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The saguaro cactus is an iconic symbol of the American Southwest. However, these majestic succulents are not invincible, and like any living organism, they can develop health problems. One such problem is necrosis, a bacterial condition that can cause irreversible damage and lead to death if untreated. If you suspect that your saguaro has necrosis, you’ll want to contact a professional to inspect it. At Tree Experts, our local arborists are experts at identifying necrosis in saguaros. Then, we can determine the best course of action to address the situation. Here are four symptoms of necrosis in saguaro cactus.
In many cases, an early indication of necrosis in saguaro cacti is the appearance of abnormal discoloration and lesions on the surface of the plant. Healthy saguaros boast a vibrant green hue, but necrotic areas may exhibit a range of colors, including brown, purplish, or even black. Lesions, which can resemble sunken or raised patches, are often a sign of tissue damage and decay.
Necrosis can lead to the dehydration and collapse of plant tissues, resulting in a sunken or shriveled appearance. This is particularly noticeable in saguaro cacti, as their characteristic ribs may become less pronounced. Ultimately, the cactus may lose its structural integrity and begin to sag.
With necrosis, the saguaro's arms may exhibit noticeable drooping or even break off entirely. The structural integrity of the cactus becomes compromised as the necrotic tissues can no longer support the weight of the arms. A saguaro with drooping or broken arms is a sign that immediate action is required to mitigate the spread of necrosis and hopefully salvage the remaining healthy portions of the plant.
Advanced stages of necrosis may lead to the formation of cavities within the saguaro cactus. These cavities are the result of the decomposition of internal tissues, leaving voids within the plant's structure. The presence of cavities weakens the cactus, making it more susceptible to physical damage and collapse. If you notice unusual depressions or hollow areas on your saguaro, it is a red flag signaling the severity of necrosis.
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