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Canker expansion on water stressed pin oaks quercus palustris colonized by endothia gyrosa


, : Canker expansion on water stressed pin oaks quercus palustris colonized by endothia gyrosa. Plant Disease 68(10): 851-853

The effect of moisture stress of predisposition of 5- to 7-yr-old pin oak (Q. palustris) grown in containers to canker induction by E. gyrosa was studied. Inoculated trees were subjected to episodes of drought in the greenhouse. Only stressed trees were colonized by the fungus. Colonization was consistently inhibited in regularly watered trees, and a callous ridge formed around the inoculated wound. During drying of the potting media, resistance to colonization diminished before wilting was evident. Cankers elongated most rapidly 2-8 days after a drying period was terminated by watering. A target pattern in cankers resulted from repeated episodes of drought.

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