| Popis: |
SummaryNew clonal cherry rootstocks selected at East Mailing Research Station were assessed for resistance to bacterial canker. Resistance was not stable at the seedling stage, and trees should be assessed when not less than three years old. Variation in soil conditions markedly affected the response of the rootstock. When a new race of P. morsprunorum was included in the tests many rootstocks were equally resistant to both this and the typical race, but a few hybrid rootstocks had very low resistance to the former. Plum trials under more uniform conditions gave less variable results, but seasonal and other factors induced some variation between inoculations of one year and another, and between inoculations and natural infections. |
