Some growers tend to think of birds as chronic annoyances. Solutions range from preventative tactics (netting and birddogs) to scare tactics such as artificial predator calls and driving around the farm firing empty shells at murders – sound familiar?
But a new study suggests that certain birds can – and should – be welcomed as a part of an overall sustainable farming strategy. The link below explains:
The email that went out to subscribers Monday clarified that yes, we are done monitoring and reporting for the 2019 season. You can read that message here.
But please do continue to visit this blog for these and other updates:
Summarizing 2019 pest trends
A comprehensive written report will be available at the vegetable grower’s meeting and OPVC website by Jan 2020.
Investigating why corn earworm was so minimal in W. Oregon but very abundant E. of the Cascades and also in the midwest.
Cabbage looper outbreak: if it affected load rejections; possible prediction of outbreaks; how new methods of counting became necessary due to 1200+ moths per trap (see photo below)
Continued armyworm trapping
Cooperators in Tillamook county will continue to operate pheromone traps and scout fields through October because fall activity is common.
Trap counts are updated each week http:// beav.es/ZY3 and we are in the process of mapping them to examine if any geographical patterns are evident.
23 years of a darn-solid phenology dataset is nothing to scoff at. I have spoken with some of you about collaborating on a journal article. Dan would be proud, and I…well..need to. Maybe we’ll have enough rainy days this winter to actually accomplish it. Contact me if you’re interested.
We have received many emails this week about ‘home invasions’ of odd-looking bugs. In each case, the culprits were boxelder bugs. Although easily recognized as adults, the partially mature phase (nymphs) can be unfamiliar.
Nymphs and adults aggregate in large groups, especially on light-colored homes with a warm-facing side. The concern for damage on ornamental or fruit trees is low. Rather, these are considered a nuisance pest. The sheer and sudden numbers of them is what causes calls to come in.
Remember to subscribe to receive up-to-date information via email! We alert you of insect pest activity for nearly half the year (24 weeks), the service is currently free, and we promise to not bother you for the other 28 weeks, nor share your email address.
Notable trends during the week of June 24th include:
Cabbage Looper moth counts continue to be extremely high, we are likely seeing the 2nd generation, which is considered the most damaging for brassica crops.
Armyworms have wide host ranges but can be especially damaging in grasses, pastures, and field crops.
One species, in particular, seems to be booming this year. It is called the “Thoughtful Apamea“, which is closely related to glassy cutworm, but habits and host range are largely unknown.
Conversely, True Armyworm is well-studied and we have been collaborating on a project to monitor them in Tillamook County. So far, counts are low, but if you’re interested, trap counts will always be posted here: https://beav.es/ZQM
Beneficial Insects include pollinators, predators, and parasitoids that provide some type of ecosystem service. As natural enemies of pests, their activity tends to lag slightly. We have noted an increase in Syrphidae and Tachinidae flies this week, as monitored by passive sampling techniques.
This “CAUTION” post is similar to one I made a few weeks ago for cole crops; a quick way to highlight a potential problem, in hopes that consultants, gardeners, etc., will do some scouting to investigate if/to what extent they may be affected.
We saw, for the first time this season, some westernstriped cucumber beetle (Acalymma trivittatum) activity on both both weedy volunteer and cropped cucurbits.
This pest is of particular concern because it vectors bacterial wilt, a plant pathogen caused by Erwinia tracheiphila bacteria. Researchers now suspect that, rather than overwintering in the intestinal tract of adult beetles, the bacterium overwinters in the sap of alternate host plants (i.e. volunteer and weedy cucurbit species). The alternate host plants may not show symptoms of being infected, which can make management difficult.
As adult cucumber beetles feed, the beetles become infected with bacterial wilt, and then transmit it to crops. This infection can be direct (feeding on one host then another), or secondary (fecal contamination of already wounded tissue). Once the disease is established, it cannot be managed with pesticides, so ‘awareness’ of cucumber beetle activity levels, and subsequent control if necessary, is considered the best preventative tactic.
A few tips for scouting bacterial wilt in cucurbits:
Melons, squash, and cucumber are considered more susceptible than zucchini and watermelon, but all related plants (Cucurbitaceae) are at riska
Damage can occur quickly – scout 2-3X/week for beetle pressure and wilt symptoms
Symptoms can be immediate on some plants, and not occur until after fruiting on others
Leaves may look dull green, yellowing at leaf margins
Vines wilt during the day, but seem to recover at night
Quick diagnostic test (photos below): stems/vines are cut close to the crown, and a ‘stringy’ sticky substance appears when the two halves are pressed then pulled apart from each other. b
PHOTO CREDITS: Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org
There is a great new eXtension article about biology and management of cucumber beetles in organic farming systems available at: https://beav.es/ZYJ (it’s ok – we’ll use a Beavs shortlink to promote WSU just this once…there’s some great people/research going on up there!)
aDISCLAIMER: regional differences in pathogen expression are likely, do not rely on literature from other areas bDISCLAIMER: may not work for all species or all cases
If you read this title and wondered “where are weeks 1 thru 6?” .. you need to subscribe! Weekly reports are sent directly by email, but sometimes there is so much happening, I have to do a mid-week update via blog. This is one of those weeks!
The cabbage looper outbreak continues, with trap counts averaging 1000 times higher than normal. Yes, you read that right.
12-spot beetles. You see ’em, you know ’em, but did you know they can be devastating underground pests? The pictures below were taken this week on spinach for seed and seedling spinach (yes, there’s a difference).
As adults, beetles chew on foliage, flowers, fruit, corn silks, etc.
As larvae, grubs chew on and tunnel through roots.
For more info about 12-spots, click here; or branch out a bit and learn about the whole rootworm complex that plagues regional growers and gardeners.
Over the past few days, I have seen 300+ cabbage looper moths in traps next to fields that aren’t even out of the ground yet, and been texted twice about flea beetle damage. It seems it will be a busy year for brassica pests!
All the more reason to subscribe! Stay informed by clicking here. We do not share your information, and many of the pests we report on have wide host ranges, which means the data are relevant for home gardens, nurseries, and many commodity crops.
Spring is a critical time to assess wireworm populations because when soil temperatures warm to 50°F, larvae begin to migrate up within the soil column and seek underground plant tissues to feed on. Root crops are most commonly damaged, but chewing on seeds, seedlings, and fruit also have been reported.
I am coordinating a pitfall trapping effort to determine if non-native adult click beetle species are present in western Oregon (contact me if you’d like to participate). To monitor your own fields, bait stations are recommended, because they are a better indicator of actual, larval (wireworm) pressure.
I will post a more detailed pest profile page in the coming weeks, but for now:
For more information, click the link to read a publication by Nick Andrews et. al re: Biology and Nonchemical Mgmt. in PNW potatoes.
2-may-19 update: the PEST PROFILE PAGE is ready, and has more details about how to monitor, ID, etc.
…An uncommon phrase to hear in agriculture, but recent floods will have a dramatic effect and have already caused an estimated $12.5 billion dollar loss in the Midwest. Impacts include crop damage, inability to access fields to work ground or plant, and water contamination.
Here at home, the mainstem of the Willamette River and its tributaries (Long Tom, Mary’s, Callapooia) are in huge swells, with property flooding and road closures abundant. For current updates, check Benton and Linn County webpages or ODOT TripCheck.
From an insect pest point-of-view, the changes that may come about are uncertain, but I will be keeping a close ‘eye to the ground’. Flooding could cause mortality for some species (onion bulb mite, beetles, sawflies), promote growth in others (armyworms, mosquitoes), and have little effect on bugs that overwinter in sheltered areas (BMSB and ladybugs).
‘Twas a dreary day when I could finally get out to our research farm to assess damage to fields. However, our farm manager is resilient and those that have lived here longer say it’s “not that big of a deal”. I guess when you live in Oregon with 300 days of rain, you make your own mental sunshine.