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IPM Message 2008

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August 15

Many growers will be discontinuing inspection of fruit for cranberry fruitworm this week, if they have not already done so. CB weevil is off the bog. Flea beetle may still be out as well as Spag. In general, cranberry fruitworm pressure seems low. Flea beetles are out there. Applications of Sevin for fruitworm are keeping flea beetle in check.

Even with the large amounts of rain that we have been receiving, there is no recommendation for additional fungicide sprays. The weather has been very cooperative and our rain events have been followed by at least a day or 2 of sunshine. There is really no need to apply an additional fungicide for fruit rot protection as this point even if we get more (and frequent) rain events.

Now is the time to be putting out bud set fertilizer applications if that is part of your program. Just to reiterate, Callisto cannot be chemigated onto any cranberry bed, producing or nonproducing. Observe its 45-day PHI. The CCCGA Annual meeting is scheduled for Tuesday August 19 at Makepeace's Tihonet Market.

This will be the final message for the 2008 season. Thank you for coming to the web page for the IPM Message.

August 4
Another note on Callisto. Please be sure to wear the proper PPE when making applications of the herbicide. You should have long-sleeved shirt, pants, socks and shoes and hand protection. If you are using Stinger for wild bean control or other sensitive weeds, use the lowest effective dose. Wild bean, in particular, is very sensitive to Stinger. When you use the lowest effective dose, the chances of causing vine injury are also reduced. If there are no vines in the infested area, you can use a higher amount. With severe infestations, you will likely have to treat again next year anyway. Remember, Stinger has a 50-day PHI and Poast has a 60-day PHI.

If you plan to do tissue test, collect your samples from mid-August through mid-September. You can get your samples analyzed locally or send them off to UMass for analysis. Samples should contain no more than the top 2 inches of growth (no roots, soil, runners, or fruit). Collect tissue from vegetative and flowering uprights. You typically need about 1 cup of vine tissue. Do not collect samples when the vines are wet and do not send the samples in plastic ziploc bags. Always request nitrogen determinations when you submit your samples.

The 2008 CCCGA Summer meeting will be held at AD Makepeace Tihonet Market/Farm area on Tuesday August 19. Contact the CCCGA for more information. There will be one more IPM message posted by the end of the month before we suspend for the scouting season.

July 25

Some folks are reporting yellowed or whitened tips after applications of Callisto. This has been seen in WI and the Pacific Northwest. Kim Patten from Washington reports that Callisto yellows tips when they are sprayed after they have slowed their growth. Sometimes it can look rather bad; other times, not so bad. If the symptoms show early in the season, vines seem to grow out of it. Later in the season, it seems to persist. In WA and WI, they have not seen an effect on return bloom or yield to date. The consensus (as such) is that the discoloration is worth the weed control. Please continue to advise me on your experiences with this.

Please DO NOT CHEMIGATE Callisto; it is illegal to do so. You could lose your applicator's license and jeopardize the use of the compound for the industry.

Things are still pretty quiet on the insect front. CFW can lay another batch of eggs around the end of July, so it is important to keep scouting fruit for viable, unhatched eggs. Delegate is a good choice for Spag and CFW. Entomology Lab anticipates Spag to be on the rise soon. The window is closing to treat for weevil. Applications of Ridomil or Aliette should go out 60-90 days after the first, but 45 days prior to harvest. Ridomil must be watered in after application, usually about 3 hr is good as too much water will pass it through the root zone.

July 17

Fruitworm sprays are going out, but probably getting towards the end of the 2nd spray period. Anne Averill discuss the IPM guidelines for timing your sprays. Please see pages 14-15 in the 2008 Chart Book for exact details. Overall, insect pressure seems to be low this year. The Entomology lab reports low cranberry fruitworm pressure and fairly low Spag trap counts. Grub reports are starting to come in. Use traps to monitor beetle flight (by early July). Apply Admire 3 weeks after peak flight (or slightly earlier). Irrigate before and after application, but do not saturate the soil. Two applications are permitted but 1 application at the higher end rate is recommended. CB weevil pressure also seems low.

I have gotten reports from two growers who combined Poast and Callisto with very good results and no indication of vine injury. We still have time, but Callisto does have a 45-day PHI, so keep that in mind. Please remember; it is ILLEGAL to chemigate Callisto. Poast, a selective grass herbicide, also cannot be chemigated. Bear in mind, Poast has a 60-day PHI. If you have used Callisto against dodder, I would be interested to hear your experiences. Please email or call.

We are hosting a workshop on mowing and irrigation innovation on July 23, 10 AM-noon. The workshop will be held bog side at Gary Garretson's in Rochester. Directions.

July 7

Many growers are putting out fruitworm sprays. The biggest issue thus far is the 5-day REI with the new Diazinon label. Please read the label of the product you are using. You must abide by the label. If you still have product with a 24-hr REI, that is what you can use. Otherwise, most product out there is 5 days. Workers can enter the area within the 5 days if they have the proper PPE (personal protection equipment).

Certainly, the weather has also been a concern with very hot humid conditions. It is important to keep your vines well watered all the way along (and thus prior to the onset of very taxing periods of evapotranspiration). The water demand of the plant during this time of year is the highest compared to other times during the growing season. The "1 inch per week" rule will not suffice here; vines probably need closer to 2" per week during fruit set.

Poast can still be applied for control of grasses but it has a 60-day PHI and cannot be chemigated. You can apply it aerially or as a spot-treatment. Since crop oil concentrate is added with Poast, be very careful if blooms are still around and if the weather is hot (as it has been). You will cause injury to the flowers.

We are hosting a workshop on mowing and irrigation innovation on July 23, 10 AM-noon. The workshop will be held bog side at Gary Garretson's in Rochester. Directions.

June 30
Feedback on Callisto use. Growers have been using Callisto during bloom and have not reported any ill effects. Please let me know if you see damage. Most growers have reported effects on many species of weeds including hardhack, willows, maples, and wild bean. We also applied Callisto during the hot spell in early June and have not seen any vine injury.

Callisto can only be applied by ground equipment; Chemigation and aerial applications are NOT permitted!! Boom sprayers, mist blowers, and hand held pump sprayers are examples of proper applicators.

Callisto works as a growth regulator. Once the weed has flowered, it will put less resources into new growth and you may see a loss of efficacy. Also, stressed weeds will not be affected by the herbicide as much as healthy well-watered weeds.

June 16

I will be out of the office until June 30 and will be unable to update the IPM message until I return. I apologzie for any inconvenience.

June 12

Pheromone traps for Spag, BHF and cranberry girdler should be up by now. They should be on the upwind side of the bog so that the scent travels across your bog. Monitor weekly and change the traps as needed. Replace the lure every 3-4 weeks.

Clean Sweep reports counts of 3 to 4 Spag larvae showing up in sweep nets, so pressure is out there. CB weevil counts have not been horrible, but we have heard of counts >10 per set. Avaunt is working well against weevil and BHF; Avaunt will not work against Spag. Use Intrepid or Delegate for Spag control. Although not listed for control of cutworms, Monika reported seeing an impact on cutworm populations with Avaunt.

BHF moth counts seem low. The highest reported by Clean Sweep was 22 in a trap last week. A few brownspan moths have been seen and one larva was picked up in a sweep net. As bloom approaches, keep a look out for brown spanworm larvae.

Dodder is starting to show up in several places and would be expected to really start expanding over the next few weeks. Bloom seems slow for the most part, since May was cool and then the heat blast June7-11 probably slowed things up. Early scattered bloom for many locations will likely be early next week. One hot location in Lakeville (with Ben Lear) was at 10-20% bloom this week, but that is certainly an outlier.

Many growers have been applying Callisto. As we head into bloom, be very careful if you are using crop oil concentrate and blossoms can be very sensitive to this additive. Syngenta projected that Callisto should be ok to apply to cranberry vines in the heat, as long as the plants are not stressed. Stressed plants will not metabolize the herbicide and injury may occur. They also clarified that Callisto is rainfast in 4 hours. We are not quite sure how the "48-hr dry period" language showed up on the label (leftover from Section 18 precautions, most likely), but as long as you have 4 hours rain-free (or no irrigation) after application, the material should be well absorbed into the weeds.

June 6

The workshop on Callisto raised many questions about using this new herbicide. My biggest comment would be that if you are unsure about how the product will affect cranberries (especially new tender growth), try it on a SMALL area before treating a large area. Wait about a week to see if any injury shows up. We have not tried Callisto on tender growth from new plantings or recently mowed bogs. Since cranberries are very tolerant of Callisto, applications should be okay, but we have no field data to back that up, so be careful! I would exercise caution in applying the material around bloom if you are using a crop oil concentrate. Be wary of warm conditions when using COC during bloom. These tissues are sensitive.

Questions also came up about using Poast mixed with Callisto. I talked with Syngenta and they feel this should be ok with cranberries. However, since we have NO experience with this combination, I recommend trying it on a small area before treating large acreage. Syngenta reports damage on corn with Callisto and EC type herbicides, hence, the warning.

Please send me feedback on your experiences with Callisto. Thanks.

June 2

Things are apparently heating up and more insects are emerging. Clean Sweep reported counts of cranberry weevil at 12+ late last week. Pyramid worm is also showing up in sweeps. Green spanworm counts have been in the mid-teens on many bogs. Spag is emerging so keep a lookout for small larvae.

The Callisto workshop will be tomorrow, starting at 8:15. Two contact hours will be offered.

May 27

Monika Shuler of Clean Sweep will be providing information on scouting in the area. Insect pressure seem low this week, though there have been a few sites where cranberry weevil and blossomworm were over threshold. Weevil numbers were not high (about 6-7 per sweep) and blossomworm numbers were about 11-12. Spag are emerging and low counts of black-headed fireworm have been picked up.

The striking news continues to be the long string of frost nights that have occurred in May. Low temperatures and low dewpoints have caused many growers to start running for frost protection early in the night and in many cases, growers have run their systems for 8 hr or more. Hopefully, warmer temperatures will come and folks can get some rest.

A workshop to discuss Callisto will be held on Tuesday at the Station from 8:15 to 10 AM. Rain date is June 4.



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