New YorkK AGRICULTURAL EXPERIMENT STATION. 21 
poses has not been thoroughly established, and more knowledge on 
the safeness and efficiency of this treatment has been desired. Bul- 
letin No. 302 is a contribution of additional data, which are based 
on experiments to determine: (1) The effectiveness of the lime- 
sulphur wash as a dip on the San José scale, and (2) the effects of 
dipping in this mixture upon the health of nursery trees. 
Tests were made with the standard lime-sulphur wash at tem- 
peratures of 60°, 100°, 120°, and 212° F. For purposes of com- 
parison, experiments were also made with kerosene emulsion, con- 
taining 10, 15, and 20 per ct. of oil; miscible oil diluted with 10, 
15 and 20 parts of water; and hydrocyanic acid gas at the rate of 
0.3 gram of potassium cyanide per cubic foot. The stock used for 
these tests was 180 3-year old Bartlett pears and 970 3-year old 
Ben Davis apples, all of which were infested with the San José 
scale; and 300 Mann apples, 470 Bartlett pears, 300 Satsuma plums 
and 300 Fitzgerald peaches, all of which were clean and healthy 
LECeS. 
While good results were secured from some of the spraying mix- 
tures used in these tests, the practice of dipping cannot be recom- 
mended as.a general substitute for fumigation with hydrocyanic gas. 
None of the mixtures were as effective on the San José scale as 
the gas, except under conditions destructive to the trees, while 
fumigation, if properly conducted, is harmless. 
Control of leaf blister mite in apple orchards.— Bulletin No. 306 
deals largely with experiments to determine the comparative merits 
of various sulphur sprays in preventing spotting of apple foliage by 
the leaf blister-mite. The mixtures that were tested were the 
boiled lime-sulphur wash, the home-made concentrated lime-sulphur 
wash, and two commercial preparations; and all of them gave 
equally satisfactory results. One application of either of these 
sprays has practically prevented spotting of foliage by the mite. 
With the increased availability of the sulphur sprays these are 
recommended as practicable remedies for the treatment of apple 
orchards. A plan of spraying that is well adapted for the treat- 
ment of apple trees is an application of a sulphur wash as the buds 
are swelling and before the leaves appear, followed by the usual 
second and third applications of the bordeaux mixture in their 
proper season. 
