VI Journal of Agricultural Research voi. xiir 



Soil Fungi in Relation to Diseases op the Irish Potato in Southern 



Idaho „ 



Page 

 Plate A. 1-4. — Fusarium nigrum, n. sp.: i, Culture 32 days old on steamed 

 Irish potato plug. 2, Culture 40 days old on string-bean agar. 3, Culture 

 21 days old on steamed rice. 4. Culture 31 days old on Irish potato agar, 

 plus 10 per cent of glucose. 5-6. — Fusarium elegantum, n. sp.: 5, Culture 

 25 days old on steamed rice. 6, Culture 18 days old on steamed-potato 

 plug. 7-8. — Fusarium lanceolatum, u. sp.: 7, Culture 20 days old on 



steamed-potato plug. 8, Culture 18 days old on steamed rice 100 



Plate B. 1-3. — Fusarium aridum, n. sp.: i, Culture 40 days old on string- 

 bean agar. 2, Culture 31 days old on steamed-potato plug. 3, Culture 

 17 days old on steamed rice. 4-6. — Fusarium idahoanum,n.sp.: 4, Culture 

 41 days old on Irish potato agar with 10 per cent of glucose added. 5, 

 Culture 20 days old on steamed-potato plug. 6, Culture 21 days old on 

 steamed rice 100 



Effect of Temperature and Other Meteorological Factors on the 

 Growth op Sorghums. 



Plate h. A typical plant of Blackhvdl kafir grown at Chillicothe, Tex 148 



Plate 12. A typical plant of Dwarf milo grown at Chillicothe, Tex 148 



Overwintering of the House Fly 



Plate 13. Musca domestica: A-F. — Various stages in the development of the 

 ovarioles from the time of emergence of the fly until after deposition of eggs. 

 G. — Two spermathecse 170 



Leafblight op Kalmia Latifolia 



Plate 14. A.— Twig of Kalmia latifolia showing late stage of infection with 

 Phomopsis kalmiae. B. — A leaf of K. latifolia in an incipient stage of infec- 

 tion. C. — Plant of K. latifolia showing the intermediate stage of the disease . 212 



Plate 15. A.— Aleaf of Kalmia latifolia enlarged 13 times to show the character 

 of the pycnidia of the fungus on its host. B. — A stem of Kalmia latifolia 40 

 days after inoculation in leaves only. C— Photomicrograph showing both 

 kinds of spores of Phomopsis kalmiae, from culture on com meal. D. — Sec- 

 tion through a pycnidium of Phomopsis kalmiae on leaf of K. latifolia. E. — 

 The ordinary type of spore of Phomopsis kalmiae more highly magnified 212 



Plate 16. Phomopsis kalmiae: A.— An i8-day-old culture on steamed com 

 meal enlarged about 5 times. B.— A 15-day-old culture on same medium. 

 C. — Portion of corn-meal agar plate on which were sown three bisected 

 sterile pycnidia. D. — Section through a pycnidium, showing the sporo- 

 phores and the nucleated hyphse just below them. E.— A portion of same 

 section shown in figure A more highly magnified 212 



Plate 17. Phomopsis kalmiae: A.— Section through a sterile pycnidium, 

 show'ng an area containing nucleated hyphse. B. — Central portion of 

 figure I more highly magnified. C. — Section through a sterile pycnidium, 

 showing growth beginning at the margins after it had been transferred to a 

 more suitable medium 212 



Intumescences, with a Note on Mechanical Injury as a Cause of Their 



Development 



Plate 18. A.— Intumescence on cabbage formed as a result of injury from 

 wind-blown sand. B .—Intumescences produced following injury from sand 

 artificially projected against the leaves of cabbage 260 



