ms INJURIOUS INSECTS OF lyoj. 



This is not an insect, but belongs to a dififerent class called 

 Arachnida along with the spiders, scorpions and ticks, and to an 

 order known as Acaniia. Mr. Banks of Washington, a special- 

 ist in Arachnids, identified it as Carpoglyphiis passularum, Her- 

 ing, originally a European species, but which has been found, 

 so I was informed from Washington, in California. The sup- 

 position is, therefore, that the figs were originally infested and 

 that the mites spread from them to the apples. 



After looking over the situation I advised placing the infested 

 boxes in an air tight room and using i part bisulphide of carbon 

 for every 6,000 parts of atmosphere. It was further suggested 

 that when the boxes were returned to the warehouse a sfood 



Fig. 99. — Carpoglyphiis fassulariim, Hering. Enlarged about ij4 times. Original. 



grade of powdered sulphur be sprinkled over their tops and on 

 the floor of the room. It was stated clearly to the representative 

 of the finu that one treatment would not necessarily eradicate 

 the mites, and that the gas did not kill the eggs to the best of 

 my knowledge, and that several treatments might be necessary. 

 This fumigation was undertaken, not under the direction of the 

 Entomologist, but following his suggestions as nearly as pos- 

 sible. Upon the first trial 5 pounds of bisulphide were used 

 with an exposure of 26 hours, but the mites were alive when the 

 apartment was opened. A second trial was made, but was a 

 failure because of a leakage of gas. This was remedied and a 

 third trial was given, using 10 pounds of bisulphide and 48 

 hours' exposure to the fumes. When the room was opened the 



