INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



215 



THE PACIFIC PLANT-BUG 



Thyrilhis pacificus Uhler 



1 1 rhisitr pacificus i Uhler I | 



(Fig. 190) 



Description. — The mature bug is grayish-black throughout with 



somewhat clouded membrane at the tips of the wings. The head is the 



narrowest part of the body, which 



gradually widens nearly to the tip 



of the abdomen, where it is bluntly 



rounded, as shown in Fig. 190. The 



antennas are slender and as long as 



the body, which averages ,v, inch in 



length. 



Life History.- This is practically 

 the same as for the black plant- 

 bug. 



Nature of Wcrk. -Like many of 

 the plant-bugs, this species causes 

 a yellow spotting of the leaves, as 

 shown in Fig. 190. Infested plants 

 often dry up or become stunted. 



Distribution. — This species occurs 

 throughout the northern and central 

 parts of the State. 



Food Plants. — The grains and 

 grasses are ordinarily infested, in- 

 cluding bailey, oats and wheat. 



Control.— As the attacks of this 

 bug are usually spasmodic and of 

 short duration, control measures are 

 net likely to be warranted. How- 

 ever, should a serious invasion occur, 



the remedies as rpeom mended for the Fi§ - 190.— The Pacific plant-bug, Thy- 



uk rtmeuies as ictonum iiik u lor uu rUlns paci fi cus uiiler. Adults and their 



black plant-bug and the tarnished work on wheat. Natural size. Speci- 



, . i i -, mens taken at Redding by Leroy Clnlds. 



plant-bug may be used. (Original) 



