. Cooperative economic insect report. Beneficial insects; Insect pests. - 858 Hosts: Rice is the most important cultivated host, but it has also been recorded on turnips, jute, sugarcane and wild rice. Wild grasses are alternate hosts. Life History and Habits: The eggs are laid singly on the upper surface of the leaf, each egg being inserted in the leaf tissue but almost exposed and easily visible. The egg hatches in 5-7 days and the larva mines between the upper and lower epidermis, forming a characteristic "blotch" appearance on the leaf. The larvae often emerge from the mines and
. Cooperative economic insect report. Beneficial insects; Insect pests. - 858 Hosts: Rice is the most important cultivated host, but it has also been recorded on turnips, jute, sugarcane and wild rice. Wild grasses are alternate hosts. Life History and Habits: The eggs are laid singly on the upper surface of the leaf, each egg being inserted in the leaf tissue but almost exposed and easily visible. The egg hatches in 5-7 days and the larva mines between the upper and lower epidermis, forming a characteristic "blotch" appearance on the leaf. The larvae often emerge from the mines and crawl to other parts of the leaf or to fresh leaves. Pupation takes place in the leaf after 15 to 17 days. Generally speaking, the pest is dependent on moist conditions and attacks rice that is submerged in preference to rice on higher land from which the water has run-off. Soft-leaf varieties of rice are more susceptible to damage than the hard-leaf varieties. There are 3 or 4 generations annually in Formosa. The adult overwinters in wastelands or grasslands. Description: The adults are small, 5 mm. from occiput to apex of elytra, metallic blue to black. Antennae are set closely together in front of head, with a small spine at the lower edge of basal antennal joint; no spines on antennal joints above. Prothorax with a single four branched spine (almost four single spines from one base) at each side in front and a single spine at each side behind. Prothorax otherwise unspined. Sides of elytra parallel, ends not truncate, numerous spines present. Larva flattened, white or yellow with black markings, first three segments broader than abdomen. Eggs oval, about 2 mm. long. (Prepared in Plant Pest Survey Section in cooperation with other ARS agencies.) CEIR 8(40) 10-3-58. Adult of D. armigera Figures (except map): Adult from Kalshoven, L. G. E. 1951. De Plagen van de Cultuurgewassen in Indonesie. Vol. II, pp. 515-1065. Damage and immature stages from Narayanan, E. S. 1953. Indian Fa
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