ISHS Acta Horticulturae 177: IV International Symposium on Flower Bulbs
CONTROL OF FIRE (BOTRYTIS TULIPAE) ON TULIPS IN WASHINGTON WITH DICARBOXIMIDE FUNGICIDES |
| Author: | Gary A. Chastagner |
| Abstract:
In field tests conducted since 1977 the dicarboximide fungicides, vinclozolin and iprodione, have provided better control of fire on tulips than benomyl, anilazine and dithiocarbamate fungicides. Disease control was not affected by varying the volume of water used to apply these fungicides (from 233.8 to 935.4 l/ha) nor by increasing the interval between applications (from 14–21 days). Strains of Botrytis tulipae with cross resistance to dicarboximide fungicides and dicloran were obtained by placing conidia from a dicarboximide sensitive isolate on media amended with vinclozolin or iprodione. On potato-dextrose agar, growth rates of resistant strains were about one-half that of sensitive isolates. There was no difference in production of sclerotia. | |
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