Bt won't work on sawflies, as they are NOT the caterpillars of moths or butterflies. These insects can also be expected on currants, but they much prefer gooseberry. Keep you eyes out. Other products you can try would be insecticidal soap, a commercial product rather than home-brewed. Also, neem can be very helpful in controlling this pesky insect. And don't forget strong sprays of water right from the garden hose.

FINISH HIM!!!!! Sorry about your insect troubles... :<

I get this all the time Darren... they are something of a plague these days, and some of my roses will lose a few buds to them, but when you have a lot of roses, and they are established for a few years, you will get so many buds, that you won't notice the loss of a few so much. What I do is check some of my more vulnerable roses, the young ones with not too many buds, and check for leaf rolling, that's the one | get, the leaf rollers, you can spot them easily, and inside will be a little tiny caterpillar, but the rose bud will have been eaten... I don't spray so I can't recommend that kind of treatment. Vigilance is my weapon of choice.. sorry I can't be of any more help, you get used to it.. but it's annoying with young roses, I know that..

That’s interesting .. I already have some spinosad but didn’t realise, it is marketed here as a fruit fly control, see the blurb below. Nature’s Way Fruit Fly Control has been included in this range because it’s based on spinosad, the naturally-derived insecticide found in Yates Success. Yates Nature’s Way Fruit Fly Control works by tricking the insect into absorbing the spinosad that’s been combined with an irresistible bait. After she emerges from her pupal case in the soil, the female fly looks to feed on a source of protein before she lays her eggs. When she eats the protein and sugar bait in Nature’s Way Fruit Fly Control, she also ingests a dose of the insecticide, which means she never makes it to the egg-laying stage. Fruit fly baits are nothing new but many have used a hormone that only attracts male flies (they’re the ones that don’t lay the eggs!) or have been based on a nasty chemical. Now Yates Nature’s Way Fruit Fly Control has a low toxic formulation that really works. also found this because spinosad is highly effective against diamondback moth, but because it also controls several other important lepidopteran pests such as heliothis (Helicoverpa spp.), cabbage white butterfly (Pieris rapae), cabbage centre grub (Hellula hydralis) and cabbage cluster caterpillar (Crocidolomia pavonana) at rates which provide growers with excellent value for money. Spinosad is highly active against loopers (Chrysodeixis spp.) and affords some control of cluster caterpillar (Spodoptera litura) and onion thrips (Thrips tabaci). So so if my rose slugs ever start on my buds I’ll use this. Might even do it on the climbing nahema as I can only squish so high! And they do shred the leaves to pieces ...