Further Studies of the Effects of Electromagnetic Waves on Insects1

Soil and soil-water heating is likely to prove a limiting factor in the use of electromagnetic waves against soil infesting insects. Irradiation of foliage wall of the apple tree with ordinary white light in the amount of ten foot candles reduced fruit infestation by first brood codling moth 50%. Eggs are, however, frequently deposited in this intensity. Irradiation in the neighborhood of thirty foot candles seems likely to be required to prevent free oviposition. The violet end of the spectrum excites the moth to apparently normal oviposition. The red end tends to produce abnormal activity with some egg laying.