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The effects of time of sowing and harvest on carrot biochemistry and the resistance of carrots to carrot fly
Author(s) -
COLE ROSEMARY A.,
PHELPS KATHLEEN,
ELLIS P. R.,
HARDMAN J. A.
Publication year - 1987
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1987.tb03240.x
Subject(s) - biology , daucus carota , sowing , cultivar , chlorogenic acid , root crops , horticulture , crop , larva , resistance (ecology) , agronomy , botany
SUMMARY Two carrot cultivars which represented contrasting levels of resistance to carrot fly, Psila rosae , were grown in a replicated field experiment at Wellesbourne in 1984–85. Seed was sown on five occasions between April and August 1984 and the crop harvested after a minimum growth in the field of 16 wk on seven occasions between August 1984 and February 1985. A highly significant correlation (r = ‐0.78; P > 0.001) between the levels of carrot fly damage and the concentration of chlorogenic acid in the roots enabled a model to be formulated to predict the relative predisposition to carrot fly larval damage; high levels of chlorogenic acid early in the season predisposed roots to severe attack when they were older.