questions: query regarding control of trunk borer in lemon 
 answers: trunk borer: prophylactic smearing of carbaryl/ monocrotophos /quinalphos with lime and water (1:1:25) should be applied upto one metre from the base of the tree during march/april which prevents the adult from laying egg. once the hole is made, it should be spiked with wire to kill the grub and then the hole should be cleaned and plastered with wet soil.
prophylactic smearing with lime solution (1kg/10lt. of water) along with 50 ml monocrotophos and gum applied upto 1m from the base of the trees during march followed by injection of either 10ml petrol into the holes and sealing with mud and cowdung plastering for effective control of trunk borer.