ILLUSTRATIONS 



Fusarium-Blight (Scab) of Wheat and Other Cereals 



Text Figures 



Page 



i. Conidia of Gibberella saubinetii 16 



2. Special culture tube for maintaining moisture in culture 18 



Plates 



i. Gibberella saubinetii: Blighted ("scabbed ") wheat heads 32 



2. Gibberella saubinetii: A. — Footrot of wheat caused by Fusarium. B. — 



Seedling-blight of wheat caused by G. saubinetii 32 



3. A. — Fusarium seedling-blight. B. — Tissue invaded by G. saubinetii in 



causing the headblight of wheat 3 2 



4. Gibberella saubinetii: A. — Kernels blighted and shriveled by Fusarium- 



blight. B. — Perithecia development of G. saubinetii on an infected 

 wheat head 3 2 



Cause op Lime-Induced Chlorosis and Availability of Iron in the Soil 



Plates 



5. A. — Rice grown in calcareous and noncalcareous soils and sprayed with 



ferrous sulphate solution (experiment I). B. — Apparatus used in grow- 

 ing plants in experiment VII 62 



0> a. — Effect of carbonate of lime in depressing the availability of iron (experi- 

 ment VII). B. — Effect of various substances on growth of rice in cal- 

 careous soil (experiment VIII) 62 



A New Avocado Weevil from the Canal Zone 

 Plates 



7. Heilipus perseae: A, B.— Adult, paratype. C. — An avocado fruit (re- 



duced) showing feeding injury by the beetles 116 



8. Heilipus perseae: Leaves showing the injury done by five beetles in 48 



hours "6 



9. Heilipus perseae, mature larva: A. — Ventral face of ventral mouthparts. 



B. — Anterior part of head from above. C. — Lingua, hypopharynx, 

 hypopharyngeal bracon, and dorsal (buccal) face of maxilla. D. — Dor- 

 sal face of mandible. E. — Epipharynx. F. — Ventral face of mandible. 

 G.— Head capsule from above. H. — Thoracic spiracle from outside. 

 I. — Mature larva "6 



Studies in Mustard Seeds and Substitutes: I. Chinese Colza (Bras- 



SICA CAMPESTRIS CHINOLED7ERA VlEHOEVER) 



Plates 



IOi a. — Yellow seed of Chinese colza. B. — Brown seed of Chinese colza. 

 C. — Surface section of yellow seed of Chinese colza, showing lack of retic- 

 ulations. D. — Surface section of brown seed of Chinese colza, showing 

 reticulations. E. — Cross section of yellow seed of Chinese colza. 

 F. — Cross section of brown seed of Chinese colza 140 



(VH) 



