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Avocado root rot. We talk about it, we pay for research to control it, we invest in clonal rootstocks to avoid it, but are we doing our best to prevent it? I pose the question, because recently I was called out to inspect a grove I had seen a year before where I was sure the disease was rampant.
Definitions: Dry-bulb temperature: the temperature of the air as measured with a thermometer. Wet-bulb temperature: the temperature that the tree will likely sense due to evaporative cooling of the leaves. Dew point temperature: the air temperature required for condensation (dew or frost) to occur.
Many chemicals and some bacteria have been tested to induce frost tolerance of citrus, avocado and other horticultural crops. In some trials, protection of a few degrees has been achieved, but more commonly, the results have been variable or not commercially successful.
How Frosts and Freezes Occur Before considering the methods of frost protection, one should understand the conditions under which low temperatures occur. To differentiate between the two major sources of the cold, the terms local radiation frost and freeze are used.
The oldest analysis terminology is weight per weight; e.g. 55 weights of calcium per weight of soil, standardized on a million weight of soil, tissue or water or parts per million (ppm).
