Ectropis bhurmitra
Ectropis bhurmitra, the tea twig caterpillar, is a moth of the family Geometridae. The species was first described by Francis Walker in 1860. A widespread Asian species, it is found around Indo-Australian tropics from India, Sri Lanka and Hong Kong, Taiwan, Thailand, New Guinea to Australian Queensland and the Solomon Islands. Description. The wingspan of the adult is 3 cm. Its ground colour is fawn with a brown fasciations with complex patterns. A blurry dark blotch is found near the middle of each forewing. The caterpillar has a dull, pale yellow dorsum and fuscous ventral side with  pink suffusion. A rusty colour appears towards the posterior end. Setae arise from black dots. Pupation occurs within a silken cell woven between leaves. Biology. It is a polyphagous species. The caterpillar has been recorded from several plant species of many families. Host plants include "Bombax ceiba", "Terminalia", "Artemisia vulgaris", "Shorea", "Aleurites", "Phyllanthus", "Albizia", "Eucalyptus", "Lantana camara", "Sambucus", "Uncaria gambir", "Cassia", "Indigofera", "Leucaena", "Allium", "Eugenia", "Syzygium", "Champereia", "Grevillea robusta", "Anthocephalus", "Coffea arabica", "Elettaria cardamomum", "Camellia sinensis", "Gliricidia sepium", "Citrus", "Schleichera", "Theobroma cacao", "Taxodium", "Gmelina", "Vernicia montana" and "Tectona grandis". Caterpillars feed on the epidermis of tender leaves causing holes on  leaves. Mature caterpillars tend to feed leaves with small pieces started from margins and then eat the leaf entirely. They are mostly active during early morning and night. Control. It is a minor pest of tea. However, caterpillars can be removed by hand picking or other mechanical methods. Adults are attracted to light and pheromones. If the outbreak is heavy, insecticides such as trichlorfon, chlorfluazuron or tebufenozide can be applied to eradicate immature stages of the caterpillar. Using biological control, China has successfully experimented with viruses like nuclear polyhedrosis virus against larval stages.