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  • Author or Editor: J. B. Mowry x
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Abstract

‘Jonafree’ is an attractive red apple (Malm domestia Borkh) with field immunity to apple scab incited by Venturia inaequalis (Cke) Wint. The fruit is of medium size and matures with ‘Jonathan’. It is released as a potential commercial cultivar with strong resemblance to ‘Jonathan’ in many major horticultural characters in addition to its similar maturity date.

Open Access

Abstract

Apple scab, caused by the fungus Venturia inaequalis (Cke.) Wint. is one of the most economically important apple diseases, because of the annual loss of marketable fruit, tree debilitation as a result of foliage destruction, and the cost of chemicals, equipment, and labor for its control. Infection can occur at any time during the growing season in humid apple-producing areas of the world. Most scab control programs must be based on the application of 5 to 15 or more protective fungicide sprays from the beginning of bud break to harvest. Estimates of direct costs for scab control including fungicides, equipment costs, and labor range from 20 to 30¢ per bushel or some 10% of the annual cost of production. In addition, chemical control must be exacting with application of spray materials most efficacious in rainy spring weather it is oftne difficult to move equipment through the orchard.

Open Access

Abstract

‘Sir Prize’ is a yellow, russet-free apple with immunity to apple scab caused by Venturia inaequalis (Cke.) Wint. The fruit is large and ripens along with ‘Golden Delicious’. It is released as a home garden cultivar.

Open Access

Abstract

‘Priam’ is a new fall red apple with resistance to apple scab caused by Venturia inaequalis (Cke.) Wint. ripening close to ‘Jonathan’ and about one week before ‘Delicious’ (Fig. 1).

Open Access