ARSENATE OF LEAD AGAINST TOBACCO HORN WORMS. 3 



grown or two-thirds grown worms have become dangerously nu- 

 merous, and has then put on a large and uneven application with the 

 hope that he would kill all the large worms. This is an example of 

 poor judgment. Two applications should have been made. Ths 

 first should have been smaller and at an earlier date in order to kill 

 the Avorms while small, and also to lessen the danger of burning the 

 tobacco. The second application should follow as soon as worms 

 begin to increase in numbers after the first application. 



OBJECTIONS TO THE USE OF PAKIS GREEN. 

 DANGER TO THE OPEEATOB. 



There is occasionally some injury or irritation to the operator in 

 applying Paris green. "Wlierever Paris green strikes the tender 

 parts of the body irritation soon occurs unless a thorough bath be 

 taken promptly. Bleeding at the nose sometimes occurs as a result of 

 the irritation to the mucous membranes. For these reasons many 

 people dislike to apply Paris green. However, if care is taken to 

 work in a direction quartering the breeze and upon the windward 

 side of the row while making an application, a thick sack around 

 the body and a sponge over the nose will be found to be excellent 

 preventives of irritation, particularly if followed by a bath. 



INJURY BY PARIS GREEN TO TOBACCO. 



The very general complaint of loss due to Paris-green-burned to- 

 bacco has been found to be justified. Under favorable weather con- 

 ditions 2 pounds of Paris green per acre, sometimes more, may be 

 applied without noticeable injury. On the other hand, unfavorable 

 weather conditions will frequently cause injury to follow an appli- 

 cation of only 1 pound per acre. Very hot suns and low humidity 

 for an extended period will produce a condition of the tobacco plant 

 very susceptible to Paris-green burn. Light rains or very heavy 

 dews immediately following an application will wash the Paris green 

 down into the axils of the leaves or into the furrows along the mid- 

 ribs, and serious injury is likely to result. 



In the Clarksville district of the dark-tobacco belt of Kentucky 

 and Tennessee Paris-green burn was quite severe during 1911 and 

 1912, particularly so in 1912. Previous to these years one of the 

 most careful growers in this district informed the writers that his 

 loss on a 6-acre field of tobacco, due to Paris-green burn, amounted 

 to 8 per cent gross, which was a loss of at least 16 per cent of the net 

 profit, and that many other growers suffered a similar loss in 1912. 

 In 1911 the writers observed many fields in which the loss equaled 

 or exceeded that quoted above. In 1912, however, the injury by Paris 

 green was more widespread than for several years, notwithstanding 



