24 BULLETIN 1260, U. S. DEPARTMENT OF AGRICULTURE. 
and Table 1.) At this comparatively low altitude and latitude (34 c> 
N.) practically all the sorghum varieties except the very latest ma- 
ture regularly. Honey and Gooseneck sometimes fail to mature, but 
Sumac is well adapted" to Chillicothe conditions. 
Insect pests do very little damage at Chillicothe. On rare occasions 
the sorghum midge has caused some blighting of the late varieties; 
ordinarily, however, it does not appear at this station in sufficient 
numbers to cause appreciable damage. Chinch bugs are sometimes 
present in considerable numbers but the percentage of injury is small, 
even on susceptible varieties like milo. Green aphids are always 
present, but rarely attack the sorghum while the plants are small 
in sufficient numbers to retard the growth seriously. When the 
plants become large the presence of aphids does not seem to pre- 
vent normal growth. 
Among the diseases which have to be guarded against, kernel smut 
is perhaps of first importance, but it has been easy to hold in check. 
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f SwsBI 
f£M£ 
BBPi^v fifjJBtMJi? 
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few J^sp^uSS 
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Fig. 8.— First crop of feterita at Chillicorhe. Tex. Photographed July 20, 1914. 
Head smut has never given trouble at Chillicothe, but the red-spot 
disease is prevalent every year and in humid seasons causes some 
injury to the foliage. 
The length of growing season, average height of plants, and the 
acre yields of air-dry fodder and threshed seed are given by years in 
Table 4 for each of the sorghum varieties under test at Chillicothe. 
The average row spaces per plant and per stalk are also given. 
In the experiments at Chillicothe. as m those at Hays, the prac- 
tice has been to use the most productive strain of each variety as it< 
representative in the tests. Many varieties not included in the experi- 
ments at Hays were grown at Chillicothe, because of the longer grow- 
ing season at the latter point. 
The stands obtained have, on the whole, been less uniformly good 
than at Hays. These stands are, however, better than will be found 
in the fields of farmers under like conditions. In any study of the 
