- 7 - 
The powder is very light, and a pound will treat a large number of 
plants. 
A remedy much recommended by Dr. Riloy is hot water. 
Water may be poured boiling hot into a watering-pot and applied 
at once to the caterpillars, and, it the plants are not too thoroughly 
drenched, the latter will not be harmed, while all the worms 
touched by the water will be destroyed. Worms that are protected 
upon the under side of the leaves cannot, of course, be treated. 
Kerosene emulsion, if applied in extra strength and with con¬ 
siderable force, will also kill many of the worms, but I have not 
found this substance of much value in destroying the larva? of 
Pieris rapse. 
THE SOUTHERN CABBAGE BUTTERFLY. 
(Pieris protodice Bd.) 
This insect [Figs. 4 and 5] resembles the preceding in the ma¬ 
ture state, and has very similar food habits. It is a native of North 
America, and does its chief injuries in the Southern States. It is 
Fig. 4. Fig. 5. 
•quite abundant as far north as Fort Collins, and, only a few * years 
•ago, was said to do more harm to cabbages in Colorado than the 
preceding species. The markings of this butterfly, both male and 
♦Bulletin 6, Colorado Experiment Station, p. 15. 
