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2021, Vol: 8, Issue: 8
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    SPATIAL DISTRIBUTION PATTERN OF SUCKING PESTS ON PROMISING SUNFLOWER LINES (Helianthus annuus L.) (2018)
    Amala Hyacinth A.M, Chand Asaf
    JCR. 2018: 120-139

    Abstract

    One hundred and twelve accessions of sunflower (Helianthus annuus L.) were screened under field conditions in two seasons at Sambavar Vadakarai and Udappankulam villages of Tirunelveli district of Tamilnadu, India during January to April and June to September, 2016. Investigations were made to study the distribution pattern of pests viz., whiteflies (Bemisia tabaci), leaf hoppers (Amrasca biguttula biguttula) and thrips (Thrips palmi) on sunflower. Studies on spatial distribution of the above pests revealed a negative binomial distribution and aggregated nature on sunflower. Intra-plant distribution studies indicated that middle strata of sunflower recorded least relative variation for whiteflies and hence provided Host reliable estimate of their population. With regard to leaf hoppers, based on least relative variation, lower strata was best suited for estimating population on sunflower. The upper strata recorded least relative variation for thrips and thus provided a reliable population estimate.

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