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Ant assemblages on cashew trees in the wet zone of Sri Lanka were recorded throughout three phenological phases from March to June in 2015. Baited trapping and hand collection recorded fourteen ant species in five subfamilies and species richness observed on each occasion ranged from 7 to 11. Absence of serious cashew pests was noticeable in the current phenological cycle. Oecophylla smaragdina (Fabricius) was the only species recorded on all trees. Number of O. smaragdina nests observed on the same cashew trees in the two plots was recorded from April to June in 2015 and nests of the species were observed only on large and medium-sized trees. The materials carried by O. smaragdina workers on cashew tree branches were also collected, preserved in 70% ethanol and identified as far as possible using a Low Power Stereo-microscope and various plant and animal materials carried by workers confirmed that the species is an omnivore and a generalist predator. In the current study absence of serious damages caused by the cashew insect pests even without any insecticide application might be due to the presence of ant assemblages on cashew trees.

journal of science of the university of kelaniya/journal of science of the university of kelaniya

Species Richness of Arboreal Ant Assemblages (Hymenoptera, Formicidae) and Frequency of &lt;em&gt;Oecophylla Smaragdina &lt;/em&gt;(Fabricius) Occurrence in A Wet Zone Cashew (&lt;em&gt;Anacardium Occidentale L.&lt;/em&gt;) Field in Sri Lanka