Troubleshooting
Spaghetti squash problems — and how to fix them
Spaghetti squash (Cucurbita pepo) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Powdery mildew
Common late summer; choose resistant varieties.
Squash vine borers
Larvae tunnel in stems; rotate planting.
Blossom-end rot
Inconsistent watering.
No fruit set
Poor pollination; hand-pollinate.
Premature yellowing of fruit
Harvest when skin resists a fingernail.
Prevent spaghetti squash problems before they start
Most spaghetti squash issues are care-mismatch, not bad luck. Dial in the basics:
Spaghetti squash problems — FAQ
Why is my spaghetti squash powdery mildew?
Common late summer; choose resistant varieties.
Why is my spaghetti squash squash vine borers?
Larvae tunnel in stems; rotate planting.
Why is my spaghetti squash blossom-end rot?
Inconsistent watering.
Why is my spaghetti squash no fruit set?
Poor pollination; hand-pollinate.
Why is my spaghetti squash premature yellowing of fruit?
Harvest when skin resists a fingernail.