We live on Macleay Island and have a lime and lemon tree both about 18 mnths old and most of the branches have these lumps in them that we have been told by a friend is gall wasp.What can we do to rid the trees of them or do we have to digs them out and buy new ones.They are both in a sunny position.
28 June 2019 08:46 AM
You have correctly identified the problem with your citrus trees. The lumps you are seeing on the stems are caused by a citrus gall wasp. Last September small black wasps would have laid their egges in the young soft twigs of your lime and lemon trees. You would have noticed swellings( galls) on the branches from Autumn onwards. Because the wasp will emerge from these galls in September/October, you will need to prune off and dispose of these infected branches before the end of August. If you don't do this then, the wasp will emerge and re-infect the tree by laying eggs in the new shoots. There is no need to buy new citrus trees. It will not harm them to prune off these branches. Once spring comes, it will be time to fertilise your lime and lemon tree. Use a good quality fertiliser such as Yates Thrive Natural Citrus & Fruit Pelletised Plant Food. It's enriched with Dynamic Lifter and has added nitrogen, phosphorus and potassium to give your fruiting plants the right balance of nutrients for their growing needs. Water the trees well, particularly during the hot summer months and apply a mulch around the tree to conserve moisture and stop the roots from drying out. Hope your trees over time will give you lots of juicy fruit.