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Posts Tagged: beetle
The Secret Life of a Blister Beetle
Blister beetles (family Meloidae) are so named because they emit a poisonous chemical, cantharidin, that can blister your skin. Don't even think about touching them! Blister beetles can infest alfalfa hay, and are toxic--even deadly--to livestock. See "Blister Beetles"...
A blister beetle (family Meloidae) eating pollen from the Mexican sunflower, Tithonia rotundifola. (Photo by Kathy Keatley Garvey)
Applause for the Pollinators
Bees, butterflies, beetles, birds and bats. What do they have in common? Skipping the alliteration for a moment, they're all pollinators. Honey bees grab the most attention, of course, and they do the bulk of the work. But so do bumble bees and other native bees. But other pollinators include...
A Western tiger swallowtail, Papilio rutulus, touches down on a Mexican sunflower, Tithonia rotundifola. (Photo by Kathy Keatley Garvey)
The soldier beetle (family Cantharida) is also a pollinator. This insect resembles the uniforms of the British soldiers of the American Revolution. (Photo by Kathy Keatley Garvey)
A honey bee, Apis mellifera, and a Western yellowjacket, Vespula penslvanica, sharing a rose. Both are pollinators. (Photo by Kathy Keatley Garvey)
A honey bee, Apis mellifera, and a bumble bee, Bombus vosnesenskii, sharing a purple cone flower, Echinacea purpurea. (Photo by Kathy Keatley Garvey)
The Intensity of a Territorial Bee Targeting a Blister Beetle
If you're feeling overwhelmed during the holiday season and just can't seem to concentrate, check out the focus and intensity of this male territorial bee, a Melissodes agilis. It was back in July of 2015 when I spotted a meloid beetle on a Mexican sunflower, Tithonia rotundifola,...
A male Melissodes agilis targeting a meloid beetle on a Tithonia in a Vacaville garden. (Photo by Kathy Keatley Garvey)
The blister beetle eating pollen. (Photo by Kathy Keatley Garvey)
New pest infesting almonds and pistachios in the San Joaquin Valley
Crop sanitation will be key to controlling the invasive carpophilus beetle
Growers and pest control advisers (PCAs) should be on the lookout for a new pest called carpophilus beetle (Carpophilus truncatus). This pest was recently found infesting almonds and pistachios in the San Joaquin Valley, and is recognized as one of the top two pests of almond production in Australia. Damage occurs when adults and larvae feed directly on the kernel, causing reductions in both yield and quality.
Populations of carpophilus beetle were first detected in September in almond and pistachio orchards by University of California Cooperative Extension Specialist Houston Wilson of UC Riverside's Department of Entomology. Pest identification was subsequently confirmed by the California Department of Food and Agriculture.
Wilson is now working with Jhalendra Rijal, UC integrated pest management advisor, North San Joaquin Valley; David Haviland, UCCE farm advisor, Kern County; and other UCCE farm advisors to conduct a broader survey of orchards throughout the San Joaquin Valley to determine the extent of the outbreak.
To date, almond or pistachio orchards infested by carpophilus beetle have been confirmed in Stanislaus, Merced, Madera and Kings counties, suggesting that the establishment of this new pest is already widespread. In fact, some specimens from Merced County were from collections that were made in 2022, suggesting that the pest has been present in the San Joaquin Valley for at least a year already.
“It has likely been here for a few years based on the damage we've seen," Rijal said.
This invasive beetle overwinters in remnant nuts (i.e. mummy nuts) that are left in the tree or on the ground following the previous year's harvest. Adults move onto new crop nuts around hull-split, where they deposit their eggs directly onto the nut. The larvae that emerge feed on the developing kernels, leaving the almond kernel packed with a fine powdery mix of nutmeat and frass that is sometimes accompanied by an oval-shaped tunnel.
Carpophilus beetle has been well-established in Australia for over 10 years, where it is considered a key pest of almonds. More recently, the beetle was reported from walnuts in Argentina and Italy as well. Carpophilus truncatus is a close relative to other beetles in the genus Carpophilus, such as the driedfruit beetle (C. hemipterus) that is known primarily as a postharvest pest of figs and raisins in California.
Monitoring for carpophilus beetle is currently limited to direct inspection of hull split nuts for the presence of feeding holes and/or larvae or adult beetles. A new pheromone lure that is being developed in Australia may soon provide a better monitoring tool for growers, PCAs and researchers.
“We're lucky to have colleagues abroad that have already been hammering away at this pest for almost a decade,” said Haviland. “Hopefully we can learn from their experiences and quickly get this new beetle under control.”
The ability to use insecticides to control carpophilus beetle remains unclear. The majority of the beetle's life cycle is spent protected inside the nut, with relatively short windows of opportunity available to attack the adults while they are exposed. The location of the beetles within the nut throughout most of their life cycle also allows them to avoid meaningful levels of biological control.
In the absence of clear chemical or biological control strategies, the most important tool for managing this beetle is crop sanitation.
“Given that this pest overwinters on remnant nuts, similar to navel orangeworm, crop sanitation will be fundamental to controlling it,” Wilson said. “If you needed another reason to clean up and destroy mummy nuts – this is it.”
In Australia, sanitation is currently the primary method for managing this pest. And here in California, new research and extension activities focused on carpophilus beetle are currently in the works.
“It's important that we get on top of this immediately,” said Wilson. “We're already starting to put together a game plan for research and extension in 2024 and beyond.”
If you suspect that you have this beetle in your orchard, please contact your local UC Cooperative Extension farm advisor (https://ucanr.edu/About/Locations/), County Agricultural Commissioner (https://cacasa.org/county/) and/or the CDFA Pest Hotline (https://www.cdfa.ca.gov/plant/reportapest/) at 1-800-491-1899.
/h3>Diabolical Ironclad Beetle: Crush It With a Car and It Still Survives
If you attended the Bohart Museum of Entomology open house last Sunday on beetles, you may have seen what Bohart research associate Brittany Kohler displayed: a live diabolical ironclad beetle, Phloeodes diabolicus. Curious visitors crowded around the flightless beetle, taking multiple cell phone...
A diabolical ironclad beetle, Phloeodes diabolicus, held by Bohart Museum research associate Brittany Kohler. (Photo by Kathy Keatley Garvey)
Open house visitors examine the diabolical ironclad beetle, Phloeodes diabolicus. In back is Bohart research associate Brittany Kohler, who collected the beetles in the Sierra Foothills. (Photo by Kathy Keatley Garvey)