IV PAPEES ON INSECTS AFFECTING VEGETABLES. 
Page 
A little-known cutworm (Porosagrotis vetusta Walk.) F. H. Chittenden.. 47 
Injurious occurrence 47 
Results from applications of arsenate of lead 49 
Description 50 
The moth 50 
The larva 50 
Distribution 50 
Natural enemies . 51 
Arsenite of zinc and lead chromate as remedies against the Colorado potato 
beetle < Fred A. Johnston. . 53 
Spraying experiments with arsenite of zinc and lead chromate in compari- 
son with other arsenicals 53 
Spraying experiments with arsenite of zinc of different strengths 55 
A report of progress regarding the sugar-beet web worm (Loxostege sticticalis L.), 
H.O. Marsh.. 57 
Introduction 57 
General appearance of the sugar-beet web worm and nature of attack 58 
Life history and habits 59 
Character of injury 61 
Natural enemies 62 
Other checks 63 
Experiments with remedies 63 
Spraying machinery 66 
Cost of spraying 69 
Conclusion 70 
The horse-radish web worm (Plutella armoracia Busck) H. 0. Marsh. . 71 
Introduction 71 
Occurrence in Colorado 71 
General appearance and habits 72 
Life history 73 
Rearing records 73 
Egg-laying record 75 
Natural enemies . . . 75 
Experiments with insecticides 76 
Recommendations for control , 76 
Conclusion 76 
Index 77 
