, 
360 OHIO EXPERIMENT STATION: BULLETIN 214 
in the dormant period or just as the buds are swelling is effective 
against the scale insects and is also efficientasafungicide. The 
lime-sulfur has very largely displaced other fungicides against leaf- 
curl of the peach. More recently the self-boiled lime-sulfur formula 
has been proposed. It promises to be effective upon peach trees in 
foliage. ‘This isa much more dilute formula than the one used upon 
dormant trees; both are described in the spray calendar. Latterly, 
various dilutions of the lime-sulfur residues formed when lime and 
sulfur are boiled together, have come into use as sprays for 
orchard use. 
SOLUTIONS FOR SEED TREATMENTS AND DISINFECTION: 
FORMALDEHYDE SOLUTIONS 
Formaldehyde in 40 percent solution is obtained upon the market. 
Solutions of this 40 percent compound in water are effective in seed 
and soil treatments and for disinfection. The following are standard 
strengths: 
For oats and wheat, 1 1b, or pint 40% formaldehyde to 40 or 50 gals. water, 
For potato scab and rosette, % pint of formaldehyde to 15 gals. water. 
For onion smut, 1 1b. of formaldehyde to 25 or 33% gals. of water. 
For soil drench, 2 to 4 1bs, of formaldehyde to 50 gals. of water. 
CORROSIVE SUBLIMATE SOLUTION 
For treatment of potato tubers and for laboratory disinfection, 
mercuric chlorid, corrosive sublimate, is used as follows: 
Corrosive sublimate 00... .....cccceccsecsscsnesesceuee eee 2 ounces. 
Water rns isis ceauecsessreanenanen le @atiakeeey 15% gallons, 
GASEOUS DISINFECTION WITH FUNGICIDES 
Latterly the methods used for the disinfection of houses wherein 
patients have suffered from contagious diseases such as diphtheria, 
scarlet fever, etc., have been extended to the treatment of plant 
diseases. The following formula of the Maine Board of Health is 
applicable to the details below given: 
FORMALDEHYDE GAS 
Commercial 40% formaldehyde ...........cccsceccees 3 pounds, 
Potassium permanganate crystals .........0...... 23 ounces. 
Sufficient for 1000 cu. ft. of space occupied by crates or 
trays. . 
The following suggestions from the spray calendar of 1908 will 
be helpful tostudents or experimenters who have not access to other 
literature: 
“Enclose open tiers or piles of slat crates filled with dry onions, 
potatoes, etc., in tight room or oiled tent of canvas buried in earth 
about the base. Generate the formaldehyde gas in a flat bottomed 
