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leaves. The mycelium spreads rapidly and may soon cover both leaf surfaces. Haustoria penetrate the cells of leaf tissue and the fungus produces abundant spores (conidia) that are readily disseminated by wind. The disease is fa vored by warm, dry climate, with temperatures ranging from It usually attacks the older leaves spreading to newer leaves as they mature. The disease has been fairly well controlled with timely applications of sulfur, preferably dusting sulfur at rates of 30 to 40 pounds per acre applied at first signs of the disease and repeated as necessary. Restrictions may be imposed on ap plications of dusting sulfur because the dust formulation can be explosive, an irritant to people, and can cause in jury to crops growing in nearby fields. Systemic fungicides, including Bayleton®(triadimefon), have been tested by University of California researchers |
