You may have some of the plant parasitic nematodes, Root Knot, Ring, Root Lesion, etc. and they are difficult to control. Soil Solarization is a short term, about one year, means that can be used, crop rotation is another. There are also supposed to be some plants that will suppress the nematode population.

Here is a link that might be useful: About Plant Parasitic Nematodes

Over the years I have worked on various methods to control destructive nematodes. To date I have found only one that works well for the organic gardener. When planting vegetables open up each planting row and before planting the seeds run handfuls of granulated sugar and uncooked coffee grounds liberally along each row bottom. Plant seeds and water. From then on toss granulated sugar between each row every 14 days. No harm to plants and it will not attract ants. Dried molasses may be substituted for the sugar. It can be purchased in 40# bags at farm/horse stores. If nematodes are also causing lawn problems (common problem in deep south) spread dried molasses once a month on the lawn. As a southern gardener very familiar with GW I know we will have doomsayers make all sorts of comments. Be brave and try this method.

Note: Dried molasses should be stored in a secured plastic bag safe from humidity. If not stored in this manner it will set up harder than a rock.

Oh boy. Are you talking about now? If so, that your carrots and beets are alive is impressive. Those winter-growing crops in florida, they can't take extended heat.

Eggplant will have problems in florida summer, as will tomatoes.

Nematodes are controlled by raising fertility and organic matter, and constant rotation.

Geez! I'd be afraid the sugar would draw fire ants in droves!

Nandina has lived in and conducted these experiments deep into fire ant country for many years. :-) She first commented on this observation well over ten years ago.....right here in the GardenWeb but I think that she's known about it long before that.

Fire ants aren't fond of sugar, fwiw.

They like carbs, but they prefer to get it from other insects and "meat" sources.

Not to say they won't touch sugar...but they like to go for other sources before the sugar.

This post was edited by nc-crn on Thu, Jul 25, 13 at 1:14

Johnny's Seeds claims that mustard as a cover crop can help with nematodes. I believe that other crops of that family might help....daikon radishes, broccoli, turnips, and more. Work the green tops into the soil for best results.