Effect of N, P, and K on the incidence of fusiform rust galls on greenhouse-grown seedlings of Slash Pine

Schmidt, R.A.; Foxe, M.J.; Hollis, C.A.; Smith, W.H.

Phytopathology 62(7): 788


ISSN/ISBN: 0031-949X
Accession: 000067391

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Seedlings of Pinus elliottii var. elliottii aged 3 or 6 weeks, in pots of fine sand, were fertilized and 2 weeks later were inoculated with basidiospores of Cronartium fusiforme by foliar deposition or stem injection. Results of experiments repeated in different years support the hypothesis that increased rust incidence is associated with increased host vigour. Increased P concentrations caused greater increases in rust than in height growth. An interaction was found between inoculation technique and fertilizing. In contrast to the results of field trials, N depressed growth. [Cf. FA 33, 2821].