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Economic Injury Level for Sorghum Earhead Bug, Calocoris angustatus Lethierry in Southern India*

  • N. Natarajan (a1) and P. C. Sundara Babu (a2)

Abstract

Economic injury level (EIL) by the sorghum earhead bug was estimated for nymphs, feeding adults and ovipositing adults of sorghum earhead bug, Calocoris angustatus Lethierry, using malathion or hexachlorocyclohexane (HCH) as insecticidal control measure. EIL varied according to the insecticide used and the stage of the insect. EIL per panicle was 7.9 nymphs, 5.4 feeding adults or 0.06 ovipositing adults when HCH was used, which increased to 15.1 nymphs, 10.5 feeding adults and 0.12 ovipositing adults when malathion was used for control.

Le niveau du dommage economique fut estimé pour les nymphes et les adultes de la punaise du sorgho Calocoris angustatus Lethierry, en utilisant l'hexachlorocyclohexane (HCH) ou le malathion pour la lutte insecticidale. Le niveau du dommage economique variait selon l'insecticide utilisé et le stage du developpement de l'insect. Lorsque le HCH a été utilise le niveau du dommage economique par êpi fut de 7.9 nymphes, 5.4 adultes qui s'alimentaient ou 0.06 adultes en état de ponte contre respectivement 15.1, 10.5 et 0.12 quand on utilise le malathion pour la lutte.

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References

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Anonymous (1985) Crop Production Guide Tamil Nadu Agricultural University, Coimbatore, India, pp. 2438.
Hall, D. G. and Teetes, G. L. (1982) Yield loss density relationship of four species of panicle feeding bugs in sorghum. Environ. Ent. 11, 738741.
Natarajan, N. (1985) Bioecology and insecticidal control of sorghum earhead bug, Calocoris angustatus Lethierry. Ph.D. Thesis, Tamil Nadu Agric. University, Coimbatore, India.
Stern, V. N. (1973) Economic thresholds. Ann. Rev. Ent. 18, 260261.
Stewart, R. K. and Khattat, A. R. (1980a) Pest status and economie thresholds of tarnished plant bug, Lygus lineolaris (Hemiptera: Heteroptera: Miridae) on green beans in Quebec. Can. Ent. 112, 301305.
Stewart, R. K. and Khattat, A. R. (1980b) Economic injury levels of the tarnished plant bug, Lygus lineolaris on green beans in Quebec. Can. Ent. 112, 306310.

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