DISEASES OF TRUCK CROPS. 41 



OKRA. 



Root-knot (Heterodera radieicola (Greef) MoL). — This disease is 

 common on okra (Aoelmoschus escidentus Moench.) , but was observed 

 to be the cause of serious loss only in an irrigated garden. 



Specimens collected : San Antonio, 1394 ; Llano. 1770 ; Stockdale, 2631 ; 

 Yoakum, 2768. 



Root-rot (Ozonium omnivorum Shear). — Observed in a single 

 localitj 7 where the plants were stunted and chlorotic. 

 Specimens collected : New Braunfels, 1711, 1712. 



Root-rot {Rhizoctonia sp.). — This fungus caused the destruction 

 of the smaller roots and the constriction of the stem at the ground 

 level. 



Specimen collected: San Antonio, 1330. 



PARSLEY. 



Root-knot (Heterodera radieicola (Greef) Mill.). — This trouble 

 was observed on parsley (Petroselinum sativum Hoffm.) in a single 

 locality. 



Specimen collected: San Antonio, 3144. 



Root-rot (Ozonium omnivorum Shear). — This diseased condition 

 is characterized by the same symptomatology as when this fungus is 

 present on other herbaceous hosts. 



Specimen collected : San Antonio, 3143. 



PARSNIP. 



Rhizoctonia root-rot (Corticium vagum B. and C. var. solani 

 Burt). — The white strands of fungous filaments surround the roots 

 of the parsnip (Pastinaca sativa L.), but do not cause any material 

 loss. 



Specimen collected : San Antonio. 



PEA. 



Powdery mildew (Erysiphe polygoni DC). — This fungus forms a 

 white coating on the leaves and pods of the pea (Pisum sativum L.), 

 causing them to become brown and dry. It is probably quite com- 

 mon throughout the territory. 



Specimen collected: Austin, 3130. 



PEPPER. 



Anthracnose (Collet otrichum nigrum Ell. and Hals.). — The fruit 

 of the pepper (Capsicum annuum L.) sometimes shows large, brown, 

 sunken areas. The black acervuli are either scattered over the dis- 

 eased spot or zonately arranged. 



Specimen collected: Uvalde, 1951. 



226 



