Beekeepers have begun delivering hives to almond orchards and the buds of all varieties are swelling and prepping for bloom. Watch this brief interview with UCCE Farm Advisor Brent Holtz as he shares some important advice with growers regarding bloom fungicide spray timing, and read his monthly Almond Tasks column in Pacific Nut Producer Magazine.
Please thank this video’s sponsor Trece for their industry support.
Research entomologists are getting ready to give invasive pest Brown Marmorated Stink Bug a ‘taste of its own medicine’, as they’ve identified three volatile compounds in certain plants that attract the male. Watch this brief interview with Oregon State University Entomologist Vaughn Walton as he shares how he believes this discovery can be used to monitor and even deter the pest from the orchard. Read more about it in Pacific Nut Producer Magazine. If you’re not currently receiving the print publication, subscribe for free at: https://malcolmmedia.com/subscribe/
Please thank this video’s sponsor George Packing Company for their industry support and come see them at the Nut Growers Society Annual Meeting in Grand Ronde, OR on Jan. 20th.
As more Eastern Filbert Blight resistant hazelnut varieties continue to be planted across the Willamette Valley of Oregon, bacterial blight is quickly becoming the most costly disease issue growers are facing. Younger trees are more susceptible to this disease, and it can be found plaguing nearly every young orchard in the valley at one level or another. Watch this brief interview with OSU Hazelnut Extension Plant Pathologist Jay Pscheidt as he explains the situation and what growers can do about it. Read more about it in Pacific Nut Producer Magazine. If you’re not currently receiving the print publication, subscribe for free at: https://malcolmmedia.com/subscribe/
Please thank this video’s sponsor George Packing Company for their industry support and come see them at the Nut Growers Society Annual Meeting in Grand Ronde, OR on Jan. 20th.
Navel Orangeworm is not the only major pest of California almonds. Leaffooted bug damage is also leading to crop rejections, and unfortunately, growers do not have a lot of tools for managing this pest. Watch this brief interview with Drew Wolter from the Almond Board of California as he explains.
Please thank this video’s sponsor Suterra for their industry support.
As almond growers diligently begin their Navel Orangeworm winter sanitation and “Mummy Shakes” as the Almond Board of California puts it, Modesto grower Bill Brush shares concerns about caring for young almond trees amidst these sanitation efforts. Watch this brief interview with Bill and read more about almond orchard practices in Pacific Nut Producer Magazine.
Please thank this video’s sponsor Suterra for their industry support.
A tiny wasp may be the solution for managing an agricultural pest causing major economic damage to fruit, vegetable, and field crops in North America and Europe.
A female samurai wasp (Trissolcus japonicus) emerges from a brown marmorated stink bug (Halyomorpha halys) egg. (Photo by Elijah Talamas)
Agricultural Research Service (ARS) scientists are currently studying Trissolcus japonicus, commonly known as the samurai wasp, to see if this parasitoid wasp is the right biological control agent for reducing brown marmorated stink bug (Halyomorpha halys) (BMSB) populations outside of Asia.
Biological control is the process of reducing or mitigating pests or pathogens by using the pest’s or pathogen’s natural enemies. The samurai wasp is a known natural enemy for the BMSB in Asia, and researchers are understanding how it behaves in non-native environments.
At the ARS Beneficial Insects Introduction Research Unit in Newark, DE, researchers are observing the behaviors of both quarantined samurai wasps from Beijing and local wild populations. They found these wasps have a strong preference for parasitizing BMSB’s eggs.
“Parasitic wasps have the amazing ability to detect kairomones [chemical substances emitted by one organism and detected by another organism] that are left on surfaces or in the air of their hosts,” said Dr. Kim Hoelmer, research entomologist and research leader at the Beneficial Insects Introduction Research Unit.
“In the field, when a female samurai wasp looks for evidence of her host in the environment, she can detect her host’s kairomones left on a leaf’s surface. The wasp increases her search when she detects the kairomones and that increases her probability of finding the host.”
The research shows promise in that samurai wasps prefer their natural hosts’ eggs over those of other species.
This finding does not surprise researchers since it is common for parasitoid wasps to have close relationships with their hosts.
“The more intimate the relationship is, the better parasitoid wasps are as biocontrol agents,” said Dr. Matt Buffington, research entomologist with the ARS Systematic Entomology Laboratory, located in the Smithsonian National Museum of Natural History in Washington, DC.
The tiny size of the samurai wasp (Trissolcus japonicus) is apparent from this dime, which has several of the insects sitting on it. (Photo by Ashley Colavecchio)
Buffington and postdoctoral ARS scientist Elijah Talamas were instrumental in correctly identifying the samurai wasp from other Trissolcus species.
“Parasitoid wasps play major roles in population regulation [of pests]. With this one species, we can explain how biological control works in our environment,” said Buffington.
But do samurai wasps exhibit the same behaviors in the wild?
In addition to laboratory studies, researchers are observing samurai wasps in natural environments, such as orchards and crop fields, where the BMSB is present. These wasps are adventive in North America, meaning they arrived accidentally without any human aid.
At the ARS Appalachian Fruit Research Station in Kearneysville, WV, researchers are studying how samurai wasps reduce BMSB populations across a landscape. The research aims to determine if samurai wasps can survive in areas with other agricultural factors such as pesticides.
According to research entomologist Dr. Tracy Leskey, BMSB populations can disperse and develop in areas outside of orchards and crop fields. The stink bugs constantly reinvade new areas, called wild host habitats, for survival.
“We hope that samurai wasps can reduce those populations in wild host habitats, so we have less pressure in our agricultural areas,” said Leskey.
The wasp is tiny; approximately 1.5 mm or the size of a sesame seed.
Even though the samurai wasp shows promise as a biological control agent, researchers must follow a rigorous process to ensure that the samurai wasp’s impact is limited to its host and is not a threat to animals, humans, and crops.
ARS researchers are in the process of requesting a permit for quarantined samurai wasps from Beijing to be approved for field release. Currently, wild populations of the samurai wasp are in 14 states. The permit would allow states without wild populations to use the wasp as a biocontrol agent for managing their BMSB populations. In addition, the permit would allow states with existing wild populations to introduce new samurai wasps in their management efforts.
BMSB has been detected in 47 states and four Canadian provinces. BMSB is responsible for crop damage costing millions of dollars each year. This pest is also causing agricultural damage abroad after its infestation in European countries.
