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The shot-hole borer (SHB), Xyleborus fornicatus Eichh. is a small, wood boring ambrosia beetle belonging to the family Scolytidae. SHB is considered as the most serious pest of Tea (Camellia sinensis var. assimica) in Sri Lanka and is of greater economic importance than the other teainfesting insects and mite pests put together 1 . Certain tea cultivars show a higher degree of susceptibility to this pest. The use of utilization of persistent insecticides such as DDT, dieldrin, aldrin and telodrin to control SHB has caused serious secondary pest outbreaks 2 . This paper deals with the potent activity of (+)-usnic acid against X. fornicatus.

Effect of (+)-usnic acid on the shot-hole borer (<i>Xyleborus fornicatus</i> Eichh.) of tea