Abstract
Indoleacetic acid applied to root pieces of grape cultivars resistant and susceptible to grape phylloxera, Daktulosphaira vitifoliae Fitch, induced production of swellings and rootlet branches. Effects increased with concentration of indoleacetic acid. Root sensitivity to indoleacetic acid was not greater in susceptible cultivars and does not appear to be a prime mechanism of the host plant resistance to grape phylloxera. Phylloxera did not preferentially establish on swellings induced by indoleacetic acid, but did on preformed grape phylloxera tuberosities. Thus, swellings caused by indoleacetic acid are not identical to grape phylloxera tuberosities.
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