Influence of panicle compactness and host plant resistance in sequential plantings on population increase of panicle-feeding insects in Sorghum bicolor (L.) Moench.

    Sharma, H C and Lopez, V F and Vidyasagar, P (1994) Influence of panicle compactness and host plant resistance in sequential plantings on population increase of panicle-feeding insects in Sorghum bicolor (L.) Moench. International Journal of Pest Management, 40 (2). pp. 216-221. ISSN 0967-0874

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    Abstract

    The effects of panicle compactness and host plant resistance on the rate of population increase of sorghum midge (Contarinia sorghicola Coq.), head bugs (Calocoris angustatus Leth.) and head caterpillar (Helicoverpa armigera Hb.) in large concentric plots over three sequential sowings during the 1985–86 rainy seasons were studied. Early‐planted crops suffered less damage than the late‐planted crops. H. armigera damage was negligible in genotypes with loose panicles. Calocoris angustatus population increase was lower in genotypes with loose panicles. Panicle compactness did not affect the damage caused by C. sorghicola and Campylomma spp. Host plant resistance had a marked effect on the rate of population increase across sowing dates in the case of sorghum midge and head bugs. Thus, cultivars with resistance to insects and/or with loose panicles can help to reduce the losses caused by panicle‐feeding insects in sorghum.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Sorghum
    Depositing User: Mr Charan Sai Ch
    Date Deposited: 06 Dec 2011 14:08
    Last Modified: 06 Dec 2011 14:08
    URI: http://oar.icrisat.org/id/eprint/3253
    Official URL: http://dx.doi.org/10.1080/09670879409371885
    Projects: UNSPECIFIED
    Funders: UNSPECIFIED
    Acknowledgement: We thank Mr V. V. Rao and Mr D. Krishna for their help in field studies, Mr G. Venkateswarlu for his help in data analysis and Dr K. F. Nwanze and Dr D. E. Byth for their constructive comments on the manuscript. Approved as JA No. 1583 by the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India.
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