4 FARMERS’ BULLETIN 595. 
4-pound dosage of arsenate of lead, and only 66 per cent by the 2}- 
pound dosage of Paris green. On the fourth day after the applica- 
tion the number of worms on the 5-pound dosage arsenate-of-lead 
plat was still further reduced. On the other hand, the worms had 
increased in numbers upon the 4-pound dosage arsenate-of-lead plat 
and on the Paris-green plat. These results indicate that arsenate 
of lead can be made effective under conditions under which Paris 
ereen is practically a failure. 
EXPERIMENTAL ACRE AT CLARKSVILLE, TENN, 
During the summer of 1913 an experimental acre of tobacco at 
Clarksville, Tenn., was kept free of worms by the use of powdered 
arsenate of lead from the time worms appeared in destructive num- 
bers until worms ceased to appear. Four applications were made, 
using a total of 124 pounds, an average of a little more than 3 pounds 
per dosage. However, the first dosage was too light, only 24 pounds, 
and had to be repeated. Had the first dosage been at the rate of 
about 4 pounds per acre, undoubtedly two more dosages of about 34 
pounds per acre would have been sufficient to do the work accom- 
plished by the four applications. The total cost of the arsenate of 
lead and labor (assuming the arsenate of lead to retail at 25 cents 
per pound) was only $3.86, an average cost of 77 cents per week for 
the five weeks over which the dosages remained effective. _ 
The first dosage was applied while the worms were small, and the 
repetition of the dosages at intervals of about 10 days prevented the 
growth of large worms. No hand worming was done upon this 
acre and no tobacco was injured either by the worms or by the ar- 
senate of lead. 
THE 4-ACRE FIELD AT PEMBROKE, KY. 
On August 12, 1913, 4 acres of large tobacco upon the farm of Mr. 
R. Y. Pendleton, at Pembroke, Ky., were given an application of 54 
pounds per acre of powdered arsenate of lead. At the time of the 
application the worms averaged two per plant. On August 14, or 
two days later, only four live worms were found on the entire field. 
The examination was made by walking across the field in opposite 
directions and examining numerous plants. There was no injury to the 
tobacco from poison burn. No more poison was applied to this field 
and practically no hand worming was necessary during the remainder 
of the season. This very remarkable result is explained in part by 
the fact that very little rain fell during August, and by the fact that 
comparatively few eggs were laid upon this tobacco after the middle 
of August. If worms had been numerous during the latter part of 
August and the weather rainy, undoubtedly another application 
would have been required. 
