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Ohio

when applying a contact Pesticide (like Talstar) or fungicide to the plants and then a day or 2 later you get a steady down poor of rain , how long would you guess most pesticides or fungicides will still be effective until it completely washes or wears off?

6/4/2009 6:45:53 AM

Ohio

Would you reapply it again after the rain stops, even if you applied it 2 or 3 days before the rain started?

Thanks,
Brooks

6/4/2009 6:47:54 AM

Jericho Vermont

If the Talstar drys completely before the rains it will have a normal half life. I believe it is more the ultraviolet that will break it down. I use Talstar and overhead water and have never had an issue.
John

6/4/2009 12:08:22 PM

milford, CT,

Brooks...I have used Talstar for 3 years..I overhead water 30 minutes a day...I do use Coco-wet sticker...I believe you get at least a week of protection out of it...Mark

6/4/2009 3:46:05 PM

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Once Talstar has dried it is water fast. That said, if the humidity is climbing in advance of a storm it might not always dry in time. Watch the humidity. Less than 60% is good.

Sunlight is the most degrading factor of bifenthrin & other pyrethroids.

Talstar used to be gauranteed 5 years when used as termiticide but the feds found it lasts for 7 years. Nurserymen use Talstar Nursery (on sand) mixed with the soil media is good for a year. Foliar applications in partial shade (ticks) last 28 days. In full sun we're probably only safe for 2-3 weeks regardless of precipitation or irrigation.

6/4/2009 4:17:59 PM

Ohio

Thanks alot for the info!

6/4/2009 7:45:27 PM

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Oh...don't forget that the vines are growing much faster than the chemicals break down. Whether fungicide or insecticide, new growth appears LONG before the effective residual ends. This is why I favor sprayng half strength twice as often as recommended especially during rapid growth phases on young plants.

6/4/2009 10:19:49 PM