BULLETIN 192. 



INSECTS INJURIOUS TO THE VINE. 



121 



had all disappeared when we visited the vineyard on August the first, 

 and according to the owners they simply dried up. It was probably 

 due to a fungous 

 disease which often 

 destroys these cat- 

 erpillars in great 

 numbers. We also 

 found these cater- 

 pillars in the vine- 

 yards about Lodi in 

 June and August, 

 indicating that 

 there are two 

 broods in a season. 



Control Measures. 



Where there are 



but occasional 



specimens of this 



insect found in the 



vineyard, the 



cheapest and most 



practical way is to 



pick them off by 



hand. Where there 



are immense num- 

 bers of them, as in the case mentioned at Reedley, hand picking 



becomes a laborious task. In the latter case a thorough spraying with 



a strong arsenical 

 spray applied just 

 at the time they 

 are hatching, will 

 check them before' 

 they can do a great 

 deal of harm. 



If the adult 

 moths are particu- 

 larly attracted by 

 the petunias, as 

 seems to be the 

 case, ' a means of 

 capturing them in 

 this stage may be 



found in poisoning the flowers thoroughly with some soluble poison or 



by catching them in traps. The effectiveness of these methods will 



FIG. 10. Chrysalids of a Hawk Moth (Philampeles achemon Drury). 



FIG. 11. Hawk moth (Philampeles achemon Drury). 



