Healthy trees grow lots of branches and leaves – their canopy – as thickly as they can, to gather all the sunlight they need. — Dreamstime/TNSClimate change, invasive species and even international trade are taking a serious toll on California trees.
Professional consulting arborists usually charge US$200 to US$400 for a consultation, said Darren Butler, a Los Angeles-based consulting arborist, horticulturist, landscape designer and co-creator of the GardenZeus.com. When you consider how healthy, mature trees boost property values, that’s a relatively small fee to pay, he said, but people often wait until it’s too late to ask for help. Search for trained arborists through the International Society of Arboriculture.
Mineral deficiencies or pollutants such as salt or even dog urine also can cause problems, especially if your dogs have been peeing around the same tree for years, Butler said. Sprinklers that constantly hit tree trunks are another contributing factor, Butler said. People tend to plant lawns around trees, then water everything the same way. That’s detrimental to the trees, which need sporadic deep watering instead of the frequent shallow watering most people give their lawns.
Infected trees send up shoots of bright yellow leaves – the “yellow dragon”, Rolshausen said. Eventually, new leaves get twisted and mottled and the fruit stops ripening, becoming misshapen and bitter, leading to the other name, citrus greening disease.
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