Abstract
The Tulelake strain of California aster yellows was associated with a spindling-sprout condition of potato tubers in California. Grafting of virus infected potato scions to healthy potato plants in the field resulted in tubers with spindling sprouts, whereas non-grafted control plants produced only normally-sprouted tubers. Plants grafted as early as 30 days and as late as 86 days after planting produced spindling-sprouted tubers. No correlation existed between plant symptoms or early death of plants and spindling-sprout development in the tubers. Aster yellows infected tomato andNicotiana rustica scions were ineffective in producing abnormal tubers when grafted onto potato plants. Tubers predisposed to spindling sprouts germinated earlier than normal tubers.
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