The Nemasys nematodes turned up on Friday, and the weather was cool and dull enough to spray today. I was a bit worried that they would not be sufficient for all our various trees, but I needn't have worried as the cordons are very easy and efficient to spray. The sachets had to be dissolved in 10 litres of water, but my sprayer only takes 3 litres so I had to make up 1 litre of concentrate and then fill up in three sessions. I now realise just what a boon cordons are, much easier to access and spray. The M25 standard Grenadier was a nightmare, and took half the treatment volume alone, so we've resolved to remove it in stages as there's absolutely no point in maintaining a large producer of inedible fruit that rots and poisons my poor poultry.
The second treatment should be done 5-7 days from now, exactly when will depend on the weather conditions. Only time will tell if this is an effective treatment though.