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  • Author or Editor: Sam Asen x
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Abstract

A high pressure liquid chromatographic procedure for the separation and quantitation of naturally occurring flavonoids is described. Attributes of the technique include rapid analysis, high sensitivity and resolution, no derivatization or risk of thermal decomposition, and easy quantitation. The method is superior to existing classical chromatographic procedures. The use of flavonoid absorption profiles, obtained by this technique, is an important adjunct to the descriptive morphological and physiological methods presently used to identify plant cultivars.

Open Access

Abstract

Ethylene hastens the ripening of fruits and is sometimes considered to be a ripening hormone (1). It also can regulate the flowering of bromeliads (2) as well as hasten deterioration of certain cut flowers (3). We are reporting accelerated flowering of bulbous iris after treating the bulbs with ethylene.

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