Posted: 01/02/2015 at 19:24
Hi Sharon, just to be sure- your lupine are in the flower bed under the tree, right? Provado is a very strong product which is generally watered into the soil, not sprayed into leaves as such. It works by being absorbed into the plant's own sap system, so when sap suckers eat the plant, they die. I do recall reading on the back of my Provado bottle that it's for use in pots, rather than open soil. This is partly because in open soil, the Provado water is washed away and so won't be half as effective as in a container and also because manufacturers don't know how potentially harmful to other life this product is. It is lethal to aquatic life for example and also to frogs. The EU has banned it (UK didn't go ahead with ban though) as it has been shown to affect pollinating insects when they feed from nectar coming from Provado-treated crops.
This isn't to say that I disagree with using it at all, but if be very cautious and selective. I only use it on pots, watering only those plants that don't flower and in soil where I don't plan to grow any edibles, for example.
If you're planning to water it into your open soil bed, it won't be effective, in other words.
SB will and is very safe indeed.
I would try the ladybirds again to see if, like another person on here mentioned, you have better results this year, as well as cutting back overhanging bits of that tree.
The biggest problem with aphids, I have found, is that they are notorious at becoming resistant to spray insecticides anyway. So you could spray the entire tree, only to find they return...as happened to me on my roses. Whereas SB wiped them put!