not extended, this is Black spot disease; some black spots in the upper calyx depression and the top of the fruit around the chest, there are black spots on the occurrence of a larger spot, only the cortex, tastes bitter taste, growth and development of dark spots during the expansion, and Slightly depressed, the disease is caused by calcium deficiency pox disease, severe and bitter pox disease complicated; some brown spots, irregular distribution in the fruit surface, when the lesion is larger, the ulceration of disease, rapid expansion, Resulting in whole fruit ulceration, bad taste taste sweet, this is rotten rotten rot disease; some coarse rupture of fruit points, black spots, mostly with ketones, manganese ions or emulsion drugs caused by stimulation.