C. 11 Williams 



239 



as on a very early attack (May) before the flowers are out, or later in the 

 year on late sown varieties. It was this type of injury that Try bom 

 (1899) describes as being most prevalent in Sweden, when the injuries 

 caused whole terminal clusters to wither. Later w'hen the flowers are 



Fig. 12. Pods and flowers of peas damaged by thiips. 



attacked these shrivel up and turn brown and in bad cases no pod at 

 all may be formed. Usually, however, it is when the pods are small 

 that the damage is most noticeable ; they are sickly, undersized and 

 curled and covered with very characteristic silvery brown areas where 

 the larvae have been feeding. These areas are generally near the base 



