62 
T . W . WOOD & SONS 
RICHMOND, VIRGINIA 
SEEDSMEN SINCE 1879 
« 
Over 3,500,000 Acres in Hybrid Corn 
Grown in U.S. in 1937 
The reasons for this phenomenal increase within such a short period are: 
INCREASED YIELD OF 15% TO 25% —Experiment station tests show actual yield increases 
of 15% to 25% over the best commercial varieties. 
DROUGHT AND WIND RESISTANCE —From % to % deeper and more vigorous root systems 
are found in all of our Hybrids. 
INCREASED STALK STRENGTH —This, combined with the deeper root growth, results in 
a corn which does not lodge and will not blow down. 
DISEASE RESISTANCE —Resistance to smut, rust, and wilt in our Hybrids eliminates weak, 
diseased stalks and diseased, unsound ears. 
GREATER UNIFORMITY —Practical elimination of barren stalks and nubbins. Uniform 
maturity. 
WHAT IS HYBRID CORN? 
The term “hybrid” does not refer to a cross of different varieties of corn, but to a cross 
between inbred lines or combinations of such lines. These inbred lines tend to perform the 
same way under like conditions, making it possible to predict their performance year after 
year. Commercial hybrids are double crosses made up by combining four different inbred 
strains 
DEVELOPMENT OF INBRED LINES 
An inbred line is produced by placing the pollen from a plant on the silks of the same 
plant and excluding all other pollen. Self-fertilization in corn results in a marked decrease 
in vigor and productivity. After about five years of inbreeding a certain level is reached,, after 
which the plants may be expected to be nearly uniform in growth and performance. They are 
“pure” lines, and if they contain desirable characteristics, are crossed with other inbred lines 
for the production of hybrids. These inbred lines are subjected to many tests to determine 
their desirability in hybrid combinations. They must carry the necessary qualities to trans¬ 
mit increased yield, disease resistance, ear type, etc. 5 to 10 years of inbreeding, selecting 
and testing are required before desirable inbred lines and their hybrid combinations are ready 
for commercial production. 
PRODUCTION OF HYBRIDS 
Production of a double cross hybrid corn is not a simple program of multiplication. The 
four inbred lines must be maintained year after year by hand pollination. Each year two of 
the inbred lines must be crossed to form a single cross and the other two crossed in a differ¬ 
ent field. The second year two single crosses are combined to form a double cross by planting 
the paired combinations in isolated fields, one row of the pollen parent to three of the seed 
parent. The plants in the seed rows are detasseled before they shed any pollen. The ears 
from the detasseled rows furnish the hybrid seed which will increase your yield and give you all the other advantages of hybrid corn. 
Because seed saved from a field planted with hybrid corn loses its hybrid vigor after the first year, new hybrid seed must be obtained 
each year. 
Our hybrid corn expert hand polli¬ 
nating corn to produce inbred lines. 
A double-cross production field of Wood’s Hybrid 
Yellow Dent after detasseling. Note the 
uniformity and strength of stalk. 
We Offer Hybrids Adapted to Every Section 
In our growing stations from Northern Ohio to Southern North Carolina, we I 
are producing both yellow and white hybrids adapted to every section east of » 
the Mississippi that have proved superior to the best local varieties by state j 
tests. 
Certified Yellow Corn Belt Hybrids 
We grew In Ohio under rigid supervision and certification of the Ohio Crop 
Improvement Association 6 hybrids which have stood at the top in yield tests. 
throughout the corn belt. They are listed below according to days to maturity. 
IOWA 951—99 days. Earliest maturing corn belt hybrid. Adapted to extremely 
high altitudes and the section just north of the corn belt with very short sea¬ 
sons, including Northeastern Ohio and Central Michigan. Long ear. Blunt, thick 
short grain. Medium dent. Medium short stalk. Good root system. 
IOWA 939—103 days. Same maturity as Woodburn Yellow and same wide adapta¬ 
tion from Northwestern Ohio and Southern Michigan on across northern part 
of corn belt. Medium length ears. Shallow, medium thick grain. Very leafy,, 
short, stocky stalk. Ears placed low on the stalk and stand erect all winter. 
Deep roots. Storm and drought resistant. 
II 1 I 1 INOIS 172 —'106 days. Slightly later than Woodburn. Adapted to Central 
Ohio, Indiana and Illinois. Medium tall. Long ears. Medium deep kernel. Me¬ 
dium smooth dent. Strong stalk with deep root system. 
U. S. 52 (OHIO C-72) —109 days. A hybrid involving Southern Ohio Clarage with 
same maturity and adaptation, including southern half of corn belt. Medium 
tall. Most lodge-resistant corn ever tested. Medium size ears. Medium dent.. 
Hard, sound grain. Light yellow color. Ears resemble Clarage, but deeper grain. 
Extremely heavy yield. Very deep roots. 
INDIANA 614 —110 days. Slightly later, but about same adaptation as late Ohio> 
Clarage in southern half of corn belt. Medium tall, leafy stalk. 
OHIO I*-31 —113 days. A hybrid developed in Ohio involving Lancaster Surecrop, 
with same maturity and adaptation; from the Ohio River Valley as far north as 
Columbus, Ohio. It made remarkably high yields in 
West Virginia and Falmouth, Ky. Experiment Station 
tests. Beautiful show type ears, 11 inches long. 15 
rows of deep grain. Medium dent. Medium tall. Good 
strength of stalk and roots. 
PRICES OF Alili CERTIFIED CORN BELT HYBRIDS 
Treated with Semesan Jr.—Hand-Tipped and Butted. 
By mail postpaid, qt. 50c; y 2 peck $1.30; peck $2.35; y 2 bushel $4.35; bushel $8.30. 
Not postpaid, y 2 peck $1.05; peck $1.95; y 2 bushel $3.65; bushel $7.00; 5-bushel lots 
$6.85 per bushel. 
Round tip and butt grains $1.00 per bushel less (sold only in lots of one bushel 
or more). 
Protect Your Corn Plantings 
r* with 
STANLEY’S CROW REPELLENT 
