10 



MASS. EXPERIMENT STATION BULLETIN 409 



Laboratory Experiments 



Preliminary laboratory experiments in 1939, in which about 20 eggs on cut 

 canes collected in the field were sprayed in the laboratory, indicated that oil 

 emulsion, sodium dinitro cresylate, and liquid lime-sulfur were promising; but 

 that peanut oil emulsion, a commercial rotenone spray, and a commercial cyclo- 

 hexylamine mixture were less satisfactory. 



Other laboratory tests in 1940 showed that oil emulsions and the greater 

 concentrations of sodium dinitro cresylate were very toxic to the eggs, but that 

 liquid lime-sulfur was less efifective. These experiments are summarized in 

 Table 6. 



Table 6. — Effect of Dormant Sprays on Eggs of the Grape 



Plume Moth in the Laboratory. 



Waltham, Mass., 1940 



Material' 



None 



Liquid lime-sulfur 11^ 



Oil emulsion (Spra-Cream) 



Actual oil 1% 



2% 



3% 



4% 



Oil emulsion (Kleenup) 

 Actual oil 3% 



Oil emulsion (Nitro Kleenup) 

 Actual oil 3% 



Sodium dinitro cresvlate 



¥2% '. 



M% 



1 % 



1M% 



'See notes for Table 7 



23 



37 



31 

 21 



31 



28 



16 



11 







2 



100.00 



100.00 



48.38 



47.61 



100.00 



92.85 



Field Experiments 



Following the laboratory studies, experimental dormant spraj's were applied 

 to heavily infested backyard vines in 1939, 1940, 1941, and 1942. In 1939 and 

 1940 the sprays were applied from a wheelbarrow sprayer producing about 125 

 pounds pressure from a hand-operated force pump, and in 1941 and 1942 a motor 

 driven pump delivering about IJi gallons per minute at 250 pounds was used. 

 The spray was applied very thoroughly and an attempt was made to wet all 

 parts of the vines but this was difficult on some vines which had been pruned by 

 the "haircut" sjstem and afforded many protective crevices. No significant 

 differences in the results from the two types of spraying equipment occurred 



