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Posts Tagged ‘floating row cover’

Bagrada Bug Stages
California, Nevada, Arizona, New Mexico, Texas gardeners alert!

June 2016 note: We were so fortunate last summer. We had hot weather but not for an extended time, so no Bagradas. The word from hot San Diego community gardens is they are simply not allowed to plant any Brassicas.

The extended Santa Barbara area hot spell at the end of August 2014 brought Bagrada Bugs. Ugh. They were sighted on radish, broccoli and kale at Pilgrim Terrace Community Garden. Bagradas thrive at sustained temps 85 degrees and above. They are small, less than a 1/4 inch length, but deadly. Other than seeing them, the first sign is your plant leaves have whitened areas at the leaf edges and the leaf starts to wilt.

Per Wikipedia, Bagrada Bugs are native to much of eastern and southern Africa and parts of southern Europe and Asia. They made a sudden appearance in Los Angeles in June, 2008, its first sighting in the Western Hemisphere. It then moved into the cropland of the heavily agricultural Coachella and Imperial Valleys of California, doing damage to cole crops there, especially those grown organically. As of September 2014 it has reached as far north as San Mateo, Santa Cruz, Merced and Inyo counties, and all California counties to the south except Tulare County.

Although spiders and other general predators may feed on the Bagrada bug, it does not have specific natural enemies in the United States. Birds don’t eat these nasty stink bugs.

The only effective substance, so far, that kills them, is one you have to have a license to use.

Brassicas are their favorite food, and Brassicas, that’s broccoli, cauliflower, collards, kales, Brussels Sprouts, cabbages, are THE SoCal winter garden plant! Last year, late summer, they also infested our tomato and pepper plants.

  • Per UC IPM, as an alternative to greenhouses, screened tunnels or floating row cover fabric can provide plant protection in gardens. The mesh of the screening material must be fine enough to exclude the Bagrada bug nymphs and should be elevated so that it does not touch the plants because the bugs can feed through these coverings. The edges of protective covers must also be buried to prevent the bugs from crawling underneath to the plants, and they must be applied before Bagrada bugs get into the crop and soil.
  • If you are planting Brassicas from seed, immediately securely cover with a floating row cover or the baby plants will be eaten.
  • Some gardeners plant mustard and radish as trap plants, the Bugs go there first. But, believe me, they quickly mow those and it’s on to your other Brassicas and more! The big CON of trap plants is they BRING Bagradas! The best course of action, to prevent egg laying and further infestation, this year and next, is to harvest, then remove any Cruciferous plants – mustard types, radish, all Brassicas, until the weather cools. Then, plant whatever you want!

Insect - Bagrada Bug infestation on Bell Peppers
Bagrada Bug infestation on Bell Peppers

Removing Bagradas from your plants just isn’t feasible. Not only do they move FAST and instantly drop to the ground when the plant is disturbed, but are fast growers and reproducers. They make virtual swarms, and when they suck juices from your plant, toxic disease producing stuff gets in your plant. In hot temps, I’ve seen a 1 1/2 foot tall plant go down in 1 to 3 days. White patches start on the leaves, they wilt and the plant dies.

PLEASE Remove infested or diseased plants immediately. You can’t even sneak up on Bagradas to cover the plant with a plastic bag. The moment the plant is disturbed, the bugs instantly drop to the ground, skittering off in the blink of an eye. Squish or stomp any bugs you see. DO NOT lay the leaves or trim of infested plants on the ground. Bagradas lay eggs both on your plant and in the ground. Eggs you might not see, hatch quickly, defeating your clipping. If possible, securely tie plant and bugs in a plastic bag so they can’t escape, and take them to the TRASH. Do not put them in compost or green waste.

Simply shaking Bagradas off doesn’t work. They also fly. When you try to remove them, they are expert at playing dead, and once you are gone, quite quickly climb back up on the plant. I’ve seen it. Stand very still and wait…sure enough, there they come. That’s your second chance to remove, euphemism for kill, them. But, like I say, better to immediately harvest anything you can, then remove the plant.

Don’t lay down mulch; do REMOVE mulch habitat from around infested or susceptible plants until the Bagrada season is OVER. They hide out in mulch, mate like crazy, lay eggs in the ground.

The sooner you remove infested diseased plants and mulch habitat, the fewer eggs will be laid in your soil, the fewer Bagrada Bugs you will have next year if we have another sustained period of high temps.

PLANTING TIPS

  • I highly suggest biodiversity, interplanting – that’s mixing it up, even interplanting different varieties of the same plant (especially broccoli), rather than monoculturing – a row of a single kind of plant. With rows of a single plant, the pest or disease simply goes plant to plant and you lose the whole row. This also stops leafminers (typical on overwatered soft leaved chard & beets) from going plant to plant. Slows them way down.
  • Plant so mature plant leaves don’t touch! Stop the ease of transmission. If you can’t help yourself, and go monoculture or plant too close, thin out plants as they mature, clip back, harvest the between leaves so they don’t touch. More is not always better. Dense plantings can literally starve plants that get root bound, that have less access to a healthy allotment of soil food and soil organisms that tickle their roots. Jammed together leaves are not able to get the sun power they need, so there are smaller leaves and less and smaller fruits. Slugs and snails successfully hide out. Mildew and leaf miners spread easily and can ruin the crop. There are so many reasons to give your plants ample space to live and breathe.
  • Unfortunately, Brassicas don’t mingle with mycorrhizae fungi. With other plants the fungi network linking your plants is proven that when one plant gets a disease or pest, it warns the neighbor plant. That plant then boosts its own defenses! No such luck with Brassicas.
  • Wait to plant your Brassicas from transplants in October when the weather has cooled.

Here is the link to some additional really excellent information at UC IPM (Integrated Pest Management) published Jan 2014. Read it very carefully.

You have choices!

  1. For now, plant what Bagradas don’t care for. Wait until the weather cools, plant Brassicas from transplants in October. Greens are super healthy ~ just don’t plant cruciferous plants (plants with four-petal flowers/cross) like Mizuna, mustard or turnips. Better not to get those mixed mesclun 6 packs at this time.
  2. Take a chance, mix it up! Plant a few Brassicas/mustard/radishes here and there now. If these plantings fail, plant another round when conditions have changed. Succession plantings are a wise gardener technique!
  3. Don’t plant over winter; rest your soil, or plant soil restoring cover crops!

Keep a good watch. Steady yourself. Make calm decisions. What you do is especially important if you have neighbor gardeners who have plants that may become infested.



9.1.2014 Post revised and updated from experience 

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Poly Floating Row Cover - slits for daytime ventilation. GreenHouseWorld.com

Have you ever used these?  Why not?!  Your family never did?  The cost factor?  They sound great!  They’re not just for big farmers, you can get them from nurseries and most seed catalogs!  I’m going to give them a try this year.

USES  Use for warming your plants both for starting spring crops early, and to ripen finishing fall fruits.  Use for frost protection, spring and fall.  Keep away harmful insects that eat or lay eggs, spread viruses.  Keep out birds and bunnies.  A caution:  ‘Colorado State University entomologists have found that overwintering insects can be trapped under the covers next to their favorite plants and be ready for action in spring. Some of these insects are tomato hornworm, onion and other root maggots, flea beetles and the [Colorado] potato beetle. Cultivate the soil before planting to reduce the number of surviving insects. Better yet, rotate crops so the survivors do not find their favorite plants nearby.’  OK?

How they work!  If for heat and growth, lay down black plastic mulch for soil warming and weed prevention. Make your slits in the plastic, plant. Put on your row cover. You can put it over hoops, over tomato cages or wires like hardware cloth bent into an arc, tented, or laid right on your plants, installing enough so your plants have room to grow up underneath. Anchor it well so no marauders can walk under or slither in. You can water right through it. Cover a row, or cover your entire raised bed!  If you are using the garden cloth row covers for freeze or grasshopper prevention, don’t let the covers touch your plants.  Since they are good both to keep your plants warmer when planting early, and help with cool weather frosts and freezes, this is one time you can have it both ways!  🙂

They come in lots of varieties – ask questions, shop around.  Select for your needs.  Get a rig that’s easy to lift for tending, and harvesting, especially if you use them to protect your strawberries from birds.

Garden Cloth, easy to install at home using tomato cages - U of Maryland Extention

Insect protection

  • The surest way to protect plants from hungry grasshoppers is to cover them with a barrier, such as a floating row cover or lightweight cloth. Be sure to hold the covers above plants with hoops or stakes, because grasshoppers are more likely to eat their way inside if leaves are pushing against the fabric.
  • Beets & Chard  Leafminers are the most common pest.  Cover plants with fine netting or cheesecloth or floating row cover to protect them from adult flies.
  • Effective in controlling cucumber beetles, squash borer and squash bugs.
  • Flea beetles on arugula, cucumber, eggplant, radish.

Double up under the covers!  Plant your main crop you want to protect, interplant with a smaller understory plant on the sunny side!  You might put in some eggplant with arugula and radish interplanted on their sunny side.

Remove and store when no longer needed! 

Lay right on your plants! Burpee.com

Danger of frost is past
The insect’s cycle is over.  Know your insect.
You no longer need more warmth
To allow pollination.  Especially melons, cucumbers and squash, that depend on insects for pollination. 

Sustainable.  Pesticides need to be applied weekly and/or after every rain, but with row covers they can be avoided completely.  Keep your soil clean, and our ocean safe.  Not only that, they save the time it takes to apply any formulas you may concoct, and if you are careful, you can lovingly reuse your row covers!  You can use them several times a year, per weather need, as different plants need protection as insects cycle, and next year too!  This is the best kind of ‘dirty laundry!’

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Harvest, Replant, Maintenance, Spring Preps, SEEDS! 

Keep harvesting!  Plant consideringly.  That means, summer planting starts in March.  January, February are generally cold, so slow growth though day length is getting longer.  Keep in mind what space you want available in March for the March starts.  If you are a winter plant lover gardener, one way to do this is to plant another round of your favorite winter plants, then in March designate a ‘nursery’ area, and start your summer seeds there.  Transplant the babies to their permanent locations as the spaces become available.  That in mind, plant more broccoli, cabbage, cauliflower, celery, chard, kale, kohlrabi, potatoes.  Plant an understory of all year favorites – beets, carrots, parsley, radish, and turnips, on the sunny sides of taller plants.  And LETTUCES!  They love January!

January IS bareroot month!  Start bareroot artichokes, short day globe onions, strawberries (if you missed November), asparagus, horseradish (Be warned! Invasive).  Depending on the weather, strawberry flowers may appear shortly after planting.  Remove them so more energy goes into root development.  Seascape, developed by UC Davis, is an everbearer strawberry that produces well in our moderate coastal climate most of the year. Sequoia is an large berried everbearer; Chandler is a June bearer – produces May/June, then done.  For those of you at home, plant bareroot cane berries, blueberries, roses, deciduous fruit trees!  Visit Bay Laurel Nursery in Atascadero!

Clear overwintering pest habitat, debris; weed.  Turn top soil to aerate and let the bad fungi die, pray for the good ones.  Sidedress your producing plants lightly – add some fish emulsion with kelp.  Sprinkle and lightly dig in cottonseed meal, alfalfa meal or fish meal.  Keep a weather watch; keep those old sheets and coverings about in case of hard freezes.  Farmers’ Almanac on Frost   Weather.com Frost Map  Make this one your home page during cold winter months.  No mulch this time of year; it keeps the soil cold.  Rain Tips!  Secure peas and tall plants.

If you have been growing favas, time to secure them from winds, rain.  Pop in a few stakes and tie them with that green stretchy stuff, or some twine.  If they have too much shade, water or fertilizer, they will go to leaf and no bean pods.  If that happens, pinch off the growing tips.  Take ‘em straight to your kitchen for steaming or stir fry!  Back at your garden, side-dress with a sprinkly organic box fertilizer or fish emulsion with kelp, or whatever your choice is, water well!  Takes about a week for the beans to appear.  Let them get 5 to 8 inches, filled with beans, and their yours – tasty and high in protein!  If you are growing for seed, let the pods blacken and dry.  Black?  Yep, I know, counter intuitive.

Make compost, start preparing your soil for spring planting.  Make raised beds.  Plan your spring garden; get seeds, wait until March to start planting your summer veggies.  Wait for it.  Plants planted out of season struggle with weather, day length, temps, and are susceptible to pests and diseases they aren’t naturally able to fend off.  Now, if you have a greenhouse….

No greenhouse?  Start Seeds Indoors – we are now the prerequisite six to eight weeks away from March!  Start tomatoes, marigolds, peppers, cosmos, zucchini, impatiens, salvia, basil, and others.  Especially start peppers!  They take longer than other veggies.  Otherwise, wait until all chance of freezing temperatures have passed and buy transplants at your favorite nursery.  I’ve seen zucchini started in the ground in January thrive.  If it doesn’t come up, no problem!  Put some more seeds in soon again!  Keep planting.  I haven’t seen it work with tomatoes, but Marshall Chrostowski of Pacifica Institute’s Garden starts his toms in January for late March picking!  He uses heat transmitting black row covers on the ground, and floating row covers above.  That’s clear plastic with holes over hoops.  They make the soil 15 degrees warmer, with 15-20% warmer air!  You can buy floating row covers at your nursery.  Give it a try! Eating garden fresh organic tomatoes late March?! Yum! Row covers will speed up your notorious slow-grower peppers too! Not only do floating row covers warm things up, but they keep flying pests away from your plants! Check out Digital Seed’s Planting Schedule!

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