{"id":15734,"date":"2018-07-11T08:46:05","date_gmt":"2018-07-11T15:46:05","guid":{"rendered":"http:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/?p=15734"},"modified":"2018-07-11T08:46:05","modified_gmt":"2018-07-11T15:46:05","slug":"insect-invaders-and-global-trade-from-growing-produce","status":"publish","type":"post","link":"https:\/\/plantingseedsblog.cdfa.ca.gov\/wordpress\/index.php\/2018\/07\/11\/insect-invaders-and-global-trade-from-growing-produce\/","title":{"rendered":"Insect invaders and global trade – from Growing Produce"},"content":{"rendered":"
\"\"

Insect invaders in California – Asian Citrus Psyllids.<\/p><\/div>\n

By David Eddy<\/strong><\/p>\n

EXCERPTED<\/strong><\/em><\/p>\n

As Japan rebuilt its economy in the decades following World War II, it shipped goods to U.S. consumers who loved the low prices. In more recent decades, China has taken Japan\u2019s role as the low-cost shipper to the U.S. The way Hannah Burrack sees it, it just makes sense we have all these invasive pests from Asia.<\/p>\n

\u201cWe get our bugs from where we get our stuff, and if we continue to do that, we will continue to get greater numbers of pests,\u201d she says. \u201cThat\u2019s basically the bottom line.\u201d<\/p>\n

Burrack, an Entomology Professor and Extension Specialist at North Carolina State University, is not alone in her assessment. On the other side of the country, Mark Hoddle notes it\u2019s not just the shipments of goods that are bringing in pests. An Extension Specialist in Biological Control at the University of California, Riverside, he points out that 61 million people use the Los Angeles International Airport each year, with international flights to 58 countries.<\/p>\n

We think it\u2019s all boiling down to travel, especially tourism and trade,\u201d he says. \u201cThere are lots of opportunities for those pests to come in.\u201d<\/p>\n

Though Hoddle, too, says he sees more pests coming in with cargo than on suitcases. Modern technology, one of the drivers of our global economy, is certainly having an effect.<\/p>\n

\u201cIn the old days, ships would take three months to go halfway around the world \u2014 the pests might starve,\u201d he says. \u201cThese boats are much faster and stop at more places; that\u2019s why it\u2019s happening.\u201d<\/p>\n

And make no mistake, it is happening. Hoddle says until 1989, six new arthropods entered the U.S. per year through California alone. That figure went up to an average of nine per year between 1990 and 2010, a 50% increase. According to the Entomological Society of America, invasive species are responsible for up to 50% of the crop losses in California, a state that produces half the nation\u2019s fruit and nut crops.<\/p>\n

As for the nation as a whole, the society estimates the U.S. is adding about 11 new exotic species each year, with about seven of those being important pests. Overall, it estimates that invasive species \u2014 including both insects and weeds \u2014 cost the U.S. more than $122 billion per year.<\/p>\n

Four of these invasive insects from Asia have garnered a lot of attention, both because they are relatively new to the U.S., and because they have the potential to do a lot of destruction. We talked to entomologists around the country to gain better insight on these pests: spotted wing drosophila (SWD), brown marmorated stink bug (BMSB), Asian citrus psyllid (ACP), and the newest member, spotted lanternfly (SLF).<\/p>\n

Asian Citrus Psyllid<\/strong>
\nAsian Citrus Psyllid (ACP) has wreaked havoc on the Florida citrus industry, where it landed 20 years ago just north of the port of Miami. Hurricanes have since spread ACP throughout the state, along with the incurable disease it carries, Huanglongbing (HLB).<\/p>\n

ACP spread to Texas in 2001 and arrived in California\u2019s San Diego County in 2008. In the decade since, the $2 billion California citrus industry has spent millions to find ways to defeat the pest and limit HLB. For now, they are winning, but how long that will last is anyone\u2019s guess.<\/p>\n

The industry has been successful so far because it has been aggressive in going after ACP in the San Joaquin Valley, where most of the state\u2019s commercial citrus groves are found. Another factor in their favor is ACP prefers the warm, uniform Southern California climate to the San Joaquin Valley (SJV), which is more extreme.<\/p>\n

Hoddle, the specialist in biological control at UC Riverside, takes full advantage of the warmer, more moderate climate. He has made several trips to places like Pakistan in search of such parasitoids as\u00a0Tamarixia\u00a0<\/em>radiata, a wasp.<\/p>\n

Hoddle says he and his team just finished studying three years of data, and while ACP is continuing to spread, it\u2019s been slowed in part because of biocontrols. They think the parasitic wasps have cut the population by 70% in Southern California backyards.<\/p>\n

\u201cWe can\u2019t say definitively it has led to the slower rate of the psyllid, but there are fewer of them around, so it stands to reason,\u201d he says. \u201cThere still haven\u2019t been any blow-ups in commercial citrus, and that\u2019s the idea. We\u2019re buying the growers\u2019 time by fighting this battle in these urban areas.\u201d<\/p>\n

Brown Marmorated Stink Bug<\/strong>
\nBMSB (Halyomorpha\u00a0<\/em>halys) is perhaps the most familiar of the four because it is so pervasive. Since initially landing in Pennsylvania, it\u2019s now found in 44 states, \u201ceverywhere but the plains and deserts,\u201d says Jim Walgenbach, a North Carolina State University Extension Entomologist who is Director of a USDA project, Management of BMSB on U.S. Specialty Crops.<\/p>\n

It\u2019s an intensive national effort, with a team of more than 50 researchers from around the country. With the catchy website,\u00a0StopBMSB.org<\/a>, they have a national monitoring program to find where BMSB is established and where it\u2019s expanding, as well as modeling populations to find the greatest risks to specialty crops.<\/p>\n

Researchers have traps set in 300 locations, \u201cfrom New York to Georgia, California to Washington, and almost everything in between,\u201d Walgenbach says.<\/p>\n

They intensify efforts wherever they are needed. Last year, for the first time, BMSB went after northern Utah tree fruits, and this year the big concern is California tree nuts. In fact, just recently, BMSB has been targeting almonds. In the near future, they plan to set additional traps in Michigan.<\/p>\n

Researchers are now focused on a biological control program, which they believe is critical, Walgenbach says. It revolves around the samurai wasp, which attacks BMSB eggs. It\u2019s a native of Asia, where it causes a high degree of mortality. In the U.S., it was first picked up in 2014 in Maryland.<\/p>\n

Walgenbach says the parasite represents the greatest potential to reduce populations. Most of the natural enemies of our native stinkbugs are poorly adapted to BMSB and won\u2019t be nearly as much help as the samurai wasp.<\/p>\n

\u201cWe don\u2019t expect it to wipe them out,\u201d he says. \u201cBut instead of a serious large invasion, populations will be reduced and only occasionally reach pest status and require supplemental control.\u201d<\/p>\n

Spotted Lanternfly<\/strong>
\nSpotted Lanternfly (SLF) is by far the newest of the four to the U.S., having been discovered in 2014. Like BMSB, it was initially found in Pennsylvania.<\/p>\n

Why both in Pennsylvania? One explanation put forth by Penn State Tree Fruit Research Entomologist David Biddinger is both were found somewhat near Philadelphia, the busiest port on the Eastern Seaboard.<\/p>\n

Since then there have been detections in several nearby states, which doesn\u2019t surprise Sven-Erik Spichiger, Pennsylvania Department of Agriculture Entomology Program Manager.<\/p>\n

\u201cIt is such a good hitchhiker,\u201d Spichiger says, echoing what others have said. \u201cThere\u2019s a great possibility there are populations that haven\u2019t been found.\u201d<\/p>\n

SLF is unique. It is from a group of insects that are tropical and aren\u2019t economic pests. Out of 900 fulgoroid species, also known as lanternflies \u2014 most closely related to leafhoppers in the U.S. \u2014 SLF is the only economic pest. No fulgoroids are found naturally in Pennsylvania.<\/p>\n

Spotted Wing Drosophila<\/strong>
\nSWD has become enemy No. 1 in many of the nation\u2019s small fruits, including cherries and berries. But in some places the pest is more difficult to battle than others. In the arid West it is still very much a threat, but generally easier to deal with than in areas of the East and Midwest where rain can wash away pesticide sprays.<\/p>\n

In Michigan, tart cherries represent an even bigger problem than sweet cherries, says Michigan State University\u2019s Nikki Rothwell. With such tight margins, pesticide sprays are tough to afford. Rothwell, who serves as Coordinator of the Northwest Michigan Horticultural Research Center, says tart cherry growers have one thing going for them: SWD doesn\u2019t get active until temperatures get warm.<\/p>\n

\u201cIf growers can harvest before they hit, fine,\u201d she says. \u201cBut if harvest goes long because of a big crop, we see SWD populations grow exponentially.\u201d<\/p>\n

\u201cThey seem to like the dense canopy, lots of shade, high humidity, but still nice and warm,\u201d she says. \u201cPressure was really heavy in those blocks with 15-year-old trees that hadn\u2019t been pruned in years.\u201d<\/p>\n

Link to full article<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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