124 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 2 



parasites and is closed with a cork stopper. Guy strings may con- 

 veniently be attached to prevent movement by the wind. 



With this cage a larger portion of the plant can be enclosed, more 

 squares can be supplied and more parasites placed under observation. 

 The very size, however, prevents as close observations as are possible 

 in the smaller cage. The oviposition of Sigalphus curculionis has al- 

 ready been observed in this cage. 



Field Cages 



To facilitate the increase of parasites in the cotton field, cages of 

 fourteen mesh wire are used, in which are placed the hanging or fallen 

 infested squares. Wire of this mesh enables all of the parasitefe to 

 escape, but only a very small percentage of the weevils. 



This cage is fifteen inches square and. three feet high. It is covered 

 on all sides, top and bottom with fourteen mesh wire. Five wire 

 shelves are built in this cage, five inches apart, and on these are placed 

 the infested, forms. These wire shelves allow a better circulation of 

 air, which keeps the material drier and also prevents heating and 

 molding. One entire side forms the door, giving access to all of the 

 shelves. When in the field this cage is kept free from infestation by 

 ants or mites by placing the legs in a zinc tray containing two or three 

 inches of water. 



Other types of cages have been made but as yet their usefulness has 

 not been proven by actual test. 



President Forbes : Any questions to ask or discussion of this 

 paper? 



A Member : Mr. President, we had an interesting experience in 

 trying to get parasites into tubes while studying a certain moth. We 

 put them in a box fitted with glass tubes and w^e secured neither moths 

 nor parasites. They had formed the habit of breeding in the dark and 

 they would not come out to the light. 



President Forbes : If there are no further remarks the next paper 

 will be read by Mr. Parrott. 



TREE CRICKETS AND INJURY TO APPLE WOOD 



By P. J. Pareott, Geneva, A\ Y. 



During the past two years our attention has been directed to dis- 

 colored areas on apple limbs, w^hich have the appearance of being the 

 early stages of a canker. These diseased spots have usually a dark 



