Abstract
Many methods have been developed for detecting hidden insect infestation in grain. Of these, only the X-ray-radiographic and the cracking-flotation techniques have found any degree of acceptance. Technical difficulties have limited wider acceptance of these methods. Because the grain industry is badly in need of a sound and efficient method, research was conducted to develop such a method. The techniques (or principles) investigated were light transmittance, f1uorescence, electrical, rheological, and chemical responses and reactions. The most promising was a chemical indicator technique in which the body fluids of the insects produced a color reaction with ninhydrin-impregnated filter paper. The ninhydrin process met the required design objectives of high sensitivity and specificity, suitability to mechanization, and competitive initial and operating cost. The above was first demonstrated on a prototype. An improved unit has been built, which will be field tested in comparison with the X-ray method.
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