INSECT AND FUNGOUS ENEMIES OF THE APPLE. 43 
Arsenite of lime is recommended by Stewart! as an arsenical for 
use in lime-sulphur solution, but when so employed the Kedzie for- 
mula should be somewhat modified as follows: 
VLC eY RSS Oa ae bs ere Poe ee ee eee pounds__ 2 
Sal coda Gry stale taee ee ap. PAN A NS do. 2 
AWGN Ss he 2 es 2 ox ty | AST eS PS a ee eee See ee gallons__ 1% 
Boil the above ingredients together in an iron vessel until entirely 
dissolved, which will require about 15 minutes. This solution is 
then used to slake 3 or 4 pounds of best stone lime. If the slaking 
is thoroughly done, the arsenic will be well combined with the lime 
and the product will retain its strength indefinitely. After slaking, 
add enough water to bring the total up to 2 gallons. This is a stock 
solution, which after having been labeled to indicate its poisonous 
nature, may be stored for use as needed. The stock solution, after 
thorough stirring, is used at the rate of 2 pints for each 50 gallons 
of lime-sulphur spray and contains the equivalent in arsenic of one- 
half pound of Paris green. 
This preparation may be used equally well in Bordeaux mixture. 
Paris green may be used in Bordeaux mixture at the rate of 5 or 
6 ounces for each 50 gallons of spray. This poison, however, should 
not be used in lime-sulphur spray. 
SCHEDULE OF SPRAY APPLICATIONS. 
In connection with the several insects and diseases previously re- 
ferred to, information has been given as to the treatment to be 
employed in their control. It rarely happens, however, that the 
orchardist has to consider only one or two of these troubles, there 
being present as a rule several important insect or fungus pests which 
must be considered. Fortunately for the orchardist, many of his 
most serious troubles permit of control by a few well-timed applica- 
tions of a combined insecticide and fungicide, such as lme-sulphur 
wash and arsenate of lead. It is, therefore, possible to indicate a 
schedule of applications which has been found satisfactory to protect 
fruit and foliage from injury. An outline of this kind, however, 
must be very elastic to apply to the varied conditions obtaining in 
the various orchard sections of different parts of the country, as, 
for instance, in the New England States and in the Ozark region of 
Arkansas. The orchardist, therefore, must know what his troubles 
are in order to save himself the expense of unnecessary treatments, 
on the one hand, and of serious loss, on the other, on account of 
failure to spray where such work is desirable. The following sched- 
ule of applications is recommended, and if carefully followed out it 
1 Bul. 99, Pennsylvania Agricultural Experiment Station. 
21f the anhydrous or water-free sal soda is used, one-half the quantity will be sufficient. 
492 
