206 BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 



1658. RILEY, C. V. Continued. 



THE COLORADO POTATO-BEETLE Continued. 



Area invaded by it 24 



Causes which limit its spread 25 



Intense heat in the South, 25 Excessive dryness in the mountains, 

 26. 



How it affected the price of potatoes 26 



The modification it has undergone 27 



Its natural history 27 



First made known in 1863, 28 The female capable of laying 1,000 

 eggs, 29 Three broods a year, 28. 



Its poisonous qualities.. 29 



Exhalations from the crushed bodies injurious. 29. 



Its food-plants 30 



The number increases with each year, 32 Varieties of potatoes 

 preferred, 33. 



The beetle eats as well as the larva 33 



Its natural enemies 34 



Birds which feed upon it, 35-36 Domestic fowls, 36 Reptiles, 36 

 Spiders and ites, 36-38 True insects, 39 Rust-red social wasp, 

 40 Lady-birds, 40-43 Ground-beetles, 44-45 Rove-beetles, 46 

 Blister-beetles, 46 Soldier-bugs, 47-51 Tachina-fly, 52 Asilus- 

 flies, 53. 



Remedies 54 



Encouragement of natural enemies, 54 Preventive measures, 54 

 Mechanical means of destruction, 55 Pincers for, 56 Sun-scald- 

 ing, 56 Horse-machine, 57 Machines for collecting, 58, 59-Poi- 

 sonons applications to the plant, 60 Paris green, 61 Different 

 modes of using Paris green, 62-65 Other poisonous applications 

 tested, 66 Patent poisons, 68. 



The use of Paris green 69 



Its influence on the plant, 70 Its influence on the soil, 71 Its in- 

 fluence on man indirectly through the soil or through the plant, 74. 



Bogus experiments 75 



Alarm about the insect abroad 76 



Unnecessary prohibition of traffic in American potatoes, 77 How 

 the insect will most likely get to Europe, 78 The chances of its 

 getting there, 79-82 Could it become acclimated there ?, 82. 



Nomenclature 83 



The bogus Colorado potato-beelle, Doryphorajuncta 85 



It has always existed east of the Mississippi, 85 It never attacks 

 the cultivated potato, 85 Easily coufounded with its potato- 

 feeding congener, 86 How the two differ, 86-88. 



OTHER INSECT FOES OF THE POTATO. 



THE STALK-BORER, Gortijna nitela 90 



Habits, 90 Remedy, 91. 



THE POTATO STALK-WEEVIL, TricJioboris trinotata 92 



Habits, 92 Remedy, 93. 



THE POTATO OR TOMATO WORM, Protoparce celeus 93 



Habits, 94 Remedies, 95 Parasites, 96. 



BLISTER-BEETLES j . 96 



The striped blister-beetle, Epicauta vittata 97 



The ash-gray blister-beetle, Macrobasis unicolor 98 



The black-rat blister-beetle, Macrobasis unicolor... 99 



