. Bulletin of the Department of Agriculture. Agriculture. CONTROL OF ARGENTINE ANT IN CALIFORNIA. 15 of ants but their effectiveness was lost upon exposure to the weather. Once wet these insecticides are valueless. These powders, especially the pyrethrum, singly or in combination with the sodium fluorid, are decidedly repellent to ants and quickly cause death once they come well in contact with their bodies. The fact that their strength is soon lost on exposure to air restricts their usefulness. The following experiments demonstrate the comparative efficiency of these substances used sing
. Bulletin of the Department of Agriculture. Agriculture. CONTROL OF ARGENTINE ANT IN CALIFORNIA. 15 of ants but their effectiveness was lost upon exposure to the weather. Once wet these insecticides are valueless. These powders, especially the pyrethrum, singly or in combination with the sodium fluorid, are decidedly repellent to ants and quickly cause death once they come well in contact with their bodies. The fact that their strength is soon lost on exposure to air restricts their usefulness. The following experiments demonstrate the comparative efficiency of these substances used singly or in combination. Breeding cages containing a large amount of mealybug-infested lemons and potato sprouts were heavily attended by ants which entered in steady streams along the legs. The legs were set in tops of fruit jars contain- ing a small amount of sodium fluorid powder. Ants continued to cross in limited num- bers for about one hour before the trails were completely bro- ken up. No dead ants were found. Pyrethrum powder was sprinkled about the legs of one cage, stopping the trails almost immediately. Dead ants began to pile up in the powder and on the floor about the powder. A mixture contain- '^"^" 6.—Repellent ant powders: a, Pyrethrum: b, pjTethrum 30 per , cent, sodium fluorid 70 per cent. Shaker and blower for applying. mg pyrethrum 1 part, sodium fluorid 7 parts, and plaster of Paris 2 parts, was dusted about the legs of a breeding cage attended by ants with effects about as satisfactory as with pyrethrum alone. Corrosive Sublimate Ant Bands Corrosive sublimate has long been known to possess merit as a repellent to ants and this fact has been utilized in protecting materials from these pests. A common method is to soak narrow strips of cloth in a saturated solution of this chemical and use these as barriers. The saturated solution is best prepared by heatmg about H ounces of corrosive sublimate in an ounce of water until the maximum amount is dissol
Size: 1807px × 1383px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
