FIRST EEPORT ON ECONOMIC ZOOLOGY. 



GROUP E. 



Animals which concern Man by causing bodily injury or 

 disease, both possibly of a deadly character, to (A) his 

 stock of Domesticated Animals, (B) his Vegetable Planta- 

 tions, or (C) to Wild Animals in the preservation of which 

 he is interested, or (D) Wild Plants in the preservation 

 of which he is interested. 



SUB-GEOUP B. ANIMALS WHICH CAUSE INJURY AND 

 DISEASE TO MAN'S VEGETABLE PLANTATIONS. 



Section I. 

 Animals Injurious to Agriculture. 



CEREAL PESTS. 

 Eel-worm Disease in Oats. 



Some oat plants, sent by a coiTesponclent of the Board from South 

 Tawton, Devon, from a field that was seriously damaged,were found 

 to be attacked by eel- worms {Tylcnchus devastatrix, Kuhn). The 

 popular names for the disease these eel-worms cause are " tulip-root " 

 and "segging." This disease takes its name from the swollen 

 appearance of the base of the stem. This swollen basal part is 

 suiTOunded in most cases with contorted shoots of a pale unhealthy 

 hue. The minute eel-worms are found in abundance amongst the 

 deformed shoots and in the stem (at its base). This species of 

 eel-worm attacks chiefly oats, rye, clover, onions, turnips, but also 

 occurs in wheat, buckwheat, and various wild grasses, as sweet- 



B 2 



