« 



7 



Cockroaches — Cockroaches may be exterminated in houses by 

 spreading out at night cockroach poison — usually a mixture of 

 phosphorous and molasses. 



Aphis — Spraying with petroleum mixtures or tobacco decoc- 

 tion will often reduce aphids when they are exceptionally abund- 

 ant. The predaceous Coccinellid beetles usually keep them well 

 in check. 



Grasshoppers — Spray plants being damaged by grasshoppers 

 with arsenical poisons. 



Mealy bug, Flat scales, White fly, Leaf hopper— Spray in- 

 fested plants with petroleum mixtures or tobacco decoctions, or 

 fumigate with hydrocyanic acid gas. The white flies are also 

 attacked by parasitic fungi. 



Wood borers — Wood-boring beetles and the carpenter bee are 

 prevented from destroying timbers by soaking the timbers in car- 

 bolineum, which acts as a repellant. 



Cigarette beetle — Cigarette beetles in tobacco products are 

 controlled by fumigation with hydrocyanic acid gas. 



Japanese beetle — To reduce the injuries of Japanese beetle, 

 when severe, a combination of the following remedies is recom- 

 mended: hand-picking at night, poisoning with an arsenical 

 spray, the use of the Japanese beetle fungus, and plowing or 

 spading the turf in the vicinity of the injury to disturb the 

 larvse. 



Potato flea beetle — Spray with arsenical poisons. 



Bean weevils — To reduce bean weevils in stored beans, fumi- 

 gate with carbon bisulphid. Weevils in stored products should 

 be similarly treated. 



Mosquitoes and house flies — Relief from the adult fly can be 

 secured by screening, burning buhach powder, or trapping the 

 flies. The larvae of the mosquito can be killed by draining the 

 water in which it breeds or covering the surface of the water with 

 a film of petroleum. Duckweed and Azolla have also been used 

 to choke the surface of the water. The nuisance of the house fly 

 may be abated, where its breeding-place can be controlled, by 

 spreading out stable manure in which they breed on the ground. 



