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- Title
Morphometrics and morphology of rice blue beetle (Leptispa pygmaea Baly) (Coleoptera : Chrysomelidae).
- Authors
Karthikeyan, K.; Jacob, Sosamma
- Abstract
The Rice blue beetle, Leptispa pygmaea Baly, reported earlier as a minor pest, is recently attaining the status of a major pest by causing much concern in several rice growing tracts of Palakkad,Kannur and Kasaragod districts in Kerala, India. Attempts have been made for the first time in Kerala to study the morphometrics and morphology of the beetle for its correct identification and management. The beetle was found to lay oval shaped eggs on the rice leaves and the egg measured 0.20 mm length and 0.12 mm width. The eggs hatched into creamy white grubs with two spiny projections on the head and two tubular projections on the posterior end of the body. The grubs had five larval instars and the head capsule of 1st, 2nd, 3rd, 4th and 5th instars measured a width of 0.17, 0.20, 0.23, 0.26 and 0.26 mm respectively. The grub pupated on the leaf and was seen attached loosely by its posterior end. The brown coloured pupa measured 3.89 mm (length) and 1.32 mm (width). The adult beetle was metallic greenish yellow in colour with longer antennae, narrow thorax and a long body. The female rice blue beetle could be differentiated by its shorter antennae, broader thorax and stouter body. The antennal scape was broader in the female compared to that of the male. The male reproductive system consists of aedeagus with two parts of tegmen and siphon.The aedeagus showed an average length of 1.36 mm and width 0.07 mm (anterior) and 0.10 mm (posterior). The female reproductive system showed spermatheca and two lateral coxites with an average length of 1.60 mm and a width of 0.52 mm.
- Subjects
KERALA (India); CANNANORE (India); INDIA; MORPHOMETRICS; RICE diseases &; pests treatment; BEETLES; CHRYSOMELIDAE; AEDEAGUS
- Publication
Journal of Biopesticides, 2012, Vol 5, Issue Sup, p202
- ISSN
0974-391X
- Publication type
Article