24 BULLETIN 289, U. S. DEPARTMENT OF AGRICULTURE. 
TasLe VII.—Average seed yteld of clover heads which were struck horizontally with different 
types of brushes and either protected or unprotected from insects at La Fayette, Ind., in 
TSM 
Heads left uncov- | Heads covered with 
Strokes ered. tarlatan. 
per 
treat- 
ment. Heads |Seedsper| Heads | Seeds per 
worked. head. worked. head. 
Brush used. 
SNE NR StS As Sry Be ea a Ra 1 3 37.4 1 0 
HSE ee 2 eee ed EEE: _ EOE De AU ge RO ee ae 1 5 38.8 ib 0 
BS ec i Sc eet pe PE as td BY rs one em 1 5 50.1 2 0 
(OLOGY ole AS Aceon ah Ue en hea a wee ee OI uae 1 3 60.8 if 0 
1 Do aapae Eines MRS Spee RMI ek Neies Na ae see Salle ee oN. it 5 a & 1 0 
dB cyt herein athe cnc heent cto ie Meo Oooh NS CBS 1 5 60. 1 2 0 
Table VII shows that in each case of the heads left uncovered the 
check produced the most seed. As in Table VI, the brushes appar- 
ently reduced the seed production. It will be noted also that both 
the brush-treated and untreated heads produced no seed when 
protected from insect visitation. 
Experiments to test the relative efficiency of horizontal strokes 
with the different brushes were also conducted at Ames, in the sum- 
mer of 1911. Ten plats 4 feet square were used. These plats were 
marked off by placing stakes at the corners and connecting these 
stakes with heavy cord. Plats 1 to 8 were each given one treatment 
on each of three consecutive days, with brushes B, A, E, C, F, D, G, 
and H, respectively, and plats 9 and 10 were left as checks. Dupli- 
_cate tests, using the same brushes, respectively, on plats 37 to 44 
were also made. The results are shown in Table VIII. 
Taste VIII.—Average seed yield per head obtained when clover heads were struck horizon- 
tally with different types of brushes at Ames, Towa, in 1911. 
Original tests. Duplicate tests. 
Strokes Aer 
Brush used. per treat- eich 
ment. ments." | Plat | Heads Seeds Plat |} Heads Seeds 
No. | worked. | perhead.| No. | worked. | per head. 
DB eee a ea ee anid ea NL LN 1 3 1 464 44.8 37 438 44.9 
NS Seat or See Sle ay SO NY Gos NE if 3 2 476 41.1 38 515 43.2 
Be pee ae A te ee I OO 1 3 3 457 42.6 39 490, 30.1 
Chae etn Ser Eee 8 5 ee a ens 1 3 4 322 46.2 40 485 42.5 
Eye ieee mew Rilo Yas SECS 1 3 5 440 43.9 41 470 47.5 
[Dee Sete eae te Ua eas ee 1 3 6 435 36.2 42 445 33.0 
Geers Ge it i ae eee 1 3 7 320 45.1 43 460 39.9 
Te Eocene 1 3 8 430 41.0 44 432 42.9 
LO) CVE ep Se em as ad i ee Dn Faces Tia Were Se Sie g 532 55.4 9 532 55.4 
1G Oar Se SST TC TK dt a eis 10 470 50.9 10 470 50.9 
Table VIII shows that in every case where brushes were used the 
seed production fell below the yield of the check plats. 
From the results obtained in Tables VI, VII, and VIII it is con- 
cluded that at least horizontal strokes with the brushes in question 
reduced the seed production on account of the flowers being muti- 
lated by the brushes. 
ee 
—oorrr Ss ss sserasnwr ae 
