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Buttonwood answer
Remember I was asking about brown patches on buttonwood leaves? Well,
I asked the owner of the bonsai to send me some leaves, because the symptoms did not sound like rust or any of the other things the guy's friends were telling him, and he was needlessly spraying the plant with fungicides. I got the leaves today and looked at them: they were covered with minute mites (that is, really *small* mites, even for mites). Not only that, the mites had four legs pointing forward and four pointing backward, which to me (not an entomologist) spells eriophyid mite. And eriophyid mites cause warty rusty patches on leaves of many hosts (I had a button*bush* (genus cephalanthus)that had red patches on it for years caused by an eriophyid mite). So I did a Google search of "Conocarpus eriophyid" and got the following: "ORNAMENTALS, WOODY PLANTS AND PALMS: Conocarpus erectus var. sericeus (silver buttonwood, a native species)-- Aceria sp., an eriophyid mite: A moderate to severe infestation was found at a restored wetland in Pembroke Pines (Broward County; E2001-4181; Maria S. Quintanilla and Dr. W.C. 'Cal' Welbourn; 10 October 2001). This probably is a new species. It is likely to be responsible for the recent leaf distortion damage observed on buttonwood trees in South Florida. Pruning will temporarily eliminate the damage because most of the mites are in the growing tips; however, in time, populations rebuild and damage re-appears (Dr. W.C. 'Cal' Welbourn)." So that's what I'm sayin'. I'm going to have to tell him to talk to Florida Cooperative Extension on what miticide to use. Nina. |
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