Crikey – it’s that time of year when everything wants to devour everything else! This time it’s gooseberry sawfly larvae, and our prized gooseberry bushes – it looks like a caterpillar, it moves a bit like one, but it’s actually a fly maggot – nice! They’re between 1-2cm long, and eat fast!
Our Answer to the Gooseberry Sawfly
Luckily for us, and unluckily for the gooseberry sawfly, we’ve been here before and on the same bush. It’s the earliest bush, and the largest and greenest – if I were a sawfly larvae I’d head straight to it, knife and fork at the ready. But we know the routine now – I immediately ordered three sachets of Namasys Natural Fruit & Veg Protector.
It’s easy to apply – wait for an evening, when rain isn’t forcast. Mix one sachet with 5 litres of water, if you’re applying with a knapsack sprayer or other type of sprayer, and give the affected plants a really good dousing of the spray mist. The liquid has to touch the sawfly larvae for the nematodes to enter the body of the larvae, so it’s important to get right under the leaves too, to make sure you nobble them all. Make sure you cover the entire plant, not just the eaten leaves as you can see in the video above. If you get them in time, fruit drop will be minimal and you’ll still get a decent crop. A week later, mix the next sachet up and repeat the process, and then again a further week later of the final sachet. The shelf life is limited, and they must be kept in the fridge, but so far this has been the best way for us to keep the sawfly under control, unless you like bleeding to death from the millions of cuts by pulling them all off by hand.
We should also point out that also check your red and white currant bushes, as they are also a member of the genus Ribes in the gooseberry family, unlike the black currant. To be safe, as soon as you begin to see leaves on your gooseberry bushes, check them as you walk past, near the base, as that’s where the sawfly larvae starts it mission upwards!