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研究结果表明，在甘肃河西地区，甜瓜大斑病〔Ａｌｔｅｒｎａｒｉａｐｌｕｒｉｓｅｐｔａｔａ（Ｋｅｒｓｔ＆ＨａｒＰｅｒｋ）Ｔｏｓｔｅｄ〕于６月下旬开始发病，７月下旬至８月上旬达发病高峰，病情发展缓慢，为害较轻。甜瓜小斑病〔Ａｌｔｅｒｎａｒｉａｃｕｃｕｍｅｒｉ－ｎａ（Ｅｌ．ｅｔＥｖ．）Ｅｌｉｏｔｔ〕多在７月初发生，７月中旬至８月上旬为发病高峰，来势猛，发病严重。两种病害在１５～２６℃下潜育期均为５～６ｄ。发病程度除与降水量有关外，与露时亦密切相关；水旱塘栽培，阳坡露时短发病轻，阴坡露时长发病重；开花前灌第１水发病重，结瓜核桃大小时灌第１水发病轻；目前生产上的主栽品种黄河蜜、小暑白兰瓜等品种均为感病品种。
The results showed that onset of disease occurred in late June in Alternaria pluriseptata (Kerst & HarPerk) Toshe in Hexi area of Gansu Province, and peaked from late July to early August, with slow progression and less damage. Meloido spot blotch [Alternariacucumeri-na (El.etEv.) Eliott] occurred mostly in early July, with peak incidence in mid-July and early August, with a fierce and serious onset. Both diseases in the incubation period of 15 ~ 26 ℃ are 5 ~ 6d. In addition to precipitation and the amount of precipitation, but also with the exposure is also closely related; cultivation ponds, sunny slopes exposed when the disease is light, shady dew long incidence of severe; Irrigation first water disease light; At present, the production of the main cultivars Huanghe honey, white summer melon and other varieties are susceptible varieties.