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Umass Cranberry Station cranberries

IPM Message 2014

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April 8 April 22 April 29 May 6 May 22 June 5 June 17 June 27 July 10
July 25

IPM Message: July 25, 2014

We have a new fact sheet (Vine Dieback 2014) showing the various kinds of dieback we have been seeing this season.

If it has been more than 1 week since your last fruitworm spray, you should be checking fruit for unhatched viable eggs. Do not exceed 19.5 oz per acre per season for Delegate. If you are sweeping, you may see cranberry weevil and flea beetles. Belay can be used but only if the bees are gone as it is highly toxic. Check for handler restrictions for this and other insecticides! If you want to treat for grubs (Admire or similar products), now is the time to make your applications.

You are permitted only 2 applications of Callisto total to the bog area. This counts whether applied by boom, chemigation or any combination of application methods. Even if you only apply 4 oz/A each time (thus staying under the 16 oz/A limit), you can only make 2 applications. If you chemigated Callisto and If a portion of your bog did not get treated for some reason (blocked head, etc) and you have weed escapes, you can spot-treat that portion of bog. You should carefully note this in your pesticide records so it does not read as 3 applications to the same piece. Callisto has a 45-day PHI. Poast has a 60-day PHI. Select has a 30-day PHI.

Treatments for fairy ring can go out until July 31. It can only be used once. Treat 3 ft beyond the advancing ring of dying vines and 2 feet within the line. Sul-Po-Mag or K-Mag can be used to help vines recover mid-August through October. Remember that Abound and Indar are considered high risk materials for resistance development; rotate other fungicides into your schedule as needed.

Dodder is definitely showing up on some bogs now. There are not many options left at this point. If the dodder is attached to weeds that are susceptible to Callisto, you can try a Callisto application. If the dodder is mainly attached to cranberry, Callisto will probably not give you the control you are looking for. If you would like to try the hand-held flame torches for dodder control (they work well but take time to treat), call Katie at x43 to see if ours are available for loan. Raking can be done to open up the canopy and allow the sunlight to get to the vines. Some growers have good techniques that marginally impact the fruit and vines. Plastic or bamboo rakes are preferred over metal rakes.

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IPM Message: July 10, 2014

If you are concerned about sprays going out in unstable weather pattern, Altacor should have good residual and rainfastness. Please use the traditional cranberry fruitworm timing for Howes, spraying 7-9 days after 50% out-of-bloom. This is still the best management strategy for this variety. Things seem very late this year as some bogs and varieties are just getting to 50% out-of-bloom this week. Brown spanworm moths are flying.

In addition to the scale issue, the Entomology lab reports several instances of a new beetle showing up. It seems to feed on the petals causing the area of bog to appear as a darker patch. It also feeds on the new growth (see photo). The beetle is very small (smaller than cranberry weevil) and yellowish in color. If you see feeding or the beetle, please let the Ent lab know.

Feeding damage and adult weevil on penny
Photos courtesy of Averill Entomology Lab

We have seen various kinds of vine dieback, which have been related to low areas, water collections and winter injury; yellow vine syndrome from water stress, shallow root systems, and herbicide use; possible "footprint" disease; and unknown causes. We have Mullica Queens coming in with suspicious upright injury. This injury does not appear to be herbicide related and we are still investigating.

Now is the good window to use QuinStar for yellow loosestrife control, if you can use the herbicide as per your handler.

Dodder is starting to show up on some bogs. There are not many options left at this point. If the dodder is attached to weeds that are susceptible to Callisto, you can try a Callisto application. If the dodder is mainly attached to cranberry, Callisto will probably not give you the control you are looking for. If you would like to try the hand-held flame torches for dodder control (they work well but take time to treat), call Katie at x43 to see if ours are available for loan. The open flame torch can be purchased locally (e.g., Home Depot), for about $50. The infrared models are more expensive and must be ordered over the internet. There are pros and cons to each type and we can talk to you about that, if you are interested.

Ocean Spray fresh fruit export growers cannot apply chlorothalonil (Bravo) after July 15. All other types of delivery to OS can receive chlorothalonil applications up to July 25. Folks delivering to Decas/Clement Pappas cannot use chlorothalonil after July 25. For OS export processed, no Sevin use after August 1 and there is a 40-day PHI for OS domestic processed. For Decas, no use of Sevin after 8/1 and no use of Sevin after July 25 for CP. Always double check with your handler if you have any questions about pesticide use and cut-off dates. QuinStar and Poast have 60-day PHIs, so this may be getting close if you are harvesting early September.

We will be having a bogside workshop on Wed. July 23rd at the station 10:30-noon and one contact hour will be offered.

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IPM Message: June 27, 2014

You may need to be checking early varieties and hybrid varieties soon for %out-of-bloom (%oob). It is always good to get 2 %oob counts BEFORE you hit 50%, just to improve your estimate. Some growers may be spraying for fruitworm control by the end of next week. Late water Howes are very behind. It is too late to be spraying for weevil (unless you have LW Howes). Honeybees should be out there working as the weather has been very nice. Bloom time fertilizer applications can go out now. Be careful if hot weather comes if you are using adjuvants in your mixes. This is especially true for crop oil concentrates. Indar and Abound combinations are good for second fruit rot sprays but remember the 2-week holding time for Abound.

People have been asking about the mix for Poison ivy control. Use 1.5 oz Poast, 1 oz or less Callisto and 1.5 oz Crop oil per gallon water. People have had good success with a tsp of Callisto per gallon (similar to the 4 oz rate) though the usage was much earlier in the season. Select cannot be used between hook and fruit set.

We are planning an "Issues of the Day" workshop for July 23 10:30-noon under the oak at the Cranberry Station. We will be applying for 1 contact hour for the workshop. Bring your samples and question. Come meet our new pathologist, Erika Saalau.

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IPM Message: June 17, 2014

We have had reports of spag and green spanworm flying in the past week.  Many growers are applying first fungicide (or second fungicides on very early varieties). Try to actually do an “in bloom” count to properly time your first fungicide. If you are applying Select or Select Max, please note that you cannot apply the herbicide between hook and fruit set.

We held our clinic on scales. Please see the fact sheet on scales in the June 5 newsletter  If you think you have scale, please call the Ent Lab, ext 20 or just bring in a sample for ID.

Bumble bees will be arriving at the Station on June 19.  Contact Marty at x20 for more information.

Unfortunately, the product for which we did secure the 2ee for moss control does not seem to work as well as a product (not currently registered); both the same active ingredient. We will continue to pursue alternatives for moss control.

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IPM message: June 5, 2014

Pheromone traps should be out by now. Place them on the upwind side of the bog so that the scent flows onto your bogs with the prevailing winds. BHF larvae are still being picked up but they should be pupating soon. Spag is also still out but at a size where you can see them. People are picking up various spanworms (unk for unknown), some spiny loopers, but mostly fairly thick and long brown and green spanworms. Avaunt is a good choice for these caterpillars. Be sure to be sweeping when the weather is favorable and don't delay. You may miss your window to sweep and then miss the window to treat! Cranberry weevil is also out in numbers above thresholds.

We will be holding a clinic on Scale, a new insect problem on many bogs. It will be held here at the Station on Monday, June 16, from 4-6 pm in the library. We will be applying for 1 contact hour, perhaps 2, for the clinic. Please see the fact sheet on scales in the June 5 newsletter:

Bumble bees will be arriving at the Station on June 19. Contact Marty at x20 for more information.

We have heard good results for poison ivy control using the recommended label rates of Callisto and Poast (0.8 tsp and 2 oz/gal, respectively) + NIS.  This is less Callisto and a bit more Poast than what we have used in our demonstration trials. Early treatments (mid-May) seem effective.  We are pursuing a 2ee for the use of a product to control moss and will keep you posted on the progress.

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IPM message: May 22, 2014

Scale is showing up more frequently on bogs this spring. Click here for a PDF on what we have been seeing thus far.

Clean Sweep reports they are finding more Gypsy moth larvae than usual in the 2nd and 3rd instar. Some bogs are close to threshold of 4.5. They are picking up a few fireworm but not as many as in years past (except on Nantucket). Winter moth counts are similar to what we have seen. Their highest average was 11.5. They report finding yellow-headed fireworm on a non-flooded (winter) bog.

Dodder is up and growing vigorously on a bog that has a historically bad infestation. Dodder was wrapping and most likely attaching to cranberry stems already. Dodder was 2-4 inches long.

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IPM Message: May 6, 2014

Newly emerged dodder seedlings were found in Carver over the weekend. They were abot 1" long. Folks will be applying herbicides to control dodder seedlings in the next 7-14 days depending on weather, history of infestation, and experience of control. Consider using 2 applications of Casoron if you can afford it and if your problem is severe enough. Allow 2-3 weeks between applications. Growers have used two 30 lb applications with no reported injury but I do not know how two 40 lb applications would be on vine health. If your vines are compromised from other issues, putting a lot of Casoron on top of them will only increase your chances of injury.

Late Water
If your LW flood is gone, your buds will need protecting at 29.5. Currently, buds are between budswell and cabbagehead. EB and H are at 22, ST is at 25 and BL are at 27.

Scouting Reports
A number of scouts have reported very low numbers of winter moth larvae this past week. Larvae are definitely chowing away in the blueberries. Cranberry weevil has been picked up in very low numbers. You should plan to start scouting next week.

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IPM Message: April 29, 2014

The Entomology Lab reports: With the warmer weather coming along, winter moth (WM) larvae have been picked up in sweeps in Cranberry land! A grower reported average counts of 10 with a high of 17 larvae.  Larvae measured at 1/16 of an inch (see photo below). 

Consider treating with Intrepid, Avaunt or Delegate given that larvae can be found; they will only grow bigger by eating the tiny buds!  Although the numbers may be below threshold, they will get into buds and may be harder to kill once inside.  The threshold of 18 per sweep set is not a long-standing “tested” number; it is a guideline to help management.  Consider only treating pieces where the higher numbers are found and perhaps at reduced rates of insecticide, and then sweep again.  Possibly, the larvae are from the bog and a spray would stop them, but it is also possible larvae may come in from surrounding blueberries and trees and may continue “ballooning” in, and maybe both.  Another consideration is size of cranberry bud… if the buds are too small, larvae may just die, if buds are bigger (i.e., sanded pieces, early varieties, warm locations) larvae may do well and grow faster.
WM larvae are definitely out in blueberry.  Larry Dapsis, who works at Barnstable County Extension, has been monitoring blueberries for WM and has found larvae in blueberry buds in Falmouth, Barnstable, Dennis and Wareham.  Russ Norton, Extension Specialist with Barnstable County, also found larvae in apples in Sandwich last week on 4/24.  He scouted organic blueberry in Middleboro on Monday 4/28 and also found larvae in the buds.

Note good spray window Friday through Monday, with a possible frost Monday night.

Photo courtesy S. Garretson

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IPM Message: April 22, 2014

Frost Tolerance
Early Blacks, Stevens, and Ben Lear are at 20 degrees frost tolerance; Howes are at 18 as of today.
The window for putting on late water floods has closed unless your bog is in a particularly cool location and the buds are still tight and red.

Winter Moth
Growing degree days (GDD) needed for Winter Moth (WM) eggs to hatch is believed to be 177-239. Here are the GDD for locations around SE Mass, as of today:
Wareham = 207
Barnstable = 200.5
Plymouth= 222.5
Freetown= 240
Norton= 283.5

So, all areas are within the temperature accrual range of when eggs might be hatching. The timing of control sprays is important because if the newly hatched caterpillars are allowed to crawl inside the expanding buds, they are protected from any insecticide that might be applied.   Scouting should be started early (ca. May 1) to catch these populations. Populations may re-occur as larvae can balloon in. Avaunt, Delegate, and Intrepid are the best choices for control of WM on cranberry.  If you have a history of WM, you may need to apply a prophylactic spray early in the season.  The Action Threshold for WM is 18 average per sweep set.

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IPM Message: April 8, 2014

Winter Moth update: Please click here for link to this IPM message.





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