INJURIOUS AND BENEFICIAL INSECTS 



31 



Treatment: handpicking or dusting with ashes. Burn all rub- 

 bish in the fall. 



G3 Four lined leaf bug (Poecilocapsus lineatus). 

 Bugs about y^^ inch long, yellowish, with four black stripes^ 

 frequent various plants and injure some considerably. A serious 

 enemy of the currant. There is but one brood annually. The 

 winter is passed in the egg, which hatches about the last of May, 

 the insect being full-grown about the middle of June. The white 

 eggs are deposited in slits made in the wood. 



Treatment : dust affected plants with ashes. Spray young with 

 kerosene emulsion. Cut and burn tips of bushes containing eggs. 



GRASS INSECTS 



64 Army worm (Leucania unipuncta). Brownish, 

 white striped caterpillars about 2 inches long devouring grasses 

 and allied plants occasionally ap- 

 pear in immense numbers. There 

 are two or three generations an- 

 nually in this state, but it is very 

 exceptional that this pest is as 

 destructive as it was in 1896. 

 The parent moth is brownish, 

 with a small white spot on the 

 fore wing. The eggs are laid by 

 preference in tough stalks of 

 rank herbage, such as grows 

 along neglected ditches, etc. 



Treatment: exclude the pests by ditching, or kill with poisoned 



baits. Prevent their occurrence 

 by clean culture. 



65 Hessian fly ( C e c i d o - 

 myia destructor). Dark- 

 er, broad leaves with free stool- 

 ing, followed by the infested 

 patches turning yellow, are the 

 usual indications of attack. 

 Fig. 55 Hessian fly There are two broods annually, 



Fig. 54 Army worm : moth, pupa and eggs In 

 natural position in a grass leaf — all natural size 

 (after Comstock) 



