ISHS Acta Horticulturae 338: VI International Workshop on Fireblight
EFFECTS OF POSTHARVEST AND BLOOM APPLICATIONS OF PHOSETYLAL ON FIRE BLIGHT AND FRUIT QUALITY IN 'BARTLETT' PEAR |
| Authors: | D. Sugar, K.B. Johnson, S.E. Lindow, V.O. Stockwell |
| Abstract:
Applications of phosetyl-Al to 'Bartlett' pear trees in Oregon during bloom reduced the percentage of infected flower clusters significantly when the inoculum concentration was 105 cfu/ml. Control was less effective when the inoculum concentration was 107 cfu/ml. E. amylovora was recovered from 32% of untreated blossoms but from only 10% of treated blossoms. Postharvest foliar sprays reduced recovery of E. amylovora from blossoms the following spring but did not reduce fire blight incidence. In California, under natural inoculation with low levels of infection in control trees, phosetyl-Al treatments had fewer infections but differences were not significant. No phytotoxicity was observed in Oregon, but California treatments were associated with increased fruit russet. | |
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