WSU Tree Fruit Research & Extension Center

Spotted Wing Drosophila

Thursday, November 23, 2017

SWD Project Logs for 2011

Friday, October 28:SWD trap catch has remained fairly consisted through October at moderate levels. Captures continue to be much lower than 2010.
Monday, September 19:The following is a summary for the Beers program traps for the week of 12-16 September:  Trap catch remained higher this week, following the same pattern as last September, but with lower numbers overall. We caught 260 adults last week, compared to 1,821 adults in the same week in 2010. Most of the flies were caught in cherries (where most of the traps are, although peach and apricot traps are also catching.  The limited number of grape traps in the Beers program are still zero; there were a few caught in apple and pear traps.  Average SWD/trap are slightly higher in the I-90 south traps (0.21) vs the I-90 north traps (0.13).  The higher numbers from the south are in Mattawa and the Tri-Cities, while the higher numbers in the north are from Orondo, and to a lesser extent, Brewster.  A total of 83 traps were positive last week.  Catch has occurred in all regions at this point.
Friday, August 19:First trap catch in  the Othello area. The following is a summary for the Beers program traps: trap catch remained elevated this week, with two-thirds of the catches in the south (Mattawa and Tri-Cities).

5,231 samples processed to date

126 SWD caught to date; 43 the week of Aug 14-19.

123 in cherries, rest in stone fruits and blueberries

34% of total caught the past week, 8.9% of the samples positive  

Wednesday, August 17:First catch in Chelan-Manson area today.
Saturday, August 13:Activity has picked up slightly in the last week, but relative to last year, things are still pretty slow.  The following is a summary for the Beers program traps:

  • 83 SWD to date, with a total of 22 positive traps (some were positive for more than one week).
  • 81% were caught north of i90;
  • 78% were caught in Orondo alone (note, however, that Orondo is trapped more intensively than other areas).
  • 100% were caught in cherry (but, 82% of our samples come from cherries).
  • 81% were caught this past week (8-12 August); 4.3% of the traps were positive

Last year at this time we (9-13 August 2010), we had caught 185 SWD, with 67 positive trap samples, or 25% of the traps positive.

Friday, August 5:First fly has been found in the Wenatchee area.  This makes 8 regions with positive traps. 
Thursday, August 4:6 males in 4 traps found yesterday, in Orondo, Rock Island, and Mattawa districts; the latter two are fist catches for these districts.  To date, 7 regions have positive catches.  
Wednesday, August 3:the larval report from yesterday was NOT SWD - however, the principle is still valid - other regions have had larval finds before traps caught adults.  Its still not a bad idea to cover up.
Tuesday, August 2:We all know we are having a late year in terms of fruit maturity; the same is tree for insect development.  As a basis for comparison, we had caught 277 SWD by this time in 2010; this year we have only caught 28 to date.  It is likely that cherry growers have a much tighter spray program in 2011; this may also be contributing to low trap captures. 
Friday, July 29:A few flies captured this week, all in Orondo.  Numbers overall remain very low. Five regions now have positive catches.
Friday, July 15:There has been a new regional find today of SWD, in the Brewster area. One male. This find was from a private trap, and many thanks to the folks willing to share their information and alert growers in their area.

Stay tuned, as we expect more regions to start showing up with positive finds. Or, if your fruit are within 2 weeks of harvest and you prefer to be proactive, cover up.

Wednesday, July 13:First catch in the Orondo area - highest per-trap count to date (2 females, 4 males).  Its show time, folks.
Friday, July 8:No new catches from eastern Washingon traps this week. As cherry harvest is well underway, we may have many regions that escape from SWD attack this year.
Wednesday, June 29:A revised SLN for Entrust was issued yesterday, 28 June.  This revised label allows essentially the same use pattern as the main label, except that the PHI is 3 days instead of 7.  The revised label allows 9 oz/season and a maximum rate of 2.5 oz/application.  This supersedes the earlier SLN released 3 May. The revision was based on the study by David Haviland in California earlier this year, and should be extremely helpful to organic cherry growers.
Monday, June 27:Three regions have now caught flies, although numbers are very low.  Expect more regions to have first capture in the next few weeks. With harvest underway in some of the earlier areas, most of the later areas will close to, if not at, the susceptible stage for attack (blush).  Continue cherry fruit fly control in the meantime if your area has not yet caught flies.
Thursday, June 9:

We have the first 2011 capture of SWD in eastern WA from a trap collected yesterday, June 8

One male in an ACV trap in the Tri-Cities area.  We are recommending that growers in this region begin crop protection sprays when their cherries reach a susceptible stage (blush). 
Friday, June 3:We are still fly-free here in eastern WA, but not because we haven't been looking.  Between the Beers and Walsh programs, we are looking at ca. 666 traps each week, and have processed some 3,473 samples!  That's a lot of apple cider vinegar.  Still lots of nontarget drosophila, just not SWD.

A new feature of this website in beta testing is the ability to create custom charts from our trap database (see link at bottom of page).  You can create an xy chart plot of avg. flies/trap/week over time, or a bar graph by crop or region.  The xy plots can be narrowed by region, crop, or growing regime (organic/conv).  A new feature we are testing is the ability to make custom lists of your traps - if you know your trapcode(s), you can enter it, and have only your traps plotted.  You can browse the 2010 data, and now the 2011 data (its all zeros...).  To find the trapcode, just look at the trap in your orchard, find the white plastic laminated barcode label on the side, and the human-readable translation will be in tiny letters on the below the bars.  All Beers program traps are barcoded, with format BE-XXX-NNN.  (The BE is for BEERS).  All letters should all be uppercase.

Let us know how it works.

Friday, May 27:Still no SWD in eastern Washington traps as the early cherry districts head into straw color. Cool weather has kept crop (and insect) development up to several weeks behind normal, so it may be a while before we catch anything.  Or not.  Note that finding hundreds of other drosophila in our traps is common - the new record is ca. 2500 of non-pest drosophila in one trap. 
Tuesday, May 24:The Cherry Maximum Residue Level (MRL) reports are out and available on the Tree Fruit Research Commission's website

As you develop your program for 2011, remember that the flip side of the coin for zero residues may be no fruit protection left, either!

Friday, May 20:Its been another quiet week in the SWD trapping program - over 2,560 samples processed between the Beers and Walsh programs, with lots of other drosophila in the traps, but no SWD.  We have good coverage of eastern Washington's fruit growing regions from a geographic standpoint (Canadian Border to Tri-Ciites, and along Oregon border) and in crops (cherry, peach, nectarine, apricot, pluot, apple pear, blueberry, raspberry).  Thanks again to all the fieldmen who helped us site these traps.

The graphing feature of the website (where you can graph by region, crop, organic/conv etc) is available for testing for the 2010 data --See the link at the bottom of the page.  The 2011 data will become functional as soon as we have something besides zero's.

The MRL study done this spring in California is completed and the report should be available sometime next week - stay tuned. 

Thursday, May 5:FIRST CAPTURE has occurred in Hood River, according to Peter Shearer...an adult female from a backyard apple cider vinegar (ACV) trap. 
Tuesday, May 3:A Washington state SLN (Special Local Needs, or 24(c)) for spotted wing drosophila control with Entrust was issued  May 3, 2011. This label allows use of Entrust with a 3-day PHI (the main label specificies a 7 day PHI); however, the SLN label is limited to a total of 6 oz per year and 2 oz per application.  When three applications are made, one may be made up to 30 days PHI, another up to 10 days PHI, and a third at 3 days PHI. This SLN may be of more utility to conventional growers seeking a short PHI material for use close to harvest; depending on pressure, organic growers may prefer to use the 9 oz/7 day PHI limits on the main label.

2011 Seasonal Progress

Growing District Traps deployed

First fly captured?

Oroville/Tonasket

yes

YES

Okanogan/Omak

yes

YES

Brewster/Pateros

yes

YES (15 July)

Chelan/Manson

yes

YES (17 Aug)

Orondo-Beebe Bridge

yes

YES (13 July)

Entiat

yes

YES

Wenatchee/E. Wenatchee,
Wenatchee River Valley

yes

YES (4 Aug)

Stemilt Hill/Wenatchee Heights

yes

YES

Rock Island/Malaga

yes

YES (3 Aug)

Quincy/Moses Lake

yes

YES

Royal City

yes

YES

Othello

yes

YES (16 Aug)

Mattawa/Desert Aire

yes

YES (3 Aug)

Yakima/Tieton

yes

YES (27 June)

Union Gap-Zillah

yes

YES

Sunnyside/Prosser

yes

YES (20 June)

Tri-Cities

yes

YES (8 June)

Tree Fruit Research & Extension Center, 1100 N Western Ave, Washington State University, Wenatchee WA 98801, 509-663-8181, Contact Us