questions: query regarding citrus trunk borer. 
 answers: for citrus: spray acephate 75 sp or carbaryl 2ml/2 gram per liter of water 3 times at 5 days interval in the evening time and then block the holes with cotton plug deep in kerosene. after that smearing of carbaryl with lime and water (3 gram carbaryl/liter of water) should be applied upto one meter from the base of the tree, which prevent the adult from laying eggs. dont harvest the fruit just after applying chemical please wait for minimum 1 week after application of chemical.