Tomato Varieties for the Southeast

Tomato varieties for the Southeastern USA are pretty wide-open for most locations, but there are certain considerations. I thought I’d start some posts about tomato varieties well-suited for different locations around the USA. And this, my first post, is on the Southeastern USA.

Celebrity Hybrid Tomato

What is the South East?

Well, here are the boundaries I’m considering the Southeast:

South of Virginia on the eastern seaboard
East of Texas
South of Kentucky in the middle part of the USA.
I’ll include Arkansas, but exclude Missouri.

So now that we know the boundaries, what tomato varieties are good for this area? Let’s consider the two things common to Summer in most of these locations.

Heat. Humidity.

While a little of both are great for growing tomatoes, too much of a good thing spells bad news for your eventual fruits. So what kind of problems do the heat and humidity cause in the Southeastern USA?

Yikes! There’s a Fungus Among Us!

Unfortunately, fungus thrives in humid locations without good air circulation. Diseases related to fungal infections include alternaria, blights, gray leaf spot, fusarium wilt, damping off, verticillium wilt, mold….you get the idea.

If you are finding a lot of fungal infections in your plants, you’ll want to at least think about some hybrid tomato varieties that are more resistant to these problems. You’ll recognize them by the letters after the tomato name; they include:

A – alternaria
F – fusarium wilt strain I
FF – fusarium wilt strain I & II
V – verticillium wilt

So for example, if you look at the description for the tomato variety called Big Beef, you’ll see the letters VF1F2TNA, which means the tomato is resistant to alternaria, both strain 1 and 2 of fusarium wilt, verticillium wilt, tobacco mosaic virus (the “T”) and nematodes (the “N”).

Other hybrid tomato varieties with good fungal resistance include:

Applause (ASCF1F2StV)
Celebrity (VF1F2NTASt)Â (one of my favorite hybrids)
Country Taste (F1F2TV)
Fabulous (VF1F2TASt)
Razzleberry (VF1F2)

So this gives you an idea of what to look at when evaluating one of the tomato hybrids. (In addition to taste, of course.)

Other Tomato Diseases

Unfortunately, fungal diseases aren’t the only ones to threaten our homegrown tomatoes. We also have to worry about bacterial diseases (bacterial speck, spot, wilk, canker, fruit rot, etc.). And if that wasn’t bad enough, we have nematodes and viral diseases. It’s a wonder that we have any tomatoes at all!

The chances of bacterial diseases can be greatly reduced by careful mulching, as it’s the bacteria in the soil that causes problems. Nematodes…well, if you have them in the soil, the best thoughts would be to either plant your tomatoes in containers (using potting soil) and/or plant hybrids that are resistant to nematodes. Viral diseases can also be present – yikes!

(You may want to read the post on tomato diseases to become more familiar with these banes to growing tomatoes.)

What About Heirloom Tomatoes?

Sure, you can grow heirlooms! Just keep in mind that because they since they don’t have all those extra letters after their name, you’ll not know right off the bat what kind of resistance a variety has. You’ll need to be more on the lookout for any problems. Make sure your plants have plenty of air circulation (without being too windy), mulch the soil and consider growing in containers if you have a problem with nematodes. Oh, and don’t splash water on the plants when watering.

If you live in a location where it’s hot but not necessarily humid, you have more wiggle room in the summer. But of it’s really hot, you’ll want to pick tomato varieties that set fruits when many days go well over 90 degrees. The big beefsteaks are usually a little more trouble in this respect, compared to the tomatoes which grow to be less than 8 ounces.

Heirlooms that seem to do well in the southeast heat and humidity are:

Cherokee Purple
Black Krim
Black Prince
Bradley
Clear Pink Early
Matina
Just about any cherry tomato

Where I live in South Florida, I try to grow most of my heirloom tomatoes on the “shoulders” of the season. In other words, I do my best to avoid having the fruit trying to set between mid-July and mid-August, when it’s the hottest. This may mean starting the seeds earlier than normal so I can get the seedling plants outside at the first possible moment.

Tomato Plant Diseases

Uh-oh, you’ve survived the tomato insects, only to be confronted with tomato plant diseases. There is hope, and most can be treated organically.

Let’s take a look at the diseases that can wilt, blight or kill your garden-grown tomato plants.

Tomato Plant Diseases

Some of the diseases reduce the number of fruits, but leave them edible; some don’t. The most common diseases are as follows.

Bacterial Canker: Wilting and upward rolling of margins of leaves; generally one side of plant is affected before the other. Leaves brown, wither and die, but remain attached to the stem. Stems may have open cankers and yellowish decay of inner tissues. Spotting of the fruit; spots 1/8″ to 1/4″ in diameter; small cavities in central portion of the fruits. Some protection is afforded if soil is not allowed to be splashed onto the stems/leaves (use mulch soon after planting). Slight additional protection if mulched with compost.

Bacterial Wilt: Gradual drooping and eventual dying of the leaves over the entire plant without marked yellowing of the foliage. Stem decayed at ground line and covered with a whitish fungus growth, with small, light-brown circular spots. Some protection is afforded if soil is not allowed to be splashed onto the stems/leaves (use mulch soon after planting). Slight additional protection if mulched with compost.

Blight, Early: Rather large spots, up to 1/2″ in diameter. The spots are brown with concentric rings giving a bulls-eye appearance. Plants partially or completely defoliated. Seedlings may be girdled at the ground line. Fruits developing large, dark, leathery spots near stem ends, with dark, dry decay of the flesh underneath. Development favored by warm, humid conditions, so this is prevalent in the Southeast.

Blight, Late: Grayish, water-soaked patches on leaves, increasing in size rapidly. Fungus growth also evident on underside of the leaves. Water-soaked spots on fruits; spots enlarging rapidly and sometimes cover over half of the surface. Spots become brown with a firm corrugated surface. Disease spread in the wind from overwintered debris for great distances. Development favored by cool, moist conditions, so this is more of a problem in the Pacific Northwest.

Fusarium: Yellowing, wilting, and death of the leaves from the base upward, followed by the gradual death of the plant. Dark-brown discoloration of woody tissues just below the green outer cortex of stem. No soft decay of stem. Symptoms may be apparent on only one side of the plant, or may appear on both sides. Does not effect the fruits (except in their quantity). A problem largely in the Southern USA (controlled by temperature in the north). Tomatoes resistant to fusarium are marked with a capital “F” following the variety name.

Nematodes: Plants are dwarfed, sickly, and will sometimes wilt readily in dry weather. Roots showing swelling or galls. This is actually caused by a tiny worm, and if you get rid of the nematodes, you will remove the problem (see Insect section). Tomatoes resistant to nematodes are marked with a capital “N” following the variety name.

Septoria: Older leaves show numerous small, roughly circular spots 1/16″ to 1/8″ in diameter with dark margins and gray centers dotted with tiny dark specks. Plants often seriously defoliated and fruits exposed to sun, thus making the fruits susceptible to sunscald. Fruit remains edible.

Southern Blight: Slow wilting and eventual death of the plant; soft tissues of the stem decayed, with cavities that contain a grayish-white fungus growth and large, black spots. Fruits sometimes show a watery soft rot.

Stem Rot: Emergence failure or collapse and wilting of seedlings, caused by a decay of the stem at the ground line or roots. Use a sterile seed starting mixture to help prevent this problem.

Tobacco Mosaic Virus: Green or yellow mottling of leaves; some curling, malformation, and dwarfing of leaflets. Plants slightly stunted. Fruits mottled by yellow strains of the virus. Can be passed from plant to plant by handling wet plants that are infected, then handling healthy plants (for example, when pinching back shoots on a damp morning.) This disease is widespread throughout the USA. Tomatoes resistant to tobacco mosaic are marked with a capital “T” following the variety name.

Verticillium: Yellowing, wilting, and loss of foliage, beginning at the base of the plant. Plants wilt during the day (even if watering is not an issue), but often appear to recover in the evening. Plant growth is stunted, but the plant usually survive the season. Discoloration of the woody tissues of the stem, generally confined to the lower part of the plant. Does not effect the fruits (except in their quantity). Tomatoes resistant to verticillium are normally marked with a capital “V” following the variety name (in seed catalogs, at any rate).

One thing to note — jut because a tomato variety is marked as “resistant” to various diseases, it doe not mean the plant can’t succumb to the disease. It just means that if the diseases are prevalent in your area they have a better chance to grow long enough to produce a crop of tomatoes.

One more thing; just because a tomato variety isn’t marked as resistant doesn’t mean it isn’t! The vast majority of heirloom and open-pollinated varieties have not been officially tested, because it’s expensive and no one wants to run the tests on tomatoes that you can save the seeds from. Many are resistant, some aren’t.