Ring rot increase in potato seed lots having known quantities of infection
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One-bushel samples of potatoes, each containing a “trace” of ringrot, were sent from Maine, Minnesota, Nebraska, New York and North Dakota to the Wyoming Agricultural Experiment Station, where they were grown in 1942 to determine the amount of ring-rot increase in the crop.
Each state sample was divided according to tuber size and planted separately either as whole tubers or as cut seed pieces. Ring-rot infection in each lot was determined both by plant symptoms and by the gram-stain method. The per cent of ring-rot by the latter method varied from 0.63 to 2.31 per cent in the five lots from the different states. Thus, the samples with a “trace” of disease produced an average of 1.31 per cent of ring-rot in the subsequent crop.
In addition, larger amounts of ring-rot were introduced in healthy seed, one-half of which was treated and the other one-half left untreated. The percentages of ring-rot introduced in the different lots were as follows: 0.10, 0:25, 0.50 and 1.00.
The resulting ring-rot in the treated lots ranged from 0.60 to 2.58 whereas in similar untreated lots it ranged from 1.48 to 18.69 per cent.
KeywordsAMERICAN Potato Journal Seed Piece Plant Symptom Potato Association Subsequent Crop
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