282 PROTECTION AGAINST INSECTS. 



It is sometimes associated with Scsia apiformis, Fabr., and 

 Cossus liyniperda, Fabr. 



The beetles in June and July eat roundish holes in poplar 

 leaves, but this injury is unimportant. 



d. Protective Rides. 



i. Poplar-nurseries should not be established near older 

 poplars. 



ii. Poplar-saplings liable to attack may be smeared in June 

 up to 5 feet in height from the ground, with a mixture of clay 

 and cow-dung, or Leinweber's composition (page 278). This 

 treatment is to be recommended for nurseries. 



e. Remedial Measures. 



i. Collection of the beetles by shaking the saplings in June 

 and July. 



ii. Felling and removal of all attacked saplings before the 

 beetles emerge. 



2. Saperda populnea, L. (Small Poplar Longicom). 



a. Description* 



Beetle 8 13 mm. long, greenish-grey to dark brown, 

 covered with yellow-grey pubescence ; thorax with 3 lines of 

 pubescence ; elytra with the median line, and a broad lateral 

 stripe, and three or four spots on each side pubescent. 

 Antennae blackish, and each segment up to two-thirds of 

 the length of the antennae with grey pubescence. Larva 

 13 15 mm. long, yellowish and resembling that of the 

 preceding species. 



b. Life-history. 



The female deposits her eggs in May and June in cracks on 

 the bark of young aspens, less commonly on other species of 

 poplar, sometimes on willows. Seedlings of 2 to 6 years old 

 and suckers are preferred. 



Generation biennial. The larva hatches in July, bores 

 through the bark and eats a circular gallery round the 

 sapwood. The stem, usually one of the smaller branches, 



