INJURIOUS INSECTS 137 



they are measurably protected from this insect. But the 

 latter applications are greatly improved by adding a little 

 poison to them. 



Leaf Lice or Aphides (Aphis sp.). The various kinds 

 of leaf lice, otherwise called aphides, that live on plants have 

 very much the same general habits. They are all sucking 

 insects and increase with great rapidity when their food 

 plants are abundant. They generally winter over in the egg 

 state. The summer broods are often brought forth with- 

 out the intervention of the egg state. Kerosene emulsion 

 and tobacco water are the useful remedies, but hot water 

 and pyre thrum will also destroy them. Leaf lice are eaten 

 by the larvae of lady bugs, and they are also subject to at- 

 tacks of parasites. When the lice are coated with a meal- 

 like covering that sheds water and prevents their being wet 

 by insecticides, they should first be sprayed with strong 

 soapsuds to remove the mealy covering and then the 

 insecticide may be applied successfully. 



Cabbage Lice or Aphides (Aphis brassicae). These are 

 light brown insects covered with a floury substance. They 

 attack turnips, cauliflower, rutabagas, and similar plants, 

 as well as the cabbage. They work generally on the lower 

 side of the leaves, where they collect most abundantly. 

 They are most numerous in dry seasons. The remedies 

 for them are those given under the general head of leaf lice, 

 but in addition to those it is a good plan to burn or compost 

 all the old cabbage leaves and stumps, since the eggs winter 

 over attached to them. 



Sweet Corn Moth or Tassel Worm (Ileliophila uni- 

 pucta). This is the boll worm of the South. It eats into 

 the green gram of the corn, but is seldom very trouble- 

 some in the North. Dr. Lugger thinks that it does not 

 winter over in the extreme Northern states, but that the 



