XII Journal of Agricultural Research volvi 



Page 

 Plate XLVIII. Contact infection. A part of the new tubers becoming in- 

 •fected with Spondylocladium atrovirens by means of contact with the in- 

 fected mother tuber 350 



Pathological Histology of Strawbermes Affected by Species op Botrytis 



AND Rhizopus 



Plate XLIX. A-H, Strawberry cells attacked by Botrytis sp.: A, Hypha 

 growing partly between and partly within strawberry cells; B, hyphae 

 inside strawberry cells in which remnants of the protoplasm may still be 

 distinguished; C, hypha passing from one cell into another across a short 

 intercellular space; D, E, F, G, H, hyphae entering cells in various ways 

 (in G the hypha has pushed back a portion of the cell wall before breaking 

 through). I-M, Strawberry cells attacked by Rhizopus. sp.: /, Hypha 

 growing between the epidermis and the adjacent layer of storage cells; J, 

 hypha growing over the stu^ace of the strawberry; K, hyphae growing 

 underneath the epidermal layer and between the storage cells; L, Rhizopus 

 sp. growing between epidermal cells; M, germinating spore in cavity 

 formed by a seed ' 366* 



Plate L. Strawberry cells attacked by Rhizopus sp. A, Normal storage cell 

 of strawberry; B, storage cell showing a slight contraction of the proto- 

 plasm; C, D, E, F, G, progressive contraction of protoplasm of host cells 

 near hyphae; H, I, J, strawberry cells near hyphae in which the cell wall 

 has crumpled with the contraction of the protoplasm; K, M, hyphae inside 

 cells; L, hyphae growing between cells of the strawberry; K, L, M are 

 drawn from berries which had been rotted in the desiccator 366 



Life Histories and Methods of Rearing Hessian-Fly Parasites 



Plate LI. Fig. i. — Egg of Eupelmus allynii. Fig. 2. — Egg of Eupelmus 

 allynii in situ. Figs. 3, 4. — Pupa of Eupelmus allynii. Fig. 5. — Egg of 

 Merisus destructor. Fig. 6. — Pupa of Merisus destructor. Fig. 7. — Egg of 

 Micromelus subapterus. Fig. 8. — Pupa of Micromelus subapterus 382 



Plate LIL Fig. i. — Mandibles of full-grown larva of Eupelmus allynii. Fig. 

 2. — Larva of Eupelmtis allynii. Fig. 3. — Mandibles of full-grown larva of 

 Merisus destructor. Fig. 4. — Larva of Merisus destructor. Fig. 5. — Man- 

 dibles of full-grown larva of Micromelus subapterus. Fig. 6. — Larva of 

 Micromelus subapterus 382 



Transmission and Control of Bacterial Wilt of Cucurbits 



Plate LIII. — Two wilted cucumber plants which contracted bacterial wilt at 

 beetle gnawings of the leaves marked x. Three healthy, uninjured plants 

 in same hill are also shown 434 



Plate LIV. — Plots in field i, East Marion, Long Island, N. Y., 1915. Fig. i. — 

 Plot sprayed with Bordeaux mixture and lead arsenate, begiiming June 25. 

 Fig. 2. — Plot sprayed with Bordeaux mixture and lead arsenate, beginning 

 July 19, after most of the stiiped-beetle injury had occurred . Fig. 3 . — Plot 

 sprayed with Bordeaux mixture and lead arsenate, beginning July 27. 

 Fig. 4. — General -view of field, showing cages and meteorological-instrument 

 shelter 434 



Correlated Characters in Maize Breeding 



Plate LV. — Typical plant of the Waxy Chinese variety of maize, showing 

 numerous tassel branches, erect leaf blades, one-sidedness, and curved 

 tassel 454 



