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- Author or Editor: R. H. Littrell x
Fungicides, dodine, fentin hydroxide, captafol, and benomyl, gave adequate control of pecan scab caused by Fusicladium effusum Wint., using a 3-week spray schedule beginning April 22 and concluding August 5. Massive applications of dodine and captafol at bud break to replace the first 3 scheduled applications failed to give equivalent control of scab.
Leaf scorch symptoms are described. Control was excellent using any of the fungicides tested. Leaves of checks were severely damaged by scorch. It is suggested that 1 or more fungi are associated with the cause(s) of this malady. Fungicides increased quality by increasing percentage of edible kernel, reducing shuck damage, and increasing wt of nuts.
An Mg-N formulation (RES-20482) used as a 0.25 or 0.50% spray solution or when trunk injected at 5 ml/2.54 cm of trunk circumference did not significantly increase leaf Mg of pecan (Carya illinoensis (Wang.) K. Koch).
Pressure trunk injection of Zn sulfate solutions rapidly increased leaf Zn levels of Zn deficient trees in pecan (Carya illinoensis (Wang.) K. Koch). Injection of 2270 g/tree killed foliage and twig terminals within one week. New foliage growth appeared normal but was high in Zn. Injected Rhodamine B dye indicates that solutions move rapidly to the extremities of the tree. Injected wood preservative “Osmose” killed trees within 10 days.