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[Some mental factors in sexual sterility and their significance for getting pregnant. I. Development of the partners up to the marriage].

Supplementing earlier reports, the results on testing of the development of the personalities of 75 partners with involuntary infertility are reported. Some partners show correlations to the cause of infertility which support our opinion of the psychosomatic characteristics of infertility. It can be assumed that early influences from the development of the personality prepare for later infertility. The degree of these factors has a bearing on the treatment of the infertility. The pregnancy rate of the different factors investigated is described.

Female↗

Control of insects by sexual sterilization.

The control of insect populations by restricting their birth rate offers several advantages over methods based on increasing the death rate. The sterile-male technique scored practical success in the control of the screwworm, Cochliomyia hominivorax (Coquerel), but more general applications of the sterility procedure may be expected in conjunction with the development of integrated procedures for pest insect management.

Animals↗

Population flushing with sexually sterile insects.

In theory, populations of animals can be displaced by overloading a resource with introduced sterile animals. The theory was tested on natural populations of the Queensland fruitfly Dacus tryoni Frogg. Three of four treated populations declined sharply within 2 days after sterile flies had been introduced. This procedure may be useful both as a tool in experimental ecology and as a means of controlling pests.

Animals↗