34 BULLETIN 1032, TJ. S. DEPARTMENT OF AGRICULTURE. 
plats E, F, G, and H, but particularly on H, it was noticed that the 
berries were generally much larger and the vines of a brighter green 
than those on the other plats. Wherever this spray solution was used 
it seemed to have a fertilizing or stimulating effect on the vines, 
making them grow more luxuriantly and produce larger sized berries 
than they otherwise would have done. 
RECOMMENDATIONS FOR CONTROL. 
REFLOWING. 
As recommended by Scammel, 13 reflowing, where it is possible to 
do it properly, will doubtless be as effective in controlling the black- 
head fireworm on the Pacific coast as elsewhere. While no experi- 
ments were performed along this line on the Pacific coast, yet for the 
benefit of those growers who may be able to equip their bogs for 
reflowing and wish to employ this method of control, it might be 
stated that the proper time to reflow for the fireworm is when the 
majority of the larvae of the first brood are about full grown, as at 
this time they can be more easily and quickly killed than in any other 
stage. 14 On the bogs in the vicinity of Sea view, Wash., the majority 
of the larvae of the first brood are full grown near the middle or 
latter part of May, but if the bog is winter flowed, i. e., covered 
with water in the wintertime, this date would vary according to 
the elate this winter flood was drawn from the bog. In reflowing, the 
water should completely cover the vines and be held there for at least 
48 hours in order to kill the greatest number of larvse. Any grass or 
other objects projecting above the surface should be removed so that 
the larvae can not crawl up to the tops and thus escape the flood. 
SPRAYING. 
Spraying with a solution of 40 per cent nicotine sulphate and 
water, with soap as a spreader, has been found to be the most effec- 
tive method of controlling the blackhead fireworm on the Pacific 
coast. 
How to Prepare the Nicotine Sulphate Spray. 
Any nicotine solution containing 40 per cent of nicotine sulphate 
is suitable in the preparation of this spray, and any kind of soap 
free from uncombined oils or greases may be used as a spreader. 
The proportions found most effective against the fireworm are : One 
part of 40 per cent nicotine sulphate to 800 parts of water, with 2 
pounds of soap to each 50 gallons of the liquid. Solutions containing 
a greater proportion of nicotine sulphate than 1 to 800 will do no 
18 Scammel, II. B. Cranberry Insect Problems and Suggestions for Solving Them. 
I". s. Dept. of Agr., Farmers* Bulletin 860, p. 7-8. 1917. 
14 Ibid, p. 8. 
