-572 - 
.Experiments continued on the same lines as in the previous year 
[Rev. Appl. Ent. (A) 11: 358] indicate the effectiveness of nicotine dus 
( sulphur- lead arsenate 90;10 with 2 percent nicotine) on apples in the 
early pink stage for the control of aphids, 
SABERS, G. '£, (2392) 
1923. DUSTING VERSUS SPRAYING. Quebec Soc. Protect. Plants 15th Ann. 
1922-1923, pp. 34-39. [Abstract in Rev. Appl. Ent. (A) 11: 476. 1923 
The employment of nicotine as a dust has progressed to such an 
extent that it gives much more satisfactory control of sucking insects, 
apart from coccids, than spraying. The most successful nicotine dust 
consisted of a total of 6 percent of nicotine sulphate. These dusts 
were effective against the pea aphid, potato aphid, and pear psylla. 
ANONYmOUS -(2393) 
1924. CONTROL OP APHIDS ON CITRUS. Citrus Indue* 5 (5): 22. 
In Florida it is recommended that citrus trees bearing aphids 
be dusted. Ail things considered, the most satisfactory control 
measure was found to be a thorough dusting with a 3 percent nicotine 
sulphate lime dust. If not eo^uipped for dusting, a thorough spray- 
ing with 40-percent nicotine sulphate, at least 1 to S00, with some 
spreader added may be applied to advantage. 
BEYER, A. H t (2394) 
1924. LIPS HISTORY CP THE NEW CITRUS APHIS. Fla. Ent. 8 (l): 8-13. 
[Abstract in Rev. Appl. Ent. (A) 12: 446. 1924.] 
Nicotine dusts do not scorch the tender foliage of 4-year old 
citrus trees as does calcium cyanid; and are also less destructive 
to the natural enemies of this unidentified aphid. 
PARROIT, P. J. (2395) 
1925. SOkE PRACTICAL POINTS RELATIVE TO CONTROL OP ROSY APHfs. N. Y. 
State Hort. Soc. 70th Ann. meeting, pp. 17-22. [Abstract in 
Rev. Appl. Ent. (A) 14: 73. 1926.] 
The most effective spray for the control of the rosy aphid on app] 
is lime-sulphur 1 to 8 plus nicotine sulphate (4 percent) 1 to 800. 
This is also effective against San Jose Scale and scab but if lepidopterc 
larvae are present 3 lb. powdered lead arsenate should be added. Dusts 
are less satisfactory but if preferred they should contain not less 
than 2 percent nicotine. 
ZAPPE, k. P., and STODDARD, E. M. (2396) 
1925. DUSTING VEr.SUS SPRAYING. SEASON OP 1924. Conn. Agr. Expt. Sta. 
Bull. 265, pp. 286-292. [Abstract in Rev. Appl. Ent. (A) 13: 413. 
1925.] 
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