Interesting characteristic of malathion

olpea(zone 6 KS)August 4, 2012

Came across this detail in one of MSU's newsletters.

"Malathion sprayed on strawberry flowers decreased to 2.70 percent of the initial concentration within two days of application." [in hot weather]

I knew Malathion was short lived, but not that short. A 3% residue after only 2 days? No wonder multipurpose sprays that use Malathion are so ineffective.

(Don't know why the tests were done on flowers since you'd want to avoid spraying blooms.)

Here is a link that might be useful: MSU - Counteracting adverse weather effects on deposition and degradation of insecticides

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franktank232(z5 WI)

That is crazy. No sense in using something unless you plan on spraying daily.

Do you use Acetamiprid? If you do (or have used), what are your thoughts? I might try using it for PC next spring.

    Bookmark   August 4, 2012 at 1:48PM
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olpea(zone 6 KS)


I do use Acetamiprid (Assail). It's still classified as a reduced-risk pesticide and it is much less toxic to bees than some other neonics that are suspected to play a role in CCD.

I don't think I'd try it for PC though. It's not rated as good as the pyrethroids for PC. I had pretty good luck w/ my pyrethroid (Mustang Max) for PC. Had some PC damage on plums, but none on any other stone or pome fruits (that I've noticed).

Just harvested some Green Gage plums and saw a few PC scars (maybe 5%).

    Bookmark   August 4, 2012 at 5:41PM
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they probably tested on flowers b/c of the bees. depends on what different combo of plants you're growing, you can have fruit and blooms at the same time, and also pests that feed on sap/leaves during blooms.

i use the broad spectrum sprays in the evening as the sun is going down, to minimize exposure to the bees.

    Bookmark   August 5, 2012 at 10:54PM
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