Tue CLover SEED CHALCID 105 
Owing to the inability of the owner to get a clover huller, a 
threshing machine was used and this did such poor work that it is im- 
possible to give an accurate report of the yield. 
In 1913 P. C. Daley, Lewiston, Minnesota, allowed the use of his 
field for co-operative experiment. Three plots of one acre each were 
selected, these having a uniform stand. They were treated as follows: 
Pilot: 
Clipped back, June 1. 
Clipped again, July 1. 
Cut for seed, October 1. 
Infestation, 16.7 per cent. Yield per acre, 87 pounds. 
Plot IT. 
Cut for hay, July 15. Heads all ripe. 
Cut for seed, October 1. 
Infestation, 31.7 per cent. Yield per acre, 38 pounds. 
Plot ll 
Cut for hay, July 3. Most of heads turning brown. 
Cut for seed, October 1. 
Infestation, 17 per cent. Yield per acre, 54 pounds. 
In 1914 red clover was available for experimental purposes at 
University Farm, Saint Paul. Two plots were used, No. I being on 
series 6, Field E, and No. II on series 7, Field E. Each plot was 130x 
132 feet. They were treated as follows: 
Plotel: 
Cut for hay, June 17. Heads pink. 
Not cut for seed because of severe infection of clover rust, Uromyces trifolii. 
Ripe heads collected October 23 and seeds examined for larvae of clover seed 
chaleid. 
Infestation, 2 per cent. 
Plot II. 
Cut for hay, July 17. Heads all brown. 
Not cut for seed because of clover rust. 
| 
Ripe heads collected October 23 and seeds examined. 
Infestation, 8S per cent. 
It is evident from these results that early cutting of the first crop 
reduces the amount of infestation in the second crop sufficiently to 
make it a valuable preventive measure. 
Attention must be given also to first-year red clover in the seeds 
of which the chalcid may breed and be carried over the winter to infest 
the crop of the second year. Clipping off the heads or pasturing can 
be recommended in this case. Volunteer clover, being almost always 
infested by the chalcid, should be kept down as much as possible. 
