Collards rotting from the center
I'm seeing something that I've never seen in collard greens in my garden before - one of the plants is rotting from the center. What might be causing this and can it spread to the other plants? (I pulled the rotting plant - we have many collard plants.) The plants otherwise look healthy, but with some damage from insects, standard for this time of year. We use a drip irrigation system and the plants show no heat stress, and we do not use any insecticides. Bugs are controlled by using a dustbuster to suck up white flies and cabbage moth caterpillars.
Hi- we cannot confirm one specific cause from the photo. However, the blackening of the vascular tissue inside the stems is consistent with black rot, a bacterial disease. Please read more about this disease on these web pages: