Genotypic effects of sorghum accessions on fecundity of sorghum head bug, Calocoris angustatus Lethiery

    Sharma, H C and Lopez, V F and Nwanze, K F (1993) Genotypic effects of sorghum accessions on fecundity of sorghum head bug, Calocoris angustatus Lethiery. Euphytica, 65 (3). pp. 167-175. ISSN 0014-2336

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    Abstract

    Sorghum head bug (Calocoris angustatus Leth.) (Hemiptera: Miridae) is an important pest of grain sorghum in India. We studied the fecundity of head bug females reared for one to three generations on head bug-resistant and head bug-susceptible genotypes during the 1988 and 1989 rainy and 1988–89 post-rainy seasons. Head bug population increase was lower for the first, second and/or third generation when the bugs were reared on IS 2761, IS 19955, IS 14334, IS 23748, IS 16357, IS 17610, and IS 21444 compared with the susceptible controls CSH 1, CSH 5, and CSH 9. These genotypes also suffered a low grain damage (damage rating (DR) le5) (except IS 2761) compared with the susceptible controls (DR>6). A marginal decrease in fecundity was observed when the bugs were reared on IS 2761, IS 14334, IS 16357, IS 20740 and IS 17610 and then transferred to the susceptible control, CSH 1. Sorghum genotypes having lower increase in bug population across generations, suffering low grain damage, and showing adverse effects on fecundity can be used in breeding for resistance to head bugs.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Uncontrolled Keywords: Calocoris angustatus, host-plant, resistance, fecundity, grain damage, sorghum, sorghum head bug, Sorghum bicolor
    Subjects: Mandate crops > Sorghum
    Depositing User: Mr Sanat Kumar Behera
    Date Deposited: 08 Oct 2011 12:40
    Last Modified: 08 Oct 2011 12:40
    URI: http://oar.icrisat.org/id/eprint/2098
    Official URL: http://dx.doi.org/10.1007/BF00023080
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: We thank Mr. V. V. Rao and Mr. S. Raja Rao for their assistace in these studies, Mr. P. Vidyasagar for his help in stastical analysis , Dr. J. M. J de Wet for his comments, and Mr. I. Krishna Murthy for typing the manuscript
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