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How Long Do Systemic Sprays Last On A Plant ?


By Louise1

Somerset, United Kingdom

When i went to buy another fungicide yesterday one of the containers stated that the systemic action was effective for 14 days.

Is this normal for systemic sprays (of any kind) to only last this short period ?

I'd always presumed that systemic effects (of all kinds)were long lasting, have i been missing the point all these years ?



I think the various products vary a bit, but 14 days is about right, I'd think - that's a lot longer than the few seconds that a non systemic spray lasts Louise!

14 Oct, 2009


I would have thought that 14 days was long enough especially in the growing season, the plant would absorb sufficient to fend off nasties in that time.
I'm no expert but I think that's what systemic means.

14 Oct, 2009


This has really surprised me.
I had always thought the effects to be long lasting .... months rather than days !

It 'does' explain though why the effects aren't as good as i expected on these various things.

I've not been applying things often enough :-(
What a fool.

14 Oct, 2009


lol, Louise - you're not a fool, you just didn't read the bottles. Even a plant's "blloodstream" will eventually clean itself of all substances, if you think of it that way, and 14 days is a pretty long time for it to be in the system.

14 Oct, 2009


Well i've certainly learned a lot here, thank you.

14 Oct, 2009


Systemic sprays do last longer than 14 days, many cheaper ones are weaker in the solution. In the past we used Tritox on Cinerarias, which covered the life of the plant. Application should be in moist conditions, when heavy rain (overhead watering) is not forecast.

14 Oct, 2009


systemic' 1'of or relating to a system as a whole' 2' physiology denoting the nonpulmonary part of the circulatory system' 3'of an
insecticide, fungicide,ect,linguistics of grammar based on the conception of language as a network of systems determining options from which speakers make choices. there you are 14 day's lol

15 Oct, 2009


I did know the meaning of systemic.

I did not know the life of it within the plant.

15 Oct, 2009


I've just checked my Roseclear, Louise, and it is a fortnight for that one too - now I recall spraying roses fortnightly when I was working all the time, and that'll be why.

15 Oct, 2009


Yes, you need to spray fortnightly to keep up the strength of the systemic. Many Aphis and other garden enemies become immune to these chemicals. The main object of spraying against pests is not to get toxic chemicals in the food chain i.e if spraying Chrysanthemums next to potatoes the drift of the spray can be absorbed in the potato leaves.

16 Oct, 2009

How do I say thanks?

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