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Epidemiology and chemical control of godronia cassandrae fusicoccum canker of highbush blueberry


, : Epidemiology and chemical control of godronia cassandrae fusicoccum canker of highbush blueberry. Phytopathology 67(12): 1475-1480

A Burkard volumetric spore trap in continuous operation for 2 seasons in a highbush blueberry [Vaccinium corymbosum] field heavily infected by G. cassandrae captured only negligible numbers of airborne conidia and ascospores of the pathogen. Rain-dispersed conidia were trapped by means of funnels attached beneath cankers and attached via tubing to jugs for collection. Conidia were most abundant May through mid-June (blossom bud swell to petal fall). The number of conidia trapped ranged up to 1.21 .times. 105 conidia/ml of trapped rain water. Conidia were fewer in number June-Sept. and Oct. (late leaf fall) than during April and May. The frequency of natural field infection was greatest during late April-June. Potted bushes inoculated with conidia also had the highest numbers of infections resulting from the April-June inoculation dates. Wounding was not required for infection since nonwounded inoculated plants consistently were infected during the growing season. Bushes exposed to ascospore inocula failed to become infected. In vitro germination of conidia was favored by temperatures of 22 and 30.degree. C. Mycelial growth and infection of blueberry bushes was favored by temperatures of 10-22.degree. C. In fungicide field plot evaluations, captafol (Difolatan) significantly reduced the numbers of cankers at 1 location by 82-95% [LSD (P = 0.01) = 0.12] and at another location by 52-65% [LSD (P = 0.01) = 0.21].

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