- 553 - 
The spray formula recommended for the control of My zus ribis L. 
on currants is 1 pt. nicotine sulphate, 5 lb. soap and 100 gal. water. 
Hydrated lime or superfine dusting sulphur should "be used as the 
carrier in preparing home-made nicotine sulphate dusts. Dusting should 
"be done as far as possible on still days, when temperatures are high 
and there is as little moisture as possible on the foliage. 
VORHLES, C. T. (2315) 
1924. THE GRAPE LEAF-HOPPER DTA2IZ0NA. Ariz. Agr. Expt. Sta. Timely 
Hints for Farmers Ho. 146, 14 pp., illus. [Abstract in Rev. Appl. 
Ent. (A) 12: 304-305. 1924.] 
. Measures against the adults of Erythroneura comes Say are 
usually not successful, spraying being practically useless, as 
they are very active and also resistant. Dusting with two machines 
at once was fairly successful, one man and machine driving the 
adults out of the vine to the opposite side. The dust used must 
contain 7 1/2 to 10 percent of nicotine and must be applied on a 
warm, calm day. The most effective measure is to spray the nymphs 
with 40-percent nicotine sulphate, 1./2 pt. to 100 gal. water (or 
double this strength), with soap at the rate of 4 lb. to 100 gal. 
Suitable machines for spraying and dusting are described. Dusting 
was the cheaper method and was effective when thoroughly done. 
WATSON, J. R. (2317) 
1924. THE APHIS SITUATION. Citrus Indus. 5 (6): 20. 
The experience of A. H. Beyer in Florida is that the most ef- 
ficient insecticide against the new citrus aphid is nicotine sulphate- 
lime dust. On small trees it is best applied with a good hand duster. 
Spraying with lime -sulphur and nicotine sulphate solution, or 
oil emulsions, h r: ve also given good results. We advise this method 
of combating the aphid in groves that need spraying for scale and 
whitefly. In groves in which rast mite is appearing, spray with a 
solution of one part of nicotine sulphate to 800 parts of standard 
lime- sulphur solution. 
WATSON, J. R. , and PETER, A. H. (2318) 
1924. THE NEW CITRUS APHID. Citrus Indus. 5 (11): 30-31. 
Spraying with nicotine sulphate (1 to 800) was quite successful 
against this aphid ( Aphis spiraecola Patch or possibly A. pomi ) when 
the spray was applied before the infestation had curled the leaves. 
The most practical means of control, after the leaves are curled, 
seems to be by the use of nicotine dust of at least a 3-percent 
strength. Take 100 lb. hydrated lime and add 7.5 lb. of 40-percent 
nicotine sulphate. This should be put in a. 50-gal. barrel, which 
may be arranged like an old fashioned churn, and thoroughly mixed 
(p. 31). 
