In some cases this can actually make the plants immune to attack, as is the case with the lettuces Avoncrisp and Avondefiance which were bred at the Institute of Horticultural Research, Wellesbourne during the 1960s, which are fully resistant to lettuce root aphid (Pemphigus bursarius).
In 1993 Tanksley was the head of a Cornell research group that isolated and subsequently cloned a disease resistant gene in tomato plants.
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