The pathogenicity of several Pythium species to rootlets of apple seedlings
โ Scribed by D. Mulder
- Publisher
- Springer Netherlands
- Year
- 1969
- Tongue
- English
- Weight
- 216 KB
- Volume
- 75
- Category
- Article
- ISSN
- 1573-8469
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Several thousand apple and pear seedlings of many progenies were studied in connection with their juvenile period (J.P.). The initially significant inverse relation between the vigour (stem diameter) and the J.P. of the seedlings became insignificant as the trees grew older, due to a retardation of
Analysis of two incomplete half-diallel schemes of crosses, involving 22 apple and 33 pear progenies with 2500 and 5400 seedlings respectively, showed a highly significant GCA and an insignificant SCA variance for the juvenile period (J.P.). This indicates that the inheritance of the J.P. is of an a