DDT can be used either in dust or spray form. As a dust the five per cent concen- 
tration is preferred, and best results are obtained when it is applied early in the morn- 
ing while the plants are still moist. 
The fifty per cent wettable powder can be used as a spray at the rate of two pounds 
per hundred gallons of water or three or four pounds of the twenty-five per cent 
can be used. Since gladiolus foliage is difficult to wet, a spreader-sticker should 
be added. 
Although flowering spikes may just be developing, do not wait to get them pro- 
tected against thrips. Much of the damage done occurs while the buds are still in 
the sheath. 
Watch for signs of disease. Destroy those that show any signs of wilting, yellowing 
or streaking before the disease spreads through the rest of the planting. 
STREET, SAN FRANCISCO 3, CALIFORNIA 
