PLATE X. 
BEESON TOON SHOOT AND FRUIT BORER. 
THE SEASONAL HISTORY OF THE TOON SHOOT AND FRUIT BORER. 
The annual succession of broods of Hypsipyla robusta, Moore, is shown in 
diagrammatic form. The points on the circumference of the outer circle indicate 
the earliest dates at which the broods may normally occur, and the connected points 
on the circumference of the inner circle indicate the latest dates on which the same 
broods may occur. The solid black lines represent the moth oeriod, the hatched 
zone, the pupal period and the blank zone, the larval period! A reading taken 
along any one radius will reveal what stages of the borer are likely to occur or any 
one date. 
[ To face page 64. 
