Frost Injury Simulating Virus Disease Symptoms on Potato Foliage

Abstract

THE production of virus-free seed potatoes has been a matter of increasing interest in the British Isles during recent years. The methods of building up healthy stocks originally adopted in Ireland and now being favoured elsewhere consist, briefly, in the scientific testing of selected plants in the glass-house and the subsequent propagation of proved healthy units in isolation in the field. Foundation stocks produced in this manner are distributed to the growers, whose crops are subject to a rigid system of inspection before being certified for seed purposes.