280 



THE MONTHLY BITLLETIN. 



after mating' the females begin to insert their eggs into the tender tips 

 of the young shoots. The eggs hatch in a short time into larvie which 

 work up the shoots until the latter are killed, when they turn and go 

 down the middle pith of the stems and transform in the late fall and 

 winter into pupa?. There is but one brood each year. 



Fig. 28:i. — The raspberry horn-tail, Hartigia cressoni. a. 

 adult female ; b, adult male ; c, well developed pupa ; d, very young 

 pupa; e and f. larva^. ( Essig, M. B. Cal. Hort Com.). 



Distribution. — The central part of the State, more particularly in 

 the foothill regions east of the Sacramento River. 



Food Plants. — The native host of this insect is i)ro])al)ly the wild 

 rose. Raspberries suffer most from the attacks. Cultivated roses, 

 blackberries and loganberries are also food plants. 



Control, — Measures necessary to remove or destroy the eggs before 

 the young larva^ hatch should be inaugurated. As the eggs are very ten- 

 der and their locations plain, great numbers may be quickly destroyed 

 by exerting a slight pressure over them with the fingers, which in no 

 way injures the shoot. C'utting out infested canes is also recommended. 



