-4— 
H. G. Butler, of the Harriman, Tenn., laboratory, reports the fol- 
lowing results from tests in peach orchards against the plum curculio: 


cere creer a a se a A ET AO A OE ACY ENN ts TE AO CLT 



| | Per cent 
Plat| Treatment |curculio infestation 
1 | Barium fluosilicate 1-50 10.3 
| (with sulphur 8 lbs., talc 4 lbs.) 
2 | Cryolite 1-50 | 6.9 
| (with sulphur 8 lbs., tale 4 lbs.) | 
| | | 
3 | Potassium fluosilicate 1-50 | 22.8 
| | | | 
4 | Lead arsenate 1-50 | Ih! 
| (with sulphur 8 lbs., hydrated lime 4 | 
| lbs., calcium caseinate 1/2 lb.) | 
| | 
5 | Check (sprayed with sulphur fungicide) | Ries | 
| elite | 
6 | Check (no spray) | 27.8 


"No foliage injury of any importance was noted." 
The following notes dn work conducted at the grape insect labora— 
tory at Sandusky ,Ohio, under the direction of G. A. Runner are based on 
Mr. Runner's monthly reports and particularly on a recent field inspec— 
tion of the situation by B. A. Porter: 
The grape industry in northern Ohio is facing an extremely diffi- 
cult situation, because of grape berry moth, spray residue, and low 
prices. It has been definitely demonstrated that the control of severe 
infestations of the grape berry moth by spraying is certain to result in 
excessive spray residue. The standard recommendations call for two 
sprays of lead arsenate, although in many vineyards the growers have 
found three applications necessary for satisfactory control. In severe 
infestations the control of the berry moth with shortened spray programs 
has been very unsatisfactory. 
Mr. Runner has conducted a large number of tests of possible sub-— 
stitutes for lead arsenate, including the fluosilicates of potassium, 
sodium, and barium, and the fluoaluminates of Sodium and potassium. All 
of these ,aithough showing promise in the laboratory, have failed in 
controlling the berry moth in the field, and in addition have caused 
severe injury. Failures to control have also characterized the use of 
rotenone, of oil sprays, and of oil in combination with nicotine. | 
