Feb. 24 .1923 Early Vigor, Yield, and Rot Diseases of Maize 
589 
and silking and did not yield nearly so much grain as the healthy plants. 
Others, however, grew very slowly and finally succumbed to the attacks 
of the parasitic organisms with which they were infected. 
A summary of these data is given in Table I. It will be observed 
that the diseased transplants never recovered sufficiently from the 
stunting in growth during the first 15 days to produce a normal yield 
of grain. In some cases Sie diseased plants bore a cob of normal length 
but on it there were only a few kernels. 
Fig. 3.—Growth curves and yield of diseased (No. 95) and healthy (No. 96) corn transplants. The greatest 
difference in height and stalk circumference occurred during the interval between 25 and 45 days alter 
planting. After that time the diseased transplant seemed gradually to recover as far as size was con¬ 
cerned. This apparent recovery, however, was of no significance, for it produced only a short ear wnicn 
was badly rotted, whereas the healthy transplant produced a sound ear of normal size. 
Tabi«F I. —Comparative field performance of 34 healthy and 34 diseased transplants of 
Funk Ninety-Day corn grown in clean soil, at Bloomington, III., in iQio 
Condition of seedlings 
when transplanted. 
Points considered. 
Apparently 
disease-free. 
Diseased. 
Number of seedlings: 
Transplanted. 
Dying within 16 days after transplanting 
Living throughout season.. 
Number of transplants producing: 
Two ears. 
One well-developed ear... 
One midsized ear. ...... 
One nubbin only. 
Number of barren plants. 
34 
o 
34 
7 
18 
3 
3 
3 
18 
1 
CORRELATION OF EARLY HEIGHT AND YIELD OF FIELD-GROWN PLANTS 
Table II gives the average heights, average yields, and correlation 
coefficients of height and yield of the plants in two contiguous plots of com. 
4* 4* U* 4. 
