Answer: Gourds are subject to a number of disease problems that could cause wilting and spots. Based on your description I can't make a diagnosis, but here are two sites which you may find helpful:
Many gourds need a long warm growing season to produce large mature gourds so they need to be fed and watered to encourage them into vigorous growth as soon and for as long as possible. The low production might be accounted for by poor pollination -- caused either by a lack of insects or by the vagaries of the weather.
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