Palm trees are commonly seen in California, making some think about the tree-lined streets of Hollywood, or sitting by the pool somewhere. These tropical or subtropical trees are beautiful and varied, with many different types of palms, each adapted for different growing conditions and each with specific disease-causing pathogens that can attack it.
Palm trees, like other plants, are susceptible to pathogens that can weaken or even kill the tree. Diseases such as diamond scale, pink rot, Fusarium wilt, and others can reduce the leaf canopy, discolor leaves and trunk, and cause distortion, stunting or death.
If you have palm trees or care for palms as part of your work, it's important to identify and know about these...
[From the May 2017 issue of the UC IPM Green Bulletin]
The bronze bug (Thaumastocoris peregrinus) (Fig. 1), a serious and potentially damaging, sap-sucking insect pest of eucalypts, has very recently been detected in southern California. This pest is reported to destroy extensive areas of leaf tissue, often giving it a bronze tint, turning it yellow, red, and then brown to tan. Damage from the bronze bug eventually leads to leaf loss, canopy thinning, branch die back, and even tree death. A wide host range and its ability to survive in a variety of.../span>
[From the August 2016 issue of the UC IPM Green Bulletin]
A new psyllid pest that causes a distinctive, tight, typically complete rolling of leaves (Figure 1), has been found on Ficus microcarpa (Chinese banyan, Indian laurel fig) in Los Angeles, Orange, San Bernardino, Ventura, San Diego, and Riverside counties. This species of Ficus is one of our most common, useful, and widespread ornamental landscape trees. Incidentally, it has also long been a target for numerous exotic pests.
The psyllid, identified as Trioza.../span>
[From the December 2014 issue of the UC IPM Green Bulletin]
Victorian box (Pittosporum undulatum) is an evergreen tree native to Australia that grows moderately fast to about 50 feet high and wide. It was much planted as an ornamental landscape subject in the first half of the 20th century in coastal central and southern California, especially from Santa Barbara to San Diego, where it was used as a lawn or street tree, background, screen, or informal hedge, and prized for its dense canopy, attractive and glossy green foliage, fragrant white flowers,.../span>