Seven dust is death on bees , but if any of you get a nest of yellow jackets in a bad spot.use a squeezeable bottle to blow the dust in the hole, if it gets on a few, so much the better. They are history.
Sevin is still deadly after 3 days exposure and can kill up to 7 days. However you are correct that the liquid is less of a problem for bees than the dust. I will not use dust but I will use liquid spray under some conditions.
Beans are inherently less likely to be a problem because of the flower structure which protects the nectary from spray. By comparison, some corn growers spray when it is tasselling which is potentially a death blow to bees. The big problem is that bees can carry dust into the hive in loads of pollen and it retains its deadly capability for months.
I don't know the answer, but I think the best you can do is if you "have" to use it, use the liquid, and never spray anything that's blooming
I have a couple of cherry trees that are being ravaged by japanese beetles
it does no good to spray em at night, the beetles aren't there
I just gave up spraying this year, not sure what I'll do in future
Sevin is the company name, not the poduct. They make MANY products. Ask your dealer about the different ones and how they work. Some have short active times, some have long. I know very little about insecticides. I just know that the farmer where my bees are sprays his plants on a regular basis without harm to my bees. He saye it depends on what you use, how you use it, and when.
I've seen japanese beetles by the beans, but I think the bean beetles, their larvae (small yellow things) are what's stripped the leaves. I asked an organic gardner what to do about them and she recommended just plowing the beans, but then the crop is lost.
The man I bought my hive from is a gardner who sells his produce and keeps bees, has done both for years. I'm going to ask him about this tomorrow.
Obviously, it will, but I have a query: it is considered a contact killer, which means it gets on the victim and kills it. I wonder if it also mimics flower pollen. It seems that the label puts extra emphasis on the killing of honeybees, and I have often wondered why. Robert Gregory.
You folks should google "Spinosad", registered as a organic and works great on bugs that chew, not so much on piercing fruit type bugs tho but does a little. It works by coating the foliage and kills the bug when ingested, it can also kill when wet, so evening spraying to avoid bees is best.
Washes off when exposed to rain, or if you still water with some kind of over head spray.
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