Browsing by Author "RAULD, E"

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    FACTORS AFFECTING RELEASE OF ASCOSPORES BY THE PEAR SCAB FUNGUS (VENTURIA-PIRINA)
    (1985) LATORRE, BA; YANEZ, P; RAULD, E
    Ascospores of V. pirina were monitored under field conditions [Chile] in 1982 and 1983 with a Burkard 7-day recording spore trap adjusted to sample about 8 m3 of air/h at 55 cm above the ground. Ascospore productivity was determined weekly by sampling partially decomposed pear leaves near the spore trap. Ascospore emissions occurred mainly during daylight hours and fluctuated daily and seasonally (associated with period of free moisture). The first mature ascospores were found when pear trees were in the green tip stage of fruit bud development (late Aug. and early Sept.). Maximum ascospore catches were recorded in Sept. (white cluster to full bloom stage of fruit bud development), then progressively decreased until Dec. The lack of later liberation under Chilean conditions is apparently due to the absence of free moisture periods.