FIRST REPORT 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-GROUP 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 correspondent of the Board from South 
Tawton, Devon, from a field that was seriously damaged, were found 
to be attacked by eel-worms ( Tylenchus 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 
surrounded 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-wonn attacks chiefly oats, rye, clover, onions, turnips, but also 
occurs in wheat, buckwheat, and various wild grasses, as sweet- 
