INJURIOUS INSECTS AND FUNGI. 263 



injury in sufficient quantities to destroy any injects that 

 feed by biting or chewing the parts. Samples containing 

 more than four per cent of soluble arsenious acid should 

 be used with considerable caution. 



ARSENATE OF LEAD is similar in effect to Paris green, 

 but is a combination of arsenic with lead instead of copper. 

 It is less soluable than the former, adheres longer to the 

 foliage and will not burn the leaves when used in large 

 quantities. It can be used with the Bordeaux mixture 

 and, being a white powder, may be more readily detected 

 upon the leaves. In cost it is about the same in price 

 per pound as Paris green, but about twice as much 

 is needed to do effectual work. Arsenate of lead may 

 be used as a dry powder with lime or flour or in 

 water. 



PARIS GREEN AND PLASTER, LIME, OR FLOUR. la 

 order to distribute Paris green more thoroughly and 

 economically in a dry form it is often mixed at the rate 

 of 1 Ib. to 10 up to 50 Ibs. of plaster or air-slaked lime or 

 with from 10 to 20 Ibs. of fine dry cheap flour. All of 

 these substances possess some merit, but the two first are 

 nearly as readily washed off by rains as the Paris green 

 itself, while the latter when once moistened forms a paste 

 that upon drying svill remain on the foliage for a long time. 



PARIS GREEN IN WATER. i5y far the best method of 

 applying this poison is mixed with water and applied 

 with a nozzle that will make a very fine spray or mist. In 

 this way it is more evenly distributed over the foliage or 

 other parts, adheres better, and if lime is used in the water 

 there will be much less danger from injury than if used in 

 the dry form. 



