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西葫芦雌花少，即生殖生长偏弱的表现。要增加雌花的数量就要抓住调节的关键时期，从调节营养生长与生殖生长入手，适当抑制营养生长，促进生殖生长。
解决方法：
1. 药剂控制
分两种情况：一是抑制剂控制，如用多效唑、矮壮素、助壮素等，都可起到抑制营养生长，促进花芽分化的作用。例如青州等地菜农多采用多效唑控制。西葫芦定植后到坐瓜前和根瓜坐住后是西葫芦容易发生旺长的两个关键时期，在这两个时期各喷洒一次15%多效唑2000倍液，即可有效控制西葫芦旺长。喷药时，需要注意严格控制用量，否则易出现药害。如多效唑等抑制剂过量使用，会使西葫芦植株拔节过短，不利于果实的生长发育，而且容易出现花打顶。二是乙烯利，其也可促进成花，但需要早喷，一般在真叶展开3-4片后喷洒一次，用量为15千克水加入40%乙烯利5毫升即可。乙烯利使用过量，会使瓜条短粗，影响其商品性，而且容易引起植株早衰，因此用量和次数一定要严格控制。
2. 环境控制
当植株出现旺长，成花少时，需要降低棚温、适当控制浇水量、结合留大瓜坠棵等多种措施配合使用，缓解营养生长过于旺盛。在开花结果期棚内白天气温尽量不高于25℃，每茬瓜坐住后再浇水，旺株留一到两个大瓜坠棵等。
3. 药剂点花
由于人工授粉成功率相对低，可采取药剂点花和喷坐果剂的方式，促进多坐瓜，抑制过旺的长势。药剂点花2，4—D用量为20-30毫克/千克。
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