Stewart's disease of maize: technic 165 



milk, Uschinsky's solution and Cohn's solution need be tried 

 further. 



For inoculation purposes select first of all seedling plants 

 and inoculate from young potato or agar streaks on the leaf- 

 tips when the plants are 2 to 3 inches high and show only 

 2 or 3 unfolding leaves. The inoculations may be made by 

 spraying or by touching the leaf-tip with an infected platinum 

 needle. After inoculation the young plants may be placed 





Fig. 106 — Corn husk in cross-section showing vessels and intercellular spaces 

 of the parenchyma (dark areas) filled with Aplanobader stewarti. Stoma oozing 

 bacteria at A'. See Fig. 107. 



either in cages or under the greenhouse bench. The essential 

 is damp earth and a moist shaded place where the water-pores 

 at the leaf-tips will function freely. Examine from time to time 

 to make sure that drops of water remain on the leaf-tips. If nec- 

 essary, wet down the greenhouse thoroughly so as to saturate the 

 air. After 30 hours set on the bench and withhold water for a 

 day, if the soil looks wet. Change the plants frequently to larger 

 pots and transplant into the garden at the end of June (May in 

 the South) when the plants are about 15 inches tall, and make 



