South American Palm Weevil Treatment by SavATree Insects & Diseases The South American palm weevil (Rhynchophorus palmarum) is one of the most serious threats to palm trees in California. These invasive beetles can irreparably damage a healthy palm in just a matter of months. How? Palm weevils and their larvae destroy the growing tissue within palms, leading to decline and eventual death without proper intervention. Taking a proactive approach to managing these pests is key. Palm trees can be a considerable monetary investment (often upwards of $20,000), not to mention valued additions to your property. Once a palm is symptomatic, it may be too far gone to salvage. Backed by science-based research, SavATree is uniquely qualified to provide year-round protection for your palms. What Are South American Palm Weevils? Originally endemic to South America, the South American palm weevil (SAPW) has since expanded its range and made its way north. The insects were first detected in California in 2011 near the US/Mexico border. They’re now active throughout San Diego County. These imposing black beetles are present year-round and typically live up to three months. During their lifetimes, they can create a host of problems. They proliferate fast, with females laying between 50-550 eggs that hatch in one to six days and go on to reproduce quickly. They also have a strong flying ability. In fact, palm weevils are capable of traveling several miles in search of host trees and more than 100 miles over the course of their lives. They show a particular preference for Canary Island date palms (Phoenix canariensis)—and that preference has proven devastating to thousands across San Diego County. But that doesn’t mean other palm species are safe. SAPW also attacks coconut, sago, fan, and royal palms. Their rapid spread and detrimental impact make them one of the most concerning invasive species to palm trees in California. Signs of a South American Palm Weevil Infestation When it comes to pests as insidious as SAPW, early detection may not be enough. It’s essential to be proactive. If you own palm trees and live in areas with high infestation rates, you’ll want to ensure your palms are being professionally monitored. This can mean the difference between saving and losing them. If you spot these signs, it means your palms have likely already fallen prey: Crown flattening: Sudden wilting of the newest fronds in the palm’s crown. Crown yellowing: Yellowing, indicating damage, may appear around the crown. Tunneling damage: Large entry holes and tunnels in the crown or trunk of the palm. Frond notching: You may notice notching (jagged or irregular edges) in frond leaves. What Causes a South American Palm Weevil Infestation? Infestation begins when female weevils detect the chemical signals emitted by vulnerable palms. These beetles are instinctively drawn to palms experiencing stress. Female weevils then bore into the crown or upper trunk tissue and deposit eggs. Palms already compromised by drought, improper maintenance, or existing pest problems make attractive targets, becoming ground zero for infestations that can then spread to healthy trees. How Do They Harm Your Palms? Adult weevils cause initial damage by boring into the crown or trunk to feed and lay eggs. The most destructive stage, however, is the larval phase. The large, grub-like larvae tunnel through the heart of the palm (where it grows) and feed on the growing tissue. This feeding destroys the palm's vascular system and growing point, preventing new frond development. How to Spot South American Palm Weevils Identifying SAPW is key for early detection. They’re black with a velvety texture, and they’re large. Adults measure around 1.5 inches long and have a distinctive curved snout (rostrum). Males have bristly hairs resembling a beard on the rostrum. Larvae are cream-colored with reddish-brown heads. They’re typically found deep within the crown or trunk tissue of infested palms. Where to Find South American Palm Weevil Treatment Near You SAPW is difficult to control once infestation occurs, but if detected early, SavATree's professionals can help intervene with specialized treatments. But the best treatment plan happens well before infestation. Palms don’t have the ability to defend themselves against the effects of SAPW. If you own Canary Island palms, it’s critical you seek preventive care. If your palm is too compromised by infestation, SavATree’s certified arborists can safely remove it while treating nearby trees that aren’t symptomatic—helping preserve and nurture your remaining palms. SavATree professionals are trained to identify early signs of infestation and implement customized treatment plans for your specific landscape needs. SAPW is just one of many threats to trees. We provide comprehensive pest management to protect against all types of infestations. Types of Palm Weevils SAPW belongs to a family of palm weevils that can cause similar damage: Red Palm Weevil (Rhynchophorus ferrugineus): A related species with reddish coloration. Giant Palm Weevil (Rhynchophorus cruentatus): A native species found in the southeastern United States. All of these species require professional treatment approaches. How to Prevent South American Palm Weevil Infestation Prevention is the best strategy against SAPW. Regular monitoring of palm trees, especially after pruning or during periods of stress (like drought), is crucial. SavATree offers preventive programs that protect your palms from infestation. Our approach includes scheduled inspections, proper fertilization to maintain palm health, and treatments that deter attack. Taking preventive measures is especially important for palms. They’re significant landscape investments that can take decades to mature. By implementing SavATree's care program, you can help them thrive and preserve the look of your landscape. Contact us today to schedule a consultation with an expert arborist.