Eeport of the Entomologists. 02 J 



lators. They fly into the houses on cloudy days and late in the 

 afternoon or early evening. They are very destructive to chrys- 

 anthemums, cutting off the flower buds, also to smilax, but they 

 usually do the largest amount of damage in lettuce houses and 

 especially to lettuce in cold frames. 



The most practical remedy thus far found for use in forcing- 

 houses and cold-frames is the keeping of all ventilators closed 

 with mosquito netting. In cases where the eggs and caterpillars 

 are carried in on the plants when transplanted, the most practical 

 means is hand-picking. A sharp lookout should be maintained 

 for the castings on the leaves and for eaten leaves. When the 

 latter are found a careful search will generally result in finding 

 the caterpillar trying to mimic a leaf petiole. 



In the Field, 



It is when this pest occurs in destructive numbers in the field 

 that it passes beyond all control by methods of cultivation and 

 })reventive measures. In the open field they are more destructive 

 to cabbage and related plants, such as cauliflower, Brussels 

 sprouts and rutabagas, which have a smooth leaf surface, than to 

 any other crop. The caterpillars usually feed on the under sur 

 face of the leaves. They can travel quite rapidly, and if they 

 find any foreign substance on the leaves, especially the upper 

 leaves of the cabbage, they travel to other parts of the plant, and 

 even to other plants. They are far more particulai' about what 

 they eat than is the "■ Imported Cabbage-worm.'' 



The " moths " or " millers " are swift flyers. As already stated, 

 they fly principally on cloudy days and early in the evening, 

 hence can not be captured as easily ;(« can tlip '' Imported Cab- 

 bage-butterfly.'' 



From their peculiar habits of feeding, it is impracticable to use 

 Paris green in the dry form, the same as used on potatoes for 

 the '* Colorado potato-beetle." Beside, if rain follows the appli- 

 cation of dry poison to cabbage and its related smooth-leaved 

 plants, the time and material are practically thrown away. 



