We have a plum tree which last year was attacked by plum sawfly. I have found advice on the web which says dig the soil at the base of the tree to disturb the overwintering pupae and spray the blossom with derris. That however is no longer available. The only product I can find is from HSD ONLINE whose recommended their product-PROTECTOR NATURAL INSECT KILLING PRAY FOR ALL PLANTS but the instructions for use say it should not be sprayed on the blossom but as I understand it the flies lay eggs directly on the blossom from where the maggots then tunnel into the fruit so it would appear that using a product which can be sprayed onto the flowers is essential. What is your advice please?
Thank you. Richard Jones.
- 8 Mar, 2012