Some of my okra seedlings have been chewed (and slowly killed) just below the soil surface. The stem was not severed but all the vascular tissue was methodically removed, leaving only the pith. What's interesting is that all the affected plants are in a small greenhouse that only gets to the mid 90's during the day. All the seedlings in here have been killed. Adjacent to it is a larger greenhouse that gets to 105-115 and those seedlings are healthy and growing.

What's your take on it?