IDEAL FERTILIZERS 83 



for when once dry the spraying solution is not so readily 

 washed off. Arsenate of lead, Bordeaux mixture and 

 Yothers' Formula No. 3, an insecticide, a fungicide and 

 a contact insecticide, respectively, are especially able to 

 withstand weather conditions when once dried on the 

 foliage. 



Dust spray should be applied to dew-wet foliage when 

 there is little or no air stirring. A slight misty rain 

 after application is of benefit. During damp, rainy 

 weather fungous growth develops much more rapidly, 

 and fields should be sprayed oftener than in dry seasons. 



What Form of Spray Extended experiments have 

 proved the wet spray to be the more effective. Where 

 there is no local reason against it, I advise wet spray in 

 practically all instances except for rust mite on citrus 

 trees, mildew on beans, the cotton caterpillar and the 

 corn-bud worm. The first because the dry sulphur is 

 effective against the rust mite and not so active against 

 tLe friendly fungi; the second, because the dry spray 

 destroys mildew and it can be applied in the morning, 

 when other work in the bean fields cannot be done, thus 

 saving valuable time; the third, because it is so econom- 

 ical in labor since the slight dust jarred through the bags 

 by the mule's movement is sufficient ; and, fourth, because 

 a tiny pinch of powder to each bud will do the work and 

 a spray pump would be wasteful of both labor and mate- 

 rial. In many gardens where team work is not used the 

 dry sprays are more economical because of the saving 

 of labor in carrying so much water. Such factors must 

 be taken into consideration. 



