Dusting VS. Spraying for the Control of Insect Pests on the Avocado1
Journal of Economic Entomology
December, '21] MOZNETTE: AVOCADO INSECTS 465 sodium hydroxid, the writers' conclude that the sodium ion is not a repellent to house-fly oviposition and its presence in some salt combinations may be moderately, attractive. Of the remaining substances'lin the list receiving more than 60 percent of eggs, all are fatty acids and therefore chemically kin to carbonic acid. Of these acetic acid leads by a wide margin and it is worthy of note that this is the acid most likely to occur in the ordinary
... r in the ordinary decomposition processes of vegetable matter where carbon dioxid is also liberated. Gravid house flies appear to be indifferent to the presence of the organic bases, grain alcohol and glycerin, as might also be stated of the mixed compound lactic acid. The mineral acids, hydrochloric and sulphuric, appear to be moderate repellents. In the light of present results the writers' sug-gest that the female house fly is attracted for egg laying by decaying organic matter in proportion to the amount of carbonic and acetic acids liberated in the fermentation processes, and that the preference for decaying vegetable rather than animal matter may have its explanation in this fact. Also it is possible that its predisposition for these two acids may explain the fondness of the house fly for human environments generally, particularly dwelling houses and livery stables.