Control of Avocado Root Rot by Trunk Injection with Phosethyl-Al

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Abstract
Excellent control of Phytophthora root rot was achieved on fully grown avocado trees by injecting phosethyl-Al twice a year at a rate of 0.4 g.a.i.[active ingredient]/m2 of canopy area. The treatment resulted in a significant reduction of Phytophthora cinnamomi incidence in the feeder roots. An increase in the Al content of the treated trees was observed. A negligible amount of phytotoxicity occurred on the foliage of some phosethyl-Al-injected trees. Metalaxyl injected at 0.028 g.a.i. and pyroxyfur at 0.4 g.a.i./m2 of canopy area failed to control the disease.