Dormant Oil Spray
steve333_gw
10 years ago
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curtis
10 years agoRelated Discussions
What is dormant oil spray..Is it 'Organic?'.
Comments (3)I guess it depends on how tightly you define "organic". Dormant oils are highly refined petroleum byproducts, so you be the judge. They are considered to be somewhat 'enviro-friendly', however. They are used most often to smother overwintering insects and egg masses. There are other dormant season sprays that address fungal issues, often with a different oil base as sulfur (the most common fungicide) and petroleum based oils don't play well together and can cause phytotoxic reactions. If you are treating for worms that appear inside the fruit however, like apple maggots or coddling moth larvae, dormant sprays will be totally ineffective. In fact, there is no spray treatment registered for homeowners to use against these pests. Trapping with pheromone lure traps is the most effective control but requires consistent application/usage for several seasons to provide full control. These need to be hung and in place as soon as the blossoms appear as this is when the adult moths are present. Keep them up until harvest, reapplying the bait/lure as necessary....See Moredormant oil spray
Comments (7)Assuming you have a pure horticultural oil and not an oil/sulfur mix, then all you really need to know is that dormant oils and growing-season oils are really exactly the same thing and have been for the better part of a century. If the label on your oil recommends a more concentrated spray for the dormant season and a less concentrated spray for the growing season then once the leaf buds on your roses have started to open, use only the growing season concentration. Oil and sulfur mixtures are sometimes sold as dormant sprays. These can be very phytotoxic and the simplest thing is to not use them at all....See MoreDormant oil spray for grape vines
Comments (4)I put a copper spray on my grapes this fall. Mostly because it was already mixed up and going onto the peaches. That's for fungus and fungus doesn't give little cut marks. I do a dormant oil spray on the grapes in the spring. I don't worry about pruning the sprayed branches off because the dormant oil is really cheap. But you could prune first and then spray, as long as the unsprayed trimmings were removed from the property immediately. I like to dormant spray before the grapes wake up and I don't prune until the first buds at the end of the branches start to show color. What is it that you think is giving the little cut marks?...See Morelarge rose sawfly and dormant oil??
Comments (1)I don't know if or where the adults overwinter, but I believe the eggs are laid in the shoots, and the larvae emerge in the spring. If they were in the soil then dormant oil would be of no use. If your rose is beginning to leaf out, as the ones around me are, then an application of dormant oil right now will harm the leaves. It is supposed to be of some use in controling sawflies though, when used at the right time (before budbreak). So it might be something to consider for next year (unless you're a lot further north than I am). For now, handpicking of the larvae is quite effective if you are religious about it. Keep a tin of soapy water handy, and do a quick check as often as you are able, tin in hand. Pick the larvae off and drop them into the tin. Check the underside of the leaves. The larvae usually show up in mid to late May around me, but they might be a bit early this year because we've been so warm. BP...See Moremrsg47
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