200 INSECTS AFFECTING THE CABBAGE. 



leaf, and generally from eleven to twelve in number. 

 In about six days in April (four days in July) there 

 hatches out from these eggs a brood of larvae, resem- 

 bling the perfect insect, except in having no wings. 

 This brood immediately begins the work of destruc- 

 tion by piercing and sucking the life-sap from the 

 leaves, and in twelve days they have matured. They 

 are timid, and run off and hide behind the first leaf 

 stem, or any part of the plant that will answer the 

 purpose. The leaf that they puncture soon wilts, 

 like the effects of poison, and soon withers. Half a 

 dozen grown insects will kill a cabbage in a day." 

 At the South there are several broods each season. 

 Remedies. — Hot water, kerosene emulsion, and 

 pyrethrum are the substances chiefly recommended 

 for the destruction of this pest. Clean cultivation 

 and the burning of all rubbish are important pre- 

 ventive measures, in spring and autumn many of 

 the bugs may be trapped. by laying cabbage or turnip 

 leaves between the rows : the inserts will harbor under 

 these, and may be collected each morning. It is 

 especially important to destroy the earlier broods of 

 this pest, because otherwise it increases so rapidly 

 as to be almost unconquerable. 



The Cabbage Aphis. 



Aphis brassica . 

 Next to the Imported Cabbage Worm this species 

 is, perhaps, the most injurious insect enemy of the 

 cabbage ; and it also infests various other cruciferous 



