Is this zucchini damage due to vine borer

Asked August 3, 2016, 10:10 PM EDT

The zucchini plants seemed to look "sick" very suddenly. I didn't see any larvae in the vines, or any droppings, but I don't know what else it could be. It's affecting my pumpkin plant too and seems to be spreading.

Anne Arundel County Maryland

1 Response

The good news is that this is not squash vine borer damage. That causes complete plant wilt and collapse like a wet cloth.
Your first and third photos do not show anything terribly concerning, but your second shows a stressed plant.
This may be a combination of factors of tough weather lately (older plants can sprawl open like that) and perhaps squash bugs, which are common, but may evade detection for a while as the young feed under the leaves and adults are secretive and fast moving/elusive.
Take a look at this crop page for summer squash:

and this one for squash bugs: You should monitor for them and other pests regularly. You can try putting a board down near the plant overnight, and checking under it in the morning and squishing those found.