Butternut squash - yellow leaves
Attached is a photo of our squash plants - were doing very well, planted in mixture of good topsoil with organic compost. Well watered, possibly over-watered; due to foliage density, top-watered on leaves, possibly causing fungus development? If so, can this be diagnosed by inspection and/or treated? Thanks, Jeff Wilkes, Marie Reed Learning Center school garden.
The leaves on the butternut squash does not look like it was subject to a disease or insect problem. It can be normal for lower squash leaves to yellow and dieback. Handpick the leaves. It is best to water deeply around the base of the plants. If you have to water from overhead, do it early in the morning so the leaves can dry before nightfall and be less prone to fungal problems.
See our vegetable profile for more information http://extension.umd.edu/learn/vegetable-profiles-winter-squash