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一、叶脆叶色墨绿色,叶面皱缩不平,并伴有粒状突起,质地发脆,手握即碎。植株长势差,瓜少而小。出现这种病状,多是有机肥使用少,化肥施用量过大造成的。或是使用农药浓度过大而频繁,降低了叶片的光合效率。生产上,一般1/15公顷施优质腐熟的有机肥5000～7000千克,追施化肥、人粪尿或饼肥时,交替进行。农药使用时,应严格按规定配药,用药间隔期一般应在7天以上。另外还需根外施肥,如用0.2%磷酸二氢钾加0.1%尿素,再加入1%蔗糖,不仅增加了叶面营养,而且还减轻了霜霉病。
First, leaf crisp leaf color dark green, foliar folds uneven, and accompanied by granular protrusions, crisp texture, hand that is broken. Plant growth is poor, less melon and small. Occurrence of this symptom, mostly use less organic fertilizer, caused by excessive use of chemical fertilizers. Or the use of pesticide concentration is too large and frequent, reducing the photosynthetic efficiency of leaves. Production, the general 1/15 hectare of high-quality maturity of organic fertilizer 5000 to 7000 kg, topdressing fertilizer, human waste urine or cake when alternately. Pesticide use, should be strictly in accordance with the provisions of pharmaceutical, drug interval should generally be more than 7 days. Also need to root fertilization, such as 0.2% potassium dihydrogen phosphate plus 0.1% urea, then add 1% sucrose, not only increased foliar nutrition, but also reduce downy mildew.