184 



take the places of any that may be destroyed in cultivated nut 

 orchards and groves. The case is not hopeless, however, and 

 some very satisfactory results are being obtained by a few per- 

 sons who are producing and handling nuts on a large scale. 



FUMIGATION WITH BISULPHIDE OF CARBON. This ma- 

 terial may be obtained at most drug stores at a cost of about 

 25 cents a pint in small quantities. Fumigation with it is re- 

 commended for nuts when they are first harvested. The treat- 

 ment kills many of the larvae within the nuts before they have 

 attained much size, and renders the nuts more salable, although 

 it may be a question as to whether or not the consumer should 

 be pleased with this manner of hiding the defective kernels. 



In using this treatment, a light box or barrel is provided 

 of a size sufficient to accommodate the quantity of nuts to be 

 fumigated. The nuts are placed in the receptacle and a shallow 

 dish set on top of them. Into this dish the bisulphide is poured, 

 from half an ounce to an ounce being used for each bushel of 

 nuts. The receptacle 'containing the nuts should be furnished 

 with a tight fitting lid and this should be put in place at once 

 after the liquid is poured into the dish. The nuts should then 

 be left undisturbed for from twelve to twenty-four hours. 



The bisulphide of carbon volitlizes very rapidly and the gas 

 which is thrown off, being heavier than the atmosphere, settles 

 to the bottom of the vessel, penetrating the shells of the nuts 

 and killing the insects within. The tighter the receptacle con- 

 taining the nuts the less bisulphide will be required and the 

 more effective will be the treatment. It may be necessary to 

 repeat the fumigation in about ten days to kill the young larvae 

 that hatch from eggs that were in the nuts at the time of the 

 first treatment. 



The bisulphide of carbon has a very disagreeable odor but 

 this passes off quickly after the nuts are exposed to the air. In 

 using this material care should always be taken to keep fire 

 away as the gas is very inflammable. 



DESTROYING INFESTED NUTS. The larvae of most of 



