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Foxtail Millet Problems: Birds, Lodging, Smut, Rust and Volunteer Seedlings

Very little eats foxtail millet while it is growing and a great deal eats it once the seed forms. Birds are the real threat, lodging is the second, and the seed you fail to harvest becomes next year's weed.

Birds will find it before you do

Foxtail millet is sold as bird seed for a reason. Finches, sparrows, buntings and doves will locate a ripening block within days of the seed reaching soft dough, and a small garden patch can be stripped in under a week by a flock that has decided it belongs to them. The heads are held clear of the leaves at a convenient perching height, which is helpful to you at cutting and equally helpful to them.

Netting is the only thing that reliably works, and the timing is the whole trick. Put it up when the heads emerge and are still upright, before the seed is worth taking, not after you notice damage. By the time you notice damage a feeding habit is established and the birds will work at the edges of any protection you add. Drape fine mesh over hoops or a frame so it stands clear of the heads; birds will feed straight through netting that is resting on the crop.

Scaring devices buy you a few days each and no more. Reflective tape, a hawk kite and a moving scarecrow all work at first and all stop working once the birds learn that nothing follows the movement. If you rotate between two or three devices every few days you can stretch that period, but on a crop that only stands ripe for two or three weeks, netting from head emergence is simpler and it actually works.

There is a legitimate alternative, which is to accept it. If you have grown the millet to feed birds anyway, plan a block to cut and a block to leave standing. A standing patch of millet through autumn and winter is one of the best bird feeding stations you can grow, and it costs you nothing except the honesty of deciding in advance which part is theirs.

Lodging, and how to read a flattened patch

A block of millet lying flat across the bed after a storm is the commonest failure of this crop after bird damage. The cause is nearly always one of four things, and the pattern of the collapse tells you which. Diagnose it while it is lying there, because the fix belongs to next season's sowing rather than to this one.

If the whole block is down evenly and the stems are bent rather than snapped near the base, the cause is soft growth from too much nitrogen. If only the windward edge and the corners are down, it is exposure and the answer is shelter or a string corral. If patches are down where the stand was thin, it is uneven sowing or thinning, and the fix is a higher, more even seeding rate. If the stems have snapped rather than bent and there are chewed or hollowed sections near the break, look for stem-boring caterpillars.

What you do about a flattened crop depends entirely on the stage. Down after the grain reached hard dough, the grain is already made; cut the heads within a day or two and dry them under cover, and you will lose very little. Down before flowering, the crop will not recover, since a bent grass stem does not stand up again and the heads that form will lie in the soil and mold. In that case cut the whole block, compost it, and use the rest of the season for something else.

Diseases worth recognizing

Foxtail millet is a healthy crop in a garden and most seasons you will see nothing at all. The diseases that do turn up are almost all favored by the same conditions: a dense stand in humid weather with poor air movement, or seed carried over from an infected crop. Because the plant lives only eighty days, spraying is rarely justified; the useful responses are removal, seed hygiene and a change to next year's sowing.

Smut is the one to know. Instead of seed, part or all of the head fills with a mass of dark powdery spores contained in a gray membrane that eventually splits. It is carried on the seed coat, so the worst thing you can do is save seed from a block where you saw it. Pull affected heads before the membrane breaks, bag them and take them away, and buy fresh seed for the following season.

Rust shows as small orange-brown pustules on the leaves that leave rusty powder on your fingers, and blast appears as gray-centered, brown-edged spots on the leaves that can spread into the neck of the head and kill it. Both arrive late in most gardens, which is fortunate, because a crop that reaches hard dough before either takes hold is essentially unaffected. Downy mildew is the exception: it distorts seedlings early and turns the head into a mass of leafy shreds instead of seed, and affected plants should be pulled as soon as you see the distortion.

ProblemWhat you seeWhat to do
Smut in the headDark powdery spore mass where seed should bePull and bag before it splits. Never save seed from that block
Downy mildewDistorted seedlings, head becomes leafy shredsPull affected plants at first sight, improve drainage
RustOrange-brown pustules that mark your fingersUsually too late to matter. Sow thinner next time in humid sites
BlastGray-centered brown leaf spots, blackened head neckRemove worst plants, avoid overhead watering, do not save seed
Head mold after rainGray or black fuzz on a wet, ripe headCut and dry the rest under cover immediately
Aphids on leaf undersidesSticky leaves, colonies in leaf sheaths, sooty moldHose off, encourage predators. Rarely worth spraying
Armyworm or stem borerRagged leaf edges, snapped stems with hollow sectionsHand pick at dusk, remove damaged stems

Avoid overhead watering once the heads have emerged. Wet bristly heads dry slowly, and almost every fungal problem in this crop starts with a head that stayed wet for a night. Water the soil, not the canopy, from head emergence onwards.

Volunteers, shattering and keeping it where you put it

Every ripe seed that hits the ground is a seedling next year, and foxtail millet shatters freely. A bed that carried millet will produce a flush of fine grass seedlings the following warm season, and they are easy to mistake for a weedy relative because they look very similar early on. They pull out without effort, but there can be a great many of them.

The way to keep the problem small is to cut at hard dough rather than fully ripe, to carry heads in a container rather than an armful, and to shake the cut stubble out before you compost it. If you have already lost seed to the ground, a shallow hoeing of the bed a few weeks later, once the volunteers have germinated in a flush, clears nearly all of them in one pass.

The same shattering behavior is what makes millet risky in a compost pile. Seed that goes into a cool heap comes out viable and gets spread wherever the compost goes. Either burn or bin the threshed heads and chaff, or make sure the material goes into a heap that genuinely heats through.

What to record about problems

Note the date the birds first appeared on the block relative to the date the heads emerged. That gap is remarkably consistent from year to year in one garden and it tells you exactly when netting has to be in place. Sketch which part of the bed lodged and mark the wind direction on the sketch; two seasons of that sketch will show you where the shelter needs to be.

Record any smut you found and in which bed, because that determines whether you can save seed and where you should avoid sowing millet next year. Note the volunteer flush the following season too, with a rough count, since it is the honest measure of how much seed you lost at harvest and it usually argues for cutting a few days earlier.

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