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Scouting Citrus for Pests - Page 28
Given high levels of severe CTV inoculum in most of Florida, it is likely that the 20% of our citrus budded to sour orange rootstock is doomed. However, CTV still presents a danger for citrus on tolerant rootstocks due to so-called stem pitting strains that cause injury regardless of rootstock. These strains are presently rare in Florida but may increase in response to selection pressure from the aphid. Since this selection pressure is a function of the aphid population, biological control could forestall movement of stempitting strains into our groves by decreasing aphid populations. Two ways of increasing biological control are introduction of new species parasitic wasps, and manipulation of habitat to provide refugia and alternate prey for
beneficials when aphids get scarce.
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