New pest infesting almonds and pistachios in the San Joaquin Valley – Food Blog


Crop sanitation will be crucial to managing the intrusive carpophilus beetle

Growers and insect control advisors (PCAs) must watch for a brand-new insect called carpophilus beetle ( Carpophilus truncatus). This insect was just recently discovered infesting almonds and pistachios in the San Joaquin Valley, and is acknowledged as one of the leading 2 insects of almond production in Australia. Damage happens when larvae and grownups feed straight on the kernel, triggering decreases in both yield and quality.

Populations of carpophilus beetle were very first discovered in September in almond and pistachio orchards by University of California Cooperative Extension Specialist Houston Wilson of UC Riverside’s Department of Entomology. Bug recognition was consequently verified by the California Department of Food and Agriculture.

Views from different angles of a carpophilus beetle

Adult carpophilus beetles as seen from the (A) dorsal, (B) ventral, (C) left lateral and (D) anterior end. Photos by Sarah Meierotto, UC Riverside

Wilson is now dealing with Jhalendra Rijal, UC incorporated insect management consultant, North San Joaquin Valley; David Haviland, UCCE farm consultant, Kern County; and other UCCE farm consultants to perform a wider study of orchards throughout the San Joaquin Valley to identify the level of the break out.

To pistachio, date or almond orchards plagued by carpophilus beetle have actually been verified in Stanislaus, Merced, Madera and Kings counties, recommending that the facility of this brand-new insect is currently prevalent. Some specimens from Merced County were from collections that were made in 2022, recommending that the insect has actually been present in the San Joaquin Valley for at least a year currently.

” It has actually likely been here for a couple of years based upon the damage we’ve seen,” Rijal stated.

This intrusive 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. Grownups move onto brand-new crop nuts around hull-split, where they transfer their eggs straight onto the nut. The larvae that emerge eat the establishing kernels, leaving the almond kernel loaded with a great grainy mix of nutmeat and frass that is often accompanied by an oval-shaped tunnel.

Carpophilus beetle has actually been reputable in Australia for over 10 years, where it is thought about a crucial insect of almonds. More just recently, the beetle was reported from walnuts in Argentina and Italy. Carpophilus truncatus is a close relative to other beetles in the genus Carpophilus, such as the driedfruit beetle ( C. hemipterus) that is understood mostly as a postharvest insect of figs and raisins in California.

Monitoring for carpophilus beetle is presently restricted to direct evaluation of hull split nuts for the existence of feeding larvae and/or holes or adult beetles. A brand-new scent lure that is being established in Australia might quickly supply a much better tracking tool for scientists, pcas and growers.

” We’re fortunate to have coworkers abroad that have actually currently been hammering away at this insect for practically a years,” stated Haviland. “Hopefully we can gain from their experiences and rapidly get this brand-new beetle under control.”

The capability to utilize insecticides to manage carpophilus beetle stays uncertain. Most of the beetle’s life process is invested safeguarded inside the nut, with fairly brief windows of chance offered to assault the grownups while they are exposed. The area of the beetles within the nut throughout the majority of their life process likewise enables them to prevent significant levels of biological control.

In the lack of clear chemical or biological control techniques, the most crucial tool for handling this beetle is crop sanitation.

” Given that this insect overwinters on remnant nuts, comparable to navel orangeworm, crop sanitation will be basic to managing it,” Wilson stated. “If you required another factor to tidy up and damage mummy nuts– this is it.”

In Australia, sanitation is presently the main approach for handling this insect. And here in California, brand-new research study and extension activities concentrated on carpophilus beetle are presently in the works.

” It’s crucial that we get on top of this right away,” stated Wilson. “We’re currently beginning to create a strategy for research study and extension in 2024 and beyond.”

If you think that you have this beetle in your orchard, please call your regional UC Cooperative Extension farm consultant (, County Agricultural Commissioner ( and/or the CDFA Pest Hotline ( at 1-800-491-1899.

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