Apparent resistance of Venturia inaequalis to dodine in New York apple orchards
1969
Szkolnik, M. | Gilpatrick, J.D.
Fruit growers in certain areas of New York State who have used dodine (n-dodecylguanidine acetate) sprays successfully for as long as 9 years for apple scab control have not obtained satisfactory control of this disease for the last 1 to 3 years. Other fungicides continue to perform satisfactorily. In aerial and ground spray research plots at Sodus, N. Y., decreased control with dodine was observed in 1968. In 1969, control with dodine here was completely unsatisfactory. In this same orchard maneb and captan gave excellent scab control both years. The reason for these dodine failures in controlling scab is attributed to resistance in Venturia inaequalis to dodine acquired over a period of years. This apparent resistance has been observed so far in the Lake Ontario fruit belt counties and in the Geneva area of New York State.
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