;o—Lancaster Farming, Saturday. November 11,1967 2i Face Fly Control Making Progress Scientists are coming closer to control of insects and pests by means other than the use of sprays, researchers from Penn State University said to day during the annual meeting of the Eastern Branch of the Entomological Society of Am erica. This so-called “biological control” may someday elimin ate the face fly, a common pest among cattle, announced Sik-Chung Tung and Tien-Hsi Cheng of Penn State. The Penn State scientists said they found a period in the pupal or intermediate stage of the face fly when sex identifi cation is possible with the nak ed eye. To do this, the pupae must be made somewhat trans parent and should be well cleansed of film and bits of organic matter. The findings of Tung and Cheng are a new approach to control of face flies and related insects. Clean pupae can be separat ed into age groups by sex. Then the males can be more easily irradiated, making them sterile. When released the males mate with females but produce no offspring since the eggs are not fertilized. The problem is to select male fly pupae at a proper stage of development for ir radiation and release as adults. Mr. Tung, a Ph.D. candidate in entomology, and Dr. Cheng, head of zoology at Penn State, centered their comments around the methods they have developed for cleansing the larvae. The Penn 'Staters found that a common household detergent at low concentration has prov ed to be an effective cleansing agent that neither shortens the lives of the insects nor reduces their usual activity. Fly populations often are reared in biological laborator ies. The classic method of sep arating males from females is to immobilize the insects with low temperature or carbon di oxide, or by other means, and to remove desired specimens with the aid of a microscope This involves time-consuming handling in which- both sexes of the flies often are injured. It is (believed the Penn State method will help solve such problems. Other species of flies have Mild Nerve Deafness "Model of New" Miniature Hearing Aid Given (not an actual hearing aid) Washington, DC A most special offer, of unique interest to those who hear but do not understand words, has just been announced. A true life, non operating model, actual size replica of the smallest Dahl berg Hearing Aid ever made, will be given away absolutely free to anyone answering this advertisement. To determine just how comfortable it is, wear it in the privacy of your own home without cost or obli gation of any kind. “It’s Yours Free To Keep ” The size of this instrument is only one of its many features It weighs less than a third of an ounce and it is all at “ear level,” in one unit No wires lead from the body to the head Here is truly hope for the Hard of Hearing. These models are free We suggest that you write for yours now. R X Hearing Aid Service P.O. Box 567 Pottsville, Pa., or P.O Box 525, Lancaster. Research Is At Penn State been reduced in number, even exterminated, by the sterile male method of control in which irradiated males are re leased. Since females of some species mate only once in their lives, matings with irradiated sterile males produce no off spring and become an import ant phase of biological control. Did you know The Hem lock was adopted as the official State Tiee in 1930, and the Mountain Laurel was designat ed to be the official State Flower in 1933. HORNCO FEEDS The Crowing Choice of Business Fanners The Essential Ingredients To Produce A Pound Of From The Company With STEER FEEDING Know How D. E. Horn & Co., Inc. —Adv. More Steer Men Are Feeding Borneo Than Ever Before Homco Beef Supplements Are Fortified With All Beef At The Least Possible Cost. FEEDS • Farm-City SOIL SAMPLES. - alike. . I>ll is an ideal time to take Mr. Patton, who is a former f 011 “ft!! 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