A further note on an unusual correlation between insect damage and crop harvested

The unusual positive correlation between the yield of tea and damage caused by shot-hole borer beetles persisted during the third year from the pruning of the bushes even though the beetle attack fell to a low level. The diminished insect injury during the third year enabled a significant yield response to nitrogenous manures to be demonstrated. Methods of measuring beetle infestation are discussed, and the view is put forward that factors favouring growth, as reflected by crop, also favour the multiplication of the beetle.