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Pakistan Journal of Biological Sciences
  Year: 1999 | Volume: 2 | Issue: 4 | Page No.: 1338-1340
DOI: 10.3923/pjbs.1999.1338.1340
 
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Effect of Tree Age and Various Rootstocks of Apple on Phytophthora cactorum, The Cause of Crown and Root Rot in Malakand Division

Jahangir Khan

Abstract:
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 Malling-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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How to cite this article:

Jahangir Khan , 1999. Effect of Tree Age and Various Rootstocks of Apple on Phytophthora cactorum, The Cause of Crown and Root Rot in Malakand Division. Pakistan Journal of Biological Sciences, 2: 1338-1340.

DOI: 10.3923/pjbs.1999.1338.1340

URL: https://scialert.net/abstract/?doi=pjbs.1999.1338.1340

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