Studies on spatial distribution in the teak carpenterworm Cossus cadambae Moore (Lepidoptera, Cossidae).
The establishment of Cossus cadambae was studied in 3 teak (Tectona grandis) plantations at different stages of infestation in Kerala, India. A considerable number of trees in a plantation were affected during the initial stages of infestation. The intensity of infestation was low during this stage and not easily detectable. In the subsequent phase, already infested trees tended to be reinfested, while healthy trees were also attacked. As infestation progressed, further recruitment of attacked trees to higher scores of infestation intensity occurred. This phase was characterized by large-scale mortality of heavily affected trees. As more healthy trees were affected, the distribution of attack became more uniform throughout the plantation.