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Disease Tomato Fusarium Wilt Fungi Resistant

You may have had your own tears, and understandably so. Late Blight of potatoes and tomatoes was the disease responsible for the Irish potato famine in the mid-nineteenth century. Spores are spread by rain/watering splash, insects, and wind, and through our hands and tools and through these mediums they can travel distances. Spore spread is most rapid during conditions of high moisture, marine layer days, and moderate temperatures, 60°-80°F.  Once established, the fungi can over-winter in your garden soil, on debris and weeds.

Fusarium Wilt is commonly found throughout the United States, is a soil-borne pathogen. Plants susceptible to Fusarium Wilt are cucumber, potato, tomato, eggplant, pepper and beans. Fusarium wilt causes foliage to yellow, brown spots on leaves, leaves to curve the length of the leaf, wilt, then turn brown and die. Your plants become stunted because they can no longer function properly.

The list of plants susceptible to Verticillium Wilt is impressive. You might have thought it was just tomatoes, but look: Peanut, Horseradish, Rutabaga, Cabbage, Brussels sprouts, Pepper, Safflower, Hemp, Watermelon, citron Cantaloupe, honey dew, Pumpkin, Cotton, Okra, Mint, Radish, Rhubarb, Castor bean, Eggplant, Potato, Spinach, New Zealand spinach, SaIsify, Yard-long bean, Cowpea! Cucumber, tomatoes and strawberries are particularly susceptible.

Verticillium wilt is most active in humid climates. Cool nights and moist conditions, the kind that favors peas, tend to encourage it. It lives in the soil, entering plants through the roots and is drawn up to stems, leaves and fruit through water uptake. At the same time, it is robbing the plant of moisture. The first symptoms of verticillium are usually seen in wilting, yellowing and curling leaves. Discolored streaks are often seen in strawberry stems and runners, and in berry canes.

To determine if a plant is infected with bacterial wilt, press together two freshly cut sections of a stem and slowly pull them apart. If a “stringy” sap (bacterial growth and associated resins) extends between the cut ends, the plant has bacterial wilt.

Especially Tomatoes! And of those, Heirlooms are particularly susceptible to the wilts. Instead, get varieties that have VFN or VF on the tag at the nursery. The V is for Verticillium, the F Fusarium wilt, N nematodes. Ace, Early Girl, Champion, Celebrity, are some that are wilt resistant/tolerant. In these drought conditions, consider getting only indeterminates. In the Mother Earth News tomato survey, they found gardeners chose heirlooms over hybrids if their soil is wilt/blight free. Otherwise, the longer the gardener has gardened, they more they chose wilt resistant toms if their soil has the fungi.

Western striped cucumber beetles are deadly to cucumbers. They are referred to as ‘plant-wounding insects’ and also transmit bacterial wilt. Feeding on blossoms and leaves, they carry the wilts and also spread it among squash, melons, and pumpkins. Cucumber beetles also vector viruses such as cucumber mosaic but do so much less efficiently than aphids. Spiders are one of the predators that eat the beetles. Let those spiders live! A tachinid fly and a braconid parasitoid wasp parasitize them. Grow plenty of flowers for these beneficial insects!

Radish have become my new religion! Radish repel the beetles! You do have to plant your radish ahead of installing your transplants or have it up before the seedlings start growing from seed. Grow your radish companion along where you will let the vine travel. The part of the vine growing up over an arch won’t be helped, so if you have space and infected soil, you may opt to keep your vines on the ground. Plant enough radish so you can eat some, but let  some grow out so the whole plant is big and protecting your cukes and other vines. Broccoli also repel cucumber beetles. Grow cucumbers under over summering Broccoli. Put in plenty of straw mulch to keep the brocs cool and the cukes off the ground. Whenever you see these beetles don’t fall for how cute they are. Squish.
Transplant rather than direct seed! Tiny seedlings are most susceptible to cucumber beetle feeding damage and to bacterial wilts.

Washington State Extension says:

Apply straw mulch! Straw mulch can help reduce cucumber beetle problems in at least 3 different ways. First, mulch might directly slow beetle movement from one plant to another. Second, the mulch provides refuge for wolf spiders and other predators from hot and dry conditions, helping predator conservation. Third, the straw mulch is food for springtails and other insects that eat decaying plant material; these decomposers are important non-pest prey for spiders, helping to further build spider numbers. It is important that straw mulch does not contain weed seeds and to make certain that it does not contain herbicide residues which can take years to fully break down.

Cucumber Beetles have their preferences! Bitter is their favorite. Not interested in watermelon at all, but watermelon does get the wilts, just from other sources! Anyway, see more details and rankings of varieties of different kinds of veggies. Varieties make a huge difference.

Special Planting and growing tips! 

  • Regarding soil fungi like Fusarium and Verticillium wilts/fungi, how you care for cukes and toms is super important! Cucumbers are even more susceptible than tomatoes to the wilts fungi, die pretty instantly, in about 3 days, if they get infected. So when you plant them, treat them similarly to your tomatoes if you have wilts fungi in your garden.
  • Plant cukes and toms on a raised mound/basin with the bottom of the basin above the regular soil level. This allows good drainage. Top that with a 1/2″ of compost, cover that with only 1″ of straw to let in air and sun to dry the soil. Keep the LEAVES OFF THE GROUND from the get go. Leaves touching the soil is the main way toms get the wilts. Remove lower leaves that might touch soil when weighted with dew or water from watering. Keep a regular watch for new foliage at ground level and remove it. AVOID WATER SPLASH when watering at ground level. The fuzzy damp leaves of toms and eggplant are perfect fungi habitat.
  • When they are about a foot tall, water neighboring plants, but not your toms.  That keeps the soil drier near your plant, so the fungi can’t thrive there. Since toms have a deep taproot, they will get plenty of water from what you give neighboring plants. Water near them but not at them or on them. In fact there are farmers who dry farm tomatoes! Read more!
  • If you are comingling beans with cukes lower along a trellis, plant the beans between the raised cucumber mounds. Beans don’t get the wilts, but love the water, so lower is good. They are a big plant with continuous high production and short roots that need to be kept moist. Mulch ASAP with straw under cukes to keep leaves and fruit off the ground, and out of the insect zone. Put a stake in the middle of the basin so you know where to water when the leaves get dense. Water gently below the leaves at ground level, no splash. Keep those leaves dry. When your plant gets bigger you can remove lower leaves.
  • Since the fungi are airborne as well as soil borne, plant in different places as far apart as possible. Plant so leaves of one plant are not touching another plant. Remove sickened foliage ASAP to reduce fungi population and slow spreading. Prune on hot, dry, unwindy days, mid morning to midday, after dew has dried, so cuts can dry and heal with less chance of airborne fungi getting into them. Try not to touch the cuts after they have been made.  Use clippers for a clean cut. Wash your tools and hands often.Trimming away infected leaves is a sad and tedious process. It’s practically impossible not to spread the fungi as your touch leaves that have it and try to remove them without touching any other stems or leaves. The very cuts you make are open to fungi. Then, naked stems are susceptible to sunscald – see image below. You come back a few days later and more leaves are wilting. The disease is internal, has spread out to the leaves. At some point soon after that, a lot of gardeners pull the suffering plant. It’s done. Not good to leave it and let windborne fungi infect neighboring plants.

    Do not compost infected plants or trimmings. The fungi has amazing survival ability and being soil borne, it is right at home in your compost. Put it in the trash, carefully bagged so as not to spread or leave any trace. Wash your hands. If you can, burn the infected plants.

  • The wilts can’t be stopped. Sooner or later the plant leaves curl lengthwise, get the dark spots, turn brown then blacken and hang sadly. Plants can produce but the fruit doesn’t ripen properly if it does produce. It’s agonizing to watch. Sometimes they somewhat recover later in the season after looking totally dead. You had stopped watering them, summer heat dries the soil and kills enough of the fungi for the plant to be able to try again. But production is so little and fruits don’t ripen properly. It’s better to pull it, reduce the fungi population that can blow to other plants. The safest bet is to remove the entire plant. Get all of the root as best you can. The root is where the wilt’s mycelium first congregate and infected roots left in the ground will start the whole process again. Replant in a different place if possible.

Tomatoes pruned to remove diseased leaves of Fusarium and Verticilllium wilts are susceptible to sunscald.Preventive Foliar Mix that can help! 

Apply to newly installed transplants, and during the season every 2 to 3 weeks, so new growth will be covered. Wet both the undersides and tops of leaves. Per gallon add:

  • One dissolved regular strength aspirin
  • 1/4 Cup nonfat powdered milk
  • Heaping tablespoon baking soda
  • 1/2 Teaspoon mild liquid dish soap

After the tomatoes set, add some nitrogen. Boost your plant’s immune system with some worm castings at the same time. You don’t want to add too much nitrogen to your tomatoes before they set fruit. Too much nitrogen before fruiting leads to more leaves and less fruit. Add N only once. Stressed plants are the most susceptible to the fungus. Water regularly and deeply. Use well-balanced, slow-release organic fertilizers that aren’t overly heavy with nitrogen. A healthy plant tends to fight off the spores.

Blight can also be transmitted through seed, so NO seed saving from infected plants. Fresh seeds and resistant varieties are in order.

Remove volunteer tomatoes and potatoes. If they are a not a resistant or tolerant variety, when they get sick, they increase the chances of your resistant varieties having to fight harder to live, and your good dear plants may not win the battle.

Air circulation, plant staking and no touching. Air circulation allows the wind to blow through your plants. This allows the timely drying of leaves and it helps break up micro climates. If your plants are packed too tightly together, they themselves become barriers to drying. Staking your plants to poles and using cages helps them grow upright and it creates gaps between the tomato plants. You want wind and sun to reach through and around your plants. Moisture is needed for fungi to spread. Dry is good. Tomatoes should be planted with enough distance that only minor pruning is needed to keep them from touching each other.

Spray proactively. Wettable sulfur works. It is acceptable as an organic pesticide/fungicide, is a broad spectrum poison, follow the precautions. It creates an environment on the leaves the spores don’t like. The key to spraying with wettable sulfur is to do it weekly BEFORE signs of the disease shows. Other products also help stop the spread. Whatever you select, the key is to spray early and regularly.

At the end of the season remove all infected debris, don’t compost. Don’t leave dead tomato, eggplant or peppers in the garden to spend the winter. Pull weeds because spores can over-winter on weed hosts. Many weeds, including dandelions and lambsquarters, are known to host verticillium wilt. During our winter season, turn your soil about 10 inches deep. Let the soil dry and the fungi die. Burying the spores helps remove them, it disturbs cucumber beetle eggs and exposes snail eggs to die!

If you have space, crop rotation is an important tool in fighting wilt. If you’ve had trouble with wilt, don’t plant potatoes, eggplant, or other solanaceous vegetables where any of them have grown for at least four years.

Practice prevention, be vigilant. If you don’t have wilts in your soil you are so blessed! 

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The Green Bean Connection started as correspondence for the Santa Barbara CA USA Pilgrim Terrace Community Garden. All three of Santa Barbara city’s community gardens are very coastal. During late spring/summer we are often in a fog belt/marine layer most years, locally referred to as the May grays, June glooms and August fogusts. Keep that in mind compared to the microclimate niche where your veggie garden is. Bless you for being such a wonderful Earth Steward!

Love your Mother! Plant bird & bee food! Think grey water! Grow organic!

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Sunflowers at Pilgrim Terrace Community Garden, Santa Barbara CA

The Next Three Months….

August is keeping your soil water absorbent, sidedressing, harvesting, plant a last round of summer favorites, start cool-season seedlings, time to preserve your abundance for winter eating, to take stock and make notes for next year’s summer planting!

September is exciting because it is the first month to plant fall veggies!  Do your final harvesting, preserving, clean up, chop and compost, and plant on Labor Day weekend!

October is considered by many to be the best planting month of the year!!  Time to take up strawberry daughters (runners) for November planting, clean up to break pest and disease cycles, plant your winter veggies, plant more veggies if you started in September!

…but specially in August:

Plant another round of your summer favs if you want, but keep in mind that Sep/Oct are the best fall planting months, so check those dates to maturity!  The sooner you start your winter plants, the faster start they have, the sooner you have winter veggies.  Things get slower as it gets cooler, so a head start makes sense.  And, heat lovers started now will have a shorter harvest period.  Just saying.

Watering:  Keep your veggies well watered, daily on extra hot days.  Seedlings may need water 2 to 3 times a day!  Keep strawberries moist or they will stop producing.  It tomatoes dry out, they drop their blossoms.  Water short rooted plants, beans, lettuces, cukes, more frequently.  They like lots of water, steady water! 

Mulch short rooted plants, beans, cukes, lettuces and strawberries, and deeper rooted chard, to keep them cool and moist.  More about summer mulching.

Feeding:  Get out your fish emulsion, get some manures, and feed your plants!  Foliar feed with compost, manure, worm casting tea.  Epsom salts your peppers.  Seabird guano (NOT bat guano) keeps plants flowering and producing!  See about aspirin in my upcoming 8.11.11 post!

Harvest like crazy!  Be thorough to keep your crop coming, and be gentle to keep your plants undamaged so they aren’t open to pests and diseases.  Be specially careful around your trellised or caged cuke’s brittle leaves.  You can hear them snap if you push against them too much or accidentally back into them.

Save seeds from your very best plants!

Pests and Diseases:  Stay with your prevention programs, and clear away debris, spent or unhealthy plants.  Mini tip:  Keep a 5 gal bucket, or wheel barrow, near you to collect debris as you work.

Prep your fall beds!

  • Start making compost for fall planting.  Chop into small pieces for faster decomposition.
  • Set safe spots aside for seedling nurseries.
  • Install gopher wire barriers in your new planting beds, redo an old bed.
  • Incorporate manures, worm castings, and already-made compost into your soil.
  • Top with mulch, maybe straw mixed with nitrogen rich alfalfa, to keep feeding your soil and keep the under layer moist.

Get the best varieties of seeds for starts now for Sep/Oct planting, or to put in the ground then!

Let strawberry runners grow now.

Enjoy your harvests!  Preserve or Give Away your bounty!

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Yummerlicous basket of summer veggies grown near Mahanandi, a peaceful temple town in India.  Indira and her Husband Vijay share the traditional recipes of their families.  Brinjals, btw, are eggplants!

Each of your plants has special harvest needs and techniques to get continuing excellent returns! 

  • Be gentle in closely planted areas.  Leaf damage opens your plant to diseases and pests.  Breaking off new tender shoots stops that point of growth.
  • Harvest when your plants are dry, before you water, to reduce disease spread.

Beets  Pull when they are small and tender.  Steam the leaves too.

Broccoli  Though thought of as a winter crop, All Season brocs are perkin’ right along, prolific with side shoots!  Keep them picked to keep them coming.  Get them to the fridge ASAP because they wilt fast.

Cantaloupe is ready when it ‘slips’ from the plant – no pulling, it just comes off in your hand.

Corn is ripe when the silks turn crispy brown, and the juice is white when you pierce a kernel with your finger  nail.  Corn pretty much comes in all at once.  Get ready to feast, invite friends!  Corn turns starchy immediately, so get it to the fridge, or into that boiling water ASAP!  Cut the kernels off the cob to sprinkle over salads, freeze for winter stews.

Carrots  Poke around with your finger to see if the shoulder, the top of the carrot, is the size you want.  Loosen the soil with a spade fork if necessary, pull, rinse, eat!  I mean take them home to share with your family!  If they are hairy and forked, your soil was too rich.  If the shoulders are green, they needed to have been covered with soil.

Cucumbers!  Harvest at will.  Your choice, but big ones can be seedy.  And if you wait too long, the plant thinks it’s done and stops producing.  Harvesting smaller is better.  Keep your cucs well watered – they make a watery fruit.  Pickle some!  Grow dill beside them to be ready for pickling.

Eggplant, Aubergine.  Shiny.  When they are shiny and they don’t spring back when you press them.  The more you clip, the more you get.  Another no-store-on-the-plant!

Green Beans  Or any kind of bean!  Pick, pick, pick, carefully so as not to damage your plant, to keep them coming!  Pick when the leaves are dry, so you don’t spread diseases, and before the pods get bumpy.

Lettuces  Crisp summer lettuce salads hit the spot!  Pick the leaves last, just before you head for the fridge.  Keep taking the lower leaves.  If your plant starts to bolt (grow upward), take the whole plant right away unless you want it to seed for you, otherwise, it’s compost.

Peppers!   When they are big and they’ve got that great pepper shape!  Peppers have a specific number they reach and they won’t make any more until you pick some!

Radish  Keep them well watered for fast growth, pull before they split.  They are usually a bit hotter in summer.

Summer Squash (zucchini, crookneck, etc.)  Cut them off at your preference, but when it’s hot, keep a watch under those leaves!  Giant squash sap the strength from your plant and keep younger fruit from developing.  Harvest small for salad slices.  When you find a giant hiding, use it for stuffing and baking.  If you are getting too many, pick the blossoms off to slow them down; eat the blossoms!

See ALL about SQUASH at On The Green Farms! 

Tomatoes!  Red on the vine, before the bugs, birds or mice get them.

Watermelon  When the tendrils start to dry and the bottom of the melon turns creamy color.  If it makes a dull sound when you thump it, it’s overripe.

SEEDS!  Seeds are another kind of harvest!  Let your best plants flower and seed.  Collect those seeds for planting next year!  But not the seeds of hybrids or corn unless your corn in no way can hybridize with anyone else’s corn!

Preserve!  If you have a great abundance, start preserving!  Dry, freeze, can!

Share!  Have extra tomatoes, beans, cukes, zuchs, and you don’t have time or inclination to preserve?!  Share your abundance! Here’s how!

  • Give to Pilgrim Terrace residents!  Take your veggies to the office 8 AM to 5 PM (Modoc/Portesuello).  They watch the garden for us, so it’s good payback!  The elders really appreciate fresh veggies and herbs!
  • Santa Barbara County’s Foodbank  Drop off M-F 7 AM – 3:30 PM at  4554 Hollister Av.
  • Share at weekend Neighborhood Food Exchanges!  Dates and locations  

Thanks for your generosity when so many really need your kindness.   Just a quick stop among your errands….

Organic garden-fresh produce can’t be beat!  Enjoy every life-giving luscious bite!

Next week:  August in Your Garden!

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July is not so much a planting month as water, sidedressing, harvest, and making compost – soil prep for September & October fall plantings! Get seeds!
August is keeping your soil water absorbent, sidedressing, harvesting, plant a last round of summer favorites, start cool-season seedlings, time to preserve your abundance for winter eating, to take stock and make notes for next year’s summer planting!
September is exciting because it is the first month to plant fall veggies! Do your final harvesting, preserving, clean up, chop and compost, and plant on Labor Day weekend!
October is considered by many to be the best planting month of the year!! Time to take up strawberry daughters (runners) for November planting, clean up to break pest and disease cycles, plant your winter veggies, plant more veggies if you started in September!

Tomato-Hot Juicy July!

Plant another round of your summer favs if you want, but keep in mind that Sep/Oct are the best fall planting months, so check those dates to maturity! The sooner you start your winter plants, the faster start they have, the sooner you have winter veggies. Things get slower as it gets cooler. And, heat lovers started now will have a shorter harvest period. Just saying.
Watering  Keep your veggies well watered, daily on extra hot days. Seedlings may need water 2 to 3 times a day! Keep strawberries moist or they will stop producing. It tomatoes dry out, they drop their blossoms. Water short rooted plants, beans, lettuces, cukes, more frequently. They like lots of water!
Mulch short rooted plants, beans, lettuces and strawberries, and deeper rooted chard, to keep them cool and moist. More about summer mulching.
Feeding  Get out your fish emulsion, get some manures, and feed your plants! Foliar feed with compost, manure, worm casting tea. Epsom salts your peppers. Seabird guano (NOT bat guano) keeps plants flowering and producing!  Blood meal is a quick Nitrogen fix for yellowing leaves.
Prep your fall raised beds! Start making compost for fall planting. Chop into small pieces for faster decomposition.
Install gopher wire barriers in your new beds. Incorporate manures and already-made compost into your soil.
Get the best varieties of seeds for Sep/Oct planting!
Let strawberry runners grow now.
Harvest!
Do keep up so your plants keep producing.  What you can’t eat or preserve, give away!  It will be so appreciated!

I’m passing this along from a Linda Buzzell-Saltzman, Santa Barbara Organic Garden Club post:

This article is by Robyn Francis, one of Australia’s top permaculturists.  She’s also a pioneer in rethinking international aid.

“While mental health experts warn about depression as a global epidemic, other researchers are discovering ways we trigger our natural  production of happy chemicals that keep depression at bay, with surprising results. All you need to do is get your fingers dirty and harvest your own food.  “In recent years I’ve come across two completely independent bits of research that identified key environmental triggers for two important chemicals that boost our immune system and keep us happy – serotonin and dopamine.  What fascinated me as a permaculturist and gardener were that the environmental triggers happen in the garden when you handle the soil and harvest your crops…”

Smile and be wild!
Cerena

Next week, Composting Made EASY! 

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