Swipe Left or Right to navigate Alerts
All Crops All Locations
Posted on: April 20, 2017 by Rich Guggenheim
Chemical control of Bur Buttercup (Ceratocephala testiculata) can be effective when weeds are extremely young. Mowing and burning is an effective cultural control as is hand pulling. The weed is now beginning to reach flowering and has entered the reproductive state. Bur Buttercup is also toxic to livestock. Always follow label instructions. Rotating pesticide mode of action can reduce the occurrence of pesticide resistance.
Malheur County Weed Advisory Board White-top Program
Announcements Treasure Valley Oregon
Posted on: April 20, 2017 by Bill Buhrig
The annual white-top and perennial pepperweed focus days are quickly approaching for Malheur County residents. Please check out the attached flier and link for more information. This is a good program and we thank County Weed Supervisor Gary Page and Co. for their hard work on this!
Landscape and Garden All Locations
Posted on: April 17, 2017 by Rich Guggenheim
Nymphs of the Apple aphid, which overwinters as an egg has been detected on ornamental landscape varieties of apple and crabapple. Although they rarely cause economic loss to trees, control may be desired in the home landscape for cosmetic purposes.
The best timing for woolly apple aphid control is petal-fall with a systemic insecticide, or during the summer with an effective contact insecticide. Application of dormant oil plus an insecticide at delayed dormant stage (half-inch-green) may
provide season-long control of green and rosy apple aphids.
Onion Maggot Advisory for Malheur County
Onion Treasure Valley Oregon
Posted on: April 14, 2017 by Stuart Reitz
ODA Pesticides Program has identified a limited number of pesticide products with labels allowing applications to cull piles. Those products are:
Ecozin Plus (AMVAC),
Malathion 8F (Gowan) and
Malathion 5EC (Arysta).
The Advisory and Labels for the four products specified in the Advisory are available on the Malheur County Website: http://extension.oregonstate.edu/malheur/agriculture.
The directions for applications to cull pile areas on the labels may indicate mosquitos as the target pest, but it is the specific use site (cull piles) that is necessary for the applications to be legally allowed, regardless the specific pest being targeted.
Please note, this advisory is for Oregon. The Idaho Department of Agriculture has issued information for Idaho.
Please contact David Priebe, Rose Kachadoorian, or Dale Mitchell if you have questions or concerns about the advisory for Malheur County.
David Priebe (503)986-4656 / firstname.lastname@example.org
Predicted Lygus emergence
Alfalfa Seed Treasure Valley
Posted on: April 7, 2017 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition shows that, depending on your location in the Treasure Valley, we have accumulated 78 degree days between January 1, 2017 and April 6, 2017. This is 8 days behind compared to this date in 2016 and 7 days ahead of the 30-year average. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now that is predicted to occur about May 15.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected. We will plan to put out another alert in early May, but you can monitor degree day accumulation using the link provided below as follows:
1) Select the location nearest you by selecting the appropriate pin in the map at the top of the page. The above data are for the Parma location. Results likely will vary depending on the location selected.
2) Select “insects” in the category drop down box under the map, then select the “Lygus bug [alfalfa seed] Ben Simko 2000” model from the “model params” drop down box.
3) The predicted date for the 272 degree day accumulation for peak 1st and 2nd instar lygus nymphs will be listed in the “DDs Event” text box. You also can view the full model output by selecting the button labeled “Click here to CALC/ RUN model w/daily output”
The link below will take you to the growing degree day model.
Thanks for Dr. Jim Barbour for this information.
Red band needle blight
Landscape and Garden All Locations
Dothistroma Mycosphaerella pini
Posted on: April 6, 2017 by Rich Guggenheim
Red Band Needle Blight of pines is caused by Mycosphaerella pini. Austrian pines are most susceptible, followed by ponderosa and mugo pines.
Symptoms include brown needles (often the base of needles remain green), premature needle drop, loss of vigor, and a slow decline. Needle injury may resembling winter injury or scorch, however, diseased needles will also show gumming and sometimes broken tips that are an ashy-gray color. In addition, dothistroma infections usually occur on the lower and/or inner branches, where moisture is greatest.
Infections occur anywhere on a needle, leaving a “red band” (another name for this disease). The disease often works its way from the bottom of the tree up. In spring and early summer, an infected tree will have brown interior needles, and infections on the current season’s needles will not show browning until fall.
For severely infested trees, fungicide treatments should be applied soon, before budbreak. In Utah’s dry climate, infection rarely gets to the point of necessitating chemical treatment, however.
Treatment: Although infections can occur throughout the season, only spring treatments of fungicide (when necessary) are necessary. Three applications of either copper hydroxide (Kocide), copper hydroxide+mancozeb (Junction, Mankocide), or other copper (Bonide, Camelot) may be necessary, starting at budbreak and twice again at 10- to 14-day intervals.
Diseases in Cereals - Look Out for Stripe Rust
Small Grains All Locations
Stripe rust and other diseases in cereals
Posted on: April 6, 2017 by Juliet Marshall
Current Situation with Cereals in Southern Idaho
First the good news!
There is a lot less damage in the area from snow mold and barley yellow dwarf than I expected. Good for our growers! Bad for me! Even my snow mold testing plots in Tetonia did not get as much snow mold as I was hoping. So far, the damage we see in our winter grain is related to excessive water, ponding, and successive freeze/thaw cycles. Not unexpectedly, winter wheat survived this stress much better than the winter barley. I know many people are already reseeding or have already seeded a spring crop into the dead areas of the winter (especially in wheat - a soft white wheat into a soft white winter, for example). This should be done as soon as possible to minimize the differing crop growth stages between the two crops. This is harder to do if you have a winter malt barley as mixing barley varieties will not work under contracted malt barley.
Now the bad news. HEADS UP, Western Idaho! You will be the first to see incoming stripe rust, if you don’t already have it. I am afraid we need to be prepared for a bad stripe rust year. Both Dr. Mike Flowers, OSU, and Dr. Xianming Chen have confirmed stripe rust throughout Oregon and Washington production areas. Mike said today the early planted winter wheat in Eastern Oregon has widespread stripe rust occurring in susceptible varieties. Xianming Chen also reported potentially heavy pressure and widespread occurrence throughout Washington, with stripe rust showing up a month earlier than average, foreboding a stripe rust year similar to 2011.
I have AS YET to find stripe rust overwintering in our winter wheat. It does not mean that it is not present! Please be sure to scout the susceptible varieties for stripe rust. If you have a field of Brundage soft white winter wheat for example, scout it soon and please let me know if you have stripe rust! The sooner we scout, confirm, and treat an infected field, will can reduce yield loss, and the sooner our neighbors can be forewarned about protecting their crop - yes this is a community disease!
WHAT IF I FIND STRIPE RUST? When should I apply fungicides?
The general recommendations this year will include applications of preventative fungicide at herbicide timing for susceptible varieties - PRIOR to even seeing stripe rust. Applications may need to continue as needed. Resistant varieties should not need fungicide applications - however, keep an eye on all varieties. Stripe rust races change. Even moderately resistant varieties may need an application of fungicides to reduce yield loss in severe years - if 5% of the plants in the field show stripe rust, applications of triazole-containing fungicides is recommended. Strobilurins and triazoles are protective, and triazoles are better at reducing spread in already infected plants.
Please note that BARLEY is not immune. We saw higher than normal levels of barley stripe rust in the plots near Aberdeen last year. I even saw stripe rust in triticale! (It did not cause yield loss - it was just interesting - to me.) Usually, barley stripe rust does not cause enough damage to warrant fungicide applications.
What else should I be watching for in cereals?
Winter wheat - take-all and straw breaker - especially with high soil moisture conditions. Definitely stripe rust - higher moisture always increases the chances of stripe rust spreading rapidly. Maybe powdery mildew, especially in heavily seeded fields..
Spring wheat - Stripe rust. Select a resistant variety to plant or be prepared to apply fungicides. Pythium can be a problem in cold, wet soils, especially with heavy crop residue (see the notes on Pythium in spring barley). Cereal cyst nematodes could be a problem too, especially in wetter soils.
Winter barley - winter kill has occurred in low areas of the field. In wetter weather, watch for the development of scald and / or spot form of net blotch. Barley stripe rust may also be present, but usually does not occur at damaging levels.
Spring barley - last year I saw powdery mildew in seedling barley. I was very surprised. It can easily be controlled with fungicides at herbicide timing. (Be aware of potential “hot” mixes by combining herbicides and fungicides - the damage risk increases with use of crop oils.) Stripe rust may be more of a problem in six-rowed varieties. Spot form of net blotch (SFNB) and scald will be problematic in wetter years, especially if you have crop residue of barley in no-till situations. Pythium will be a problem when planting into cold, wet spring soils. Last year we found mefanoxam resistant Pythium in a barley field. If your seed treatment (metalaxyl or mefanoxam) does not seem to be effective, let us know! Cereal cyst nematodes could be a problem too, especially in wetter soils.
TWO EARLY TO PREDICT:
Bacterial streak in barley, black chaff in spring wheat, and FHB in spring cereals. Stay tuned.
Degree Days for 2017
Landscape and Garden All Locations
Posted on: March 28, 2017 by Rich Guggenheim
Degree days for 2017:
Caldwell has reached 101 degree days. Estimates and forecasts are calling for estimated biofix 175 DD to be April 20. Easter week would be a good time to put traps out and begin monitoring for insects.