-32 - 
pp. 4-5: Insects visit the flower ( Brassi ca oleracea) freely. 
Honeybees, although usually plentiful, often fail to be very efficient, 
because they do not work at temperatures below 60 c F. Bumble-bees are 
not very plentiful in California, but usually a few of them are col- 
lecting pollen in nearly every field. 
P • 7 : Cross-pollination w h ich is .the ...rule- in Brassica is 
usua lly brought a bout _by_ insect visitation. Bees a re the active p oli- 
nating agents . 
Clover, Alsike 
Megee, C, R. , and Kelty, R. H. 
1972. The influence of bees upon clover and alfalfa seed production. 
Mich. Agr. Expt. Sta. Quart. Bui. 14 (4): 271-277. 
p. 277: The honeybee was found to be a very effective pol- 
linating agent for June and alsike clov ers a nd for alfalfa and the 
presence of large numbers of bees resulted in marked Inc reases in V e 
seed crops_of_these_legi;umes . 
United States Department of Agriculture. 
1942, A much larger harvest of hay crop seeds needed in 1942. U. S. 
Dept. Agr., Food for Freedom Program, Background Information 
Series, No. 7, 5 pp. 
p. 3: The placement of one hive of honeybees per acre adjacent 
to or in an alsike field will mate rially incr ease s eed pr oduction . 
Clover, Crimson 
Hollowell, E. A. 
1933. Crimson clover. U. S. Dept. Agr. Leaflet 160, 8 pp. 
p. 8: Crimson clover is a prolific seed-producing plant and 
yields of 5 to 10 bushels per acre are common, depending upon the 
thickness of the stand, the amount of growth that is produced, and the 
care exercised in harvesting the seed. The florets are self-fertile, 
but b ees a re_.. ef festiv e in tripping and transf erring the_pollen^_witIi a. 
c onsequ ent increase in the numbe r of seed per head. Th e p lacing of 
colonies of honeyb ees_ ad i agent to blo oming f ields w ill effectivel y in - 
crease pollination . 
Clover, Ladino White 
Hollowell, E. A. 
1942. Ladino white clover for the Northeastern States, U. S. Dept. Agr. 
Farmers' Bui. 1910, 10 pp. 
p. 10: Because cross-pollination is necessary for seed forraa- 
t ion, it is advisable to move hiv e s of ho n eybees adjacent to the 
