Why does your Cucurbita pepo have yellow leaves? Diagnose the cause and fix it with our step-by-step guide.
Pet FriendlyIn Cucurbita pepo, nitrogen deficiency typically manifests as a uniform yellowing of older leaves first, as the plant mobilizes nutrients to new growth. This often occurs in sandy soils or after heavy rainfalls have leached nutrients away.
Excessive moisture causes root hypoxia, preventing the squash plant from absorbing essential oxygen and minerals. This leads to chlorosis (yellowing) and often makes the leaves feel limp or heavy.
The feeding activity of Squash Bugs (Anasa tristis) punctures plant cells to suck out sap, which can cause localized yellowing or spotting that eventually turns the entire leaf chlorotic. They often hide underneath the large leaves.
This fungal pathogen (Peronospora cubensis) causes angular, yellow patches on the upper surface of the leaves, often bounded by the leaf veins. This is highly prevalent in high-humidity environments common for cucurbits.
If the soil pH is too high (alkaline), Cucurbita pepo cannot uptake iron. This results in interveinal chlorosis, where the leaf tissue turns yellow but the veins remain dark green.
Your plant might also be experiencing one of these issues:
English
Italiano
