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All things green, outdoors, and nature-y. Whether it's animals in their natural habitat, hiking trails and mountains, or planting a little garden for yourself (and everything in between), you can talk about it here.
See also our Environment community, which is focused on weather, climate, climate change, and stuff like that.
(It's not mandatory, but we also encourage providing a description of your image(s) for accessibility purposes! See here for a more detailed explanation and advice on how best to do this.)
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
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Do you see much in the way of white splotches on the leaves? That sort of visual cue would be cause to suspect powdery mildew. Squash bugs can be tough to see, but would be little grey insects around the base of the plant. Another potential cause would be squash vine borers - the adults will often fly away when you get close but their offspring will make tiny holes in the vine and then grow inside the plant.
If you're able to provide a picture of what they look like, it may help to narrow the culprit down.