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Life tables of sugar-cane top borer, Scirpophaga excerptalis Wlk.

Published online by Cambridge University Press:  19 September 2011

N. Mukunthan
N. Mukunthan
Affiliation:
Sugarcane Breeding Institute, Coimbatore-641007 Tamilnadu, India
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Abstract

Key mortality factors of sugar-cane top borer, Scirpophaga excerptalis Wlk. during the third brood were quantified on a susceptible sugar-cane variety, Co 1148 during 1981 and on susceptible CoJ 64, resistant CoJ 67 and collateral hoste, Sorghum halepense Peru, and Saccharum spontaneum L., during 1982 in Haryana (sub-tropical India). As artificial rearing of this borer is not possible, a methodology to have uniform age group at the beginning of the study by tagging the egg masses and the freshly attacked plants was developed. Results showed that parasitization of various stages and failure of neonate larvae to enter the midribs were the key mortality factors common to all the hosts. In S. halepense there was negative trend index (0.104) due to high mortality of larvae in all the instars. This revealed that it is not a suitable host for top borer. No predators were found to feed on any of the sub-imaginal stages of the borer due to the unique habits of the borer.

Résumé

Les clef mortalite facteur de tete boreur de canne a sucre durant de III re broche wast apprete en variete Co 1148 dans 1981 at pour susceptible CoJ 64, resistant CoJ 67 et collateral hote Sorghum halepense et Saccharum spontaneum en 1983 dans l'etat d'Hariana (Inde). Comme artificiet elever a cet egard le boreur ill ne'n le possible, a methode a la uniforme suele a' la commencement a etude etie employe par etiquette d'oeufs anas et nouvelle agress plant. Les resultats de parasitisme du varie stade larvaire et failure de entre de neo larvae dans nervus mediane worst d'clef mortalie facteurs common a alle hote. La negative direction indice dans S. halepense a cause de elive mortalite d'larvae en alle stade re veler et worst ne gut hote. Ne predators worst fund se noueru du subimaginal stade de le boreur a cause de une unique mancere de la boreur

Keywords

Sugar-cane top borerlife tables
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 3 , June 1989 , pp. 269 - 276
Copyright
Copyright © ICIPE 1989

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References

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