Postemergence Oxalis Control in Container-grown Nursery Crops1©
C.V. Simpson, C.H. Gilliam, G.R. Wehtje, J.L. Sibley and J.E. Altland
Experiments were conducted to evaluate the tolerance of abelia to over-the-top spray applications of diuron and to quantify the foliar absorption of diuron on oxalis. Rates ≥0.56 kg a.i./ha (0.5 lb a.i./acre) provided excellent (100%) oxalis control regardless of the time of year the treatment was made. Diuron applications ≤1.12 kg a.i./ha (1.0 lb a.i./acre) in fall and spring caused slight to no injury to dormant abelia. Plants leafed out normally in the spring after application and there was no difference in growth 180 days after treatment (DAT). Application at 2.24 kg a.i./ha (2.0 lb a.i./acre) caused slight to no injury on abelia by the following spring. Spring application to actively growing abelia caused slight to moderate injury from which plants treated with ≤0.56 kg a.i./ha completely recovered by 90 DAT. Abelia treated with 1.12 kg a.i./ha (1.0 lb a.i./acre) were slightly injured 90 DAT. Abelia treated with 2.24 kg a.i./ha (2.0 lb a.i./acre) were severely injured with many dead plants 60 DAT. Absorption and translocation of foliar-applied diuron by oxalis was evaluated using radiotracer techniques. After 24 h, 86% of the applied diuron had been absorbed, and 76% of amount applied remained in the treated leaflet, indicating minimal translocation.
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