New Yorx AGRICULTURAL EXPERIMENT Sration. 417 
Treatment for oyster-shell bark-louse.—Treatment may be made 
in the spring by spraying the trees as soon as the eggs hatch, 
either with whale oil soap, one pound to seven gallons of water, 
or kerosene emulsion, one part to seven parts of water. One or 
more applications should be made as required. For treatment of 
scurfy bark-louse, see page 450, and for San Jose scale page 449. 
GENERAL TREATMENT AGAINST DISEASES AND INSECTS WHICH ATTACK THE 


APPLE. 
When to spray. What to use and what the treatment is for. 
1. Just before leaf buds burst........ Paris greenl2 against bud moth and 
case-bearers. 
2. Just as leaf buds show green at the 
tips. About a week later than1.| Bordeaux mixturel3 against scab, 
canker disease and leaf spot. 
Paris greenl2 against bud moth, case- 
bearers, canker worms, tent cater- 
pillar and various other leaf-eating 
insects. 
3. Just before blossoms open. From 
seven to ten days later than 2,| Bordeaux mixturel3 against scab and 
leaf-spot. The most important single 
application. Apply thoroughly. 
Paris greenl2 against canker worms, 
tent caterpillar and various other 
leaf-eating insects. 
4, Just after blossoms fall.......... Bordeaux mixturel8 against scab and 
leaf-spot. A very important appli- 
cation; make it promptly and thor- 
oughly. 
Paris greenl2 against codling moth, 
canker worms, tent caterpillar and 
numerous other leaf-eating insects. 
The most important application 
against codling moth. 
5. From ten to fourteen days after 4. | Bordeaux mixturel3 against scab and 
leaf-spot. If weather has been cool 
and wet, apply with especial thor- 
oughness. 
Paris green!2 against codling moth. 

12 Paris green should be used at the rate of one pound to 150 gallons of 
water. If used alone, about two pounds of fresh slaked lime should be added 
to make it adhere and to prevent injury when applied to foliage. Green ar- 
senite of copper, arsenite of lime, or other poison may be used instead of the 
Paris green, as directed in Bulletin 121. Paris green or the other arsenicals 
may be used with Bordeaux mixture. In that case, it is not necessary to add 
much extra lime. 
48 Use Bordeaux mixture 1-to-11 formula. Pure copper sulphate solution, 
1 pound to 15 gallons or more, may be used when there is no foliage. It is 
cheaper, but does not adhere so well as does Bordeaux mixture. Directions 
for making and applying these mixtures are given in Bulletin 121. The Paris 
green or other arsenicals may be mixed with the Bordeaux mixture, and both 
may be thus combined in one application. 
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