Effect of tree age and various rootstocks of apple on Phytophthora cactorum, The cause of crown and root rot in Malakand division [Pakistan]
1999
Khan, J. (Agricultural Research Station, Swat (Pakistan))
An extensive survey of apple orchards of different ages was conducted to explore the incidence of Phytophthora cactorum. Crown and root rot was observed on trees of all ages, but trees grown on Mailing-Merton and standard (local) rootstocks during the first 3-5 years, when they first come into bearing, were most affected. As the age of the trees increased, severity and incidence of the disease decreased. Different rootstock types of apple were evaluated for their resistance to P. cactorum. Depending on various factors, all the tested rootstocks were found to be susceptible except for M-9. This rootstock, if horticulturally suitable, may provide field resistance to P. cactorum in Malakand Division.
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