200 



PLANT GROWTH SUBSTANCES 



TABLE 2 



Response of Minerva, Dakota, and Redwing flax to applications of methoxone 

 and 2,4-D made under variable growing conditions. 



* (Number of plants affected) x (scale of to 3 for degree of bending) divided 

 by (total number of plants). 



to 2,4-D. Although varietal differences exist, they are not constant 

 under all conditions. 



Dunham et al. (14) have pointed out the association of rapid growth 

 and stage of plant. Thus, the small grains commonly grow slowly until 

 well tillered, a stage relatively tolerant. The following period of jointing 

 or shooting is one of rapid elongation under favorable growing conditions 

 and is generally a more susceptible stage. Likewise in flax the period 

 of stem elongation is commonly avoided in spraying for, under favorable 

 conditions, it is one of rapid growth. 



Numerous investigators have reported reduced yields from plants 



