caa a22 4500 386375755 CHVBK 20180307112017.0 cr unu---uuuuu 161130e198906 xx s 000 0 eng 10.1017/S1742758400003490 doi S1742758400003490 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400003490 Mukunthan N. Sugarcane Breeding Institute, Coimbatore-641007 Tamilnadu, India Life tables of sugar-cane top borer, Scirpophaga excerptalis Wlk [Elektronische Daten] [N. Mukunthan] 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. Copyright © ICIPE 1989 Sugar-cane top borer nationallicence life tables nationallicence International Journal of Tropical Insect Science Cambridge University Press 10/3(1989-06), 269-276 1742-7584 10:3<269 1989 10 JTI https://doi.org/10.1017/S1742758400003490 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400003490 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Mukunthan N. Sugarcane Breeding Institute, Coimbatore-641007 Tamilnadu, India NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 10/3(1989-06), 269-276 1742-7584 10:3<269 1989 10 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge