Show mans never ending war on his insect enemies one war that never ceases Is that waged by insects upon man every vear insects cost tl e human race mil rill lions upon millions of dollars by their destra destruction ebion of growing crops and stored harvests and they kill or malm maim thousands of human beings by spreading disease science Is constantly engaged in investigating new means of keeping insect foes toes at bay and wonderful work has been done the stamping out of malaria in large areas once almost un inhabit able and the checking of the spread of sleeping sickness are examples of what has been accomplished now comes news of a discovery which may open up entirely new lines of attack on insect pests for a long time past a young australian scientist dr IF G holdaway has been endeavoring to find a way of dealing with the flour beetle which does an enormous amount of damage ile has found that the proportion of grubs that turn into miles and females can be controlled by rem regulating latIng their food starve a hundred d grubs for one day and the majority will develop into male beetles now the female beetle may lay thousands of eggs if therefore he h has as found a means of decreasing dec the number of females the beetle pest may be kept down similar prin caples of sex control may be found applicable to other insect enemies of man |