PRINCIPLES OF WEED CONTROL 



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FIG 269 Noxious weed seeds found in farm seeds: a, Indian mustard: b, hare's- 

 ear mustard; c, tumbling mustard; d, wild carrot; e, field bindweed; /, flax dodder: 

 g, clover dodder; h, small-seeded alfalfa dodder; i, field dodder; j, large -seeded alfalfa dodder; 

 k, corn gromwell; /, rat-tail plantain; m, buckhorn; n, ragweed; o, gum weed; p, wild sun- 

 flower; q, oxeye daisy; r, Canada thistle; s, bull thistle; t, wild chicory. (Enlarged and 

 natural size.) (U. S. D. A. in Fights of the Farmer.) 



