Resistance of sorghum to stem borers
1936
Hsu, T.S.
1. Grain sorghum is attacked by several species of stem borers, such as Pyrausta nubilalis, Diatraea, etc. 2. Data were obtained from the study of infestation in 1,073 strains and varieties in 1933, indicating that the extent of infestation by stem borers varied with varieties, 3. Further data obtained in 1934 under both field and controlled conditions gave further indication of differences in varietal infestation. 4. Under controlled conditions sorgos as a group were more susceptible to the insect than the nonsaccharine varieties. 5. Host selection of the "laying" moths is a possible cause for the varying degrees of infestation in different varieties of sorghum. 6. The degree of infestation by borers is probably a heritable character as the correlation between 1933 and 1934 infestation was significantly high. 7. Studied by means of X2 for independence, borer infestation was found to be consistently associated with color of grains and height of plants. 8. White grain varieties showed less infestation by borers than varieties with other grain colors. The reason for this relation is unknown.
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