Question
There was a question on this website about this leaf blistering / nodules and the answer said they were caused by a nymph like creature that overwinters as eggs in thei dead mother.  My 2 year old pecan tree had a severe outbreak of this during the growing season.  The tree is about 8 feet tall now.  The answer said the tree could be sprayed, but didn't say with what.  Is malathion the treatment and if so, at what strength and frequency?  Thank you.

Answer
The pest you are referring to is most likely pecan Phylloxera.  The insect does cause galls on leaves, particularly at the terminals of branches and can cause the tree to abort all nuts if the infestation is severe.  The choice of treatments to control this pest is Sevin or Malathion.  The insecticide should be applied in the spring when the buds are swollen and leaves are just beginning to emerge.  The treatment needs to be made two weeks later in order to catch the fly (midge) as it tries to lay eggs.  If you miss this treatment schedule there will be galls on the leaves.  You may even want to treat a third time a week later.  You probably should add an all purpose fungicide into the spray mix.  A product like Daconil or Topsin M can be used on pecans to control pecan scab, a fungal disease that can also reduce yield.  Follow label instructions on each product for pecans.  You will be able to do this for a few more years and then the tree may become to large to reach the top.  This is a problem in the home garden situation, but there is not much that can be done for this.  Good luck.