VI Journal of Agricultural Research voi. x 



A COLLETOTRICHUM LEAFSPOT OF TuRNIPS 



Page 



Plate 13. A.— Leaves of a turnip nine days after inoculation with conidia of 

 Collctoirkhum brassicae. B.— A ttunip leaf showing spots produced by 

 Cylindrosporium brassicae 162 



Plate 14. Colletolrkhu^n brassicae iromturmv): A.— Section through an acervu- 



lus on a tiunip leaf. B. — Conidia from a turnip leaf 162 



Black Rootrot op the Apple 



Plate i";. A. — A healthy 6-year-old apple tree contiguous to the affected tree 

 sho\\'n in figure B, which appears in the background. B. — A 6-year-old 

 apple tree shoAving pronounced symptoms of rootrot in the thinness of the 

 foliage and inclination of the trunk. C. — Xylaria polymorpha fruiting on 

 large lateral root of a 7-year-old apple tree. D. — Xylaria hypoxylon devel- 

 oping stromata on an apple root after three months in a moist chamber. 

 E. — Terminal gro\%i;hs of trees shown in figures A and B, showing effect of 

 rootrot on annual increase in length: a, branch from the tree affected by 

 rootrot; b, branch from the healthy tree 174 



Plate 16. A. — A longitudinal section of a living apple root inoculated at X 

 with mycelium of .Y. hypoxylon showing discoloration of wood and bark, 

 after six weeks in a moist chamber. B. — Surface view of a living apple 

 limb inoculated with X. hypoxylon after five weeks in moist chamber. 

 C. — Black encrustation produced on an apple limb inoculated with X. 

 hypoxylon in a moist chamber. D. — An 8-day old colony of X. 

 hypoxylon on starch agar showing characteristic zonation and lobed 

 margin. E. — A longitudinal section of a living apple root inoculated 

 with Sphaeropsis malorum, after four weeks in a moist chamber. F. — A 

 surface view of a living apple root inoculated with mycelium of X. 

 hypoxylon, after four weeks in moist chamber 174 



Plate 17. A. — Xylaria hypoxylon fruiting at the base of a dead apple tree. 

 B. — Stumps of young apple trees which have died from rootrot after hav- 

 ing been planted where old trees had died from the same cause. C. — 

 Black rootrot lesions on an apple root from Cloverdale, Va. D. — Longi- 

 tudinal section of a stroma of X. polymorpha, showing perithecia embedded 

 in the periphery. E. — Conidial stromata of X. hypoxylon in petri-dish 

 cultiu-e on Czapec agar. F. — Mature stromata of A', hypoxylon from stump 

 shown in figure A, producing ascospores after one month in a moist chamber. 174 



Physiological Effect on Growth and Reproduction of Rations 

 Balanced from Restricted Sources 



Plate 18. Cattle showing the effect of a ration of wheat grain and wheat straw: 

 A. — Condition at the initiation of the experiment. B. — Condition after 

 12 months on the ration. Note the sluggish and sleepy condition. C. — 

 Condition after 12 months on the ration. Note the distinct emaciation. 

 D. — Condition of two yearlings after 18 months on the ration. Both are 

 in sluggish condition and one of them is blind 198 



Plate 19. Cattle showing the effect of a ration of com grain and com stover: 

 A. — Condition at the initiation of the experiment. B,C, D. — Condition 

 after 12 nionthson the ration. Note the alert and thrifty condition. E. — 

 Condition after 30 months on the ration. Note the splendid condition. . . . 198 



Plate 20. Cattle showing the effect of a ration of com grain and wheat straw: 

 A. — Condition at the initiation of the experiment. B. — Condition after 

 12 months on the ration. C. — Condition after 30 months on the ration 198 



