662 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 17 
decay after being packed, especially in cold storage, and soon breaks 
down, becoming slimy and extremely disagreeable. This slime of the 
mouldy prunes spreads to adjoining prunes and then throughout the 
whole package, rendering the entire box unmarketable and unfit for use. 
This condition usually occurs in storage at the point to which the fruit 
has been shipped after the grower has been to the expense of paying 
freight or express charges. 
Some idea of the number of these tree crickets can be gained when it is 
pointed out that Mr. Claude Wakefand, Entomologist of the University 
of Idaho, has counted as high as 1386 individuals killed under a single 
tree. 
APPLICATION OF THE RONTGEN TUBE TO DETECTION 
OF BORING INSECTS 
By N. Yaghi, Special Entomologist in the Government Agricultural Exp?: iment 
Station, Nishigahara, Tokyo, Japan 
I The rontgen tube has ever been used in experiments on the effect of 
the rays on development of insects and sterilization of gonads. I used 
Fig. 20.—1, Apriona rugicollis Chev. in apple tree; 2, Melanauster chinensis Forst. 
in apple tree; 3, Chreonoma fortunei Thom, in pear stem; 4, Sciapteron regale 
Butl. in grape tree; 5, Chilo simplex Butl. in rice straw; 6, Bean grains bored by 
Pyralis farinalis L.; 7, Larvae and pupae of Calandra oryzae L. in rice grains; 
8, Tinea pellionella L. in wool matter. 
