Resistance to Mirid Bug Creontiades Biseratense (Distant) in Cotton
Keywords:Cotton, resistance, incidence, screening, Creontiades biseratense, trichome density, midvein, boll rind, thickness of leaf, squares, length of petiole, correlation coefficient
A field experiment was carried out in the AICRP on Cotton, Haradanahalli Farm, Chamarajanagar, Karnataka to know the association of morphological characters of 15 cotton genotypes (different resistance category) influencing resistance to mirid bug, Creontiades biseratense. Cotton morphological parameters viz., trichome density on leaves, squares and midvein showed a significance difference with the genotypes and the higher incidence of mirid bug was recorded on genotypes having more trichome density. Similarly, genotypes having higher boll rind thickness and length of petiole recorded the higher incidence. of C. biseratense. There was a significant positive correlation between C. biseratense incidence and trichomes on leaves (r = 0.90**), trichomes on squares (r = 0.89**), trichomes on midvein (r = 0.91**), boll rind thickness (0.80**) and length of petiole (r = 0.60*). However thickness of leaf showed the non-significant negative difference among the genotypes (r = -0.03).
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