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IPM Message 2007

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August 10

Monika Shuler of Clean Sweep reported the presence of 3rd generation BHF. The observation was on Nantucket on pieces where earlier applications to control BHF did not provide adequate coverage. Third generation BHF can occur, so be on the lookout for the small larvae.

The Ent lab mentioned that they have seen high levels of CFW damage in Ben Lear beds. It is hard to pinpoint exactly why this has occurred, but certainly highlights the importance of correct timing of CFW sprays, especially the first spray. CFW females are out there just waiting for the appropriate fruits in which to lay their eggs and they will dump the majority of them in a very short time period. It is possible that the fruit sizing properties (sizing up quickly) of BL fruit lend themselves to create a smaller window of opportunity in which to get that first spray out. SpinTor is the best choice at this point for CFW management.

Flea beetles are out there and insecticides are available to control them (Sevin and Diazinon are recommended at this time, along with Actara). We have not heard of many reports of damaging Spag populations.

CCCGA Annual Summer Meeting will be held at the Station on Tuesday Aug. 21.

August 1

Avaunt has finally received a full registration for use in cranberries. This will be most relevant for your 2008 management of cranberry weevil. Avaunt is an excellent alternative to Lorsban and Diazinon. Avaunt can be used against spring generations of cranberry weevil. It is NOT lableled for summer applications as it is not effective. It is labeled and works against black-headed fireworm and spanworms. It will also affect cutworms if they are present on the bed. It is NOT a good tool for CFW or Spag. Avaunt cannot be used on flow-through bogs and water must be held 1 days following application. The REI is 12 hr and the PHI is 30 days. Avaunt works against the proper functioning of the insect nerve and must be ingested for greatest effectiveness. Good coverage is key. It is toxic to pollinators exposed to direct application but it said to have low impact on honeybees once the spray has dried.

Irrigation continues to be key as we head into another hot spell. It is always better to keep your plants well watered all the way along rather than trying to stretch the intervals and then play catch up. The water demands of the fruit are high this time of year.

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.

July 26

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. Annie also notes that Spag larvae should be showing up and damage may also be seen. Oriental beetle is still flying and cranberry weevil has slowed up.

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.

For those of you that need contact hours or have an interest in pollinators, you may consider attending the workshop sponspored by CCCGA and the Cranberry Station. Thursday Aug. 2 from 1-4 at Federal Furnace. You must RSVP to Patti Silvia at 508-759-1041 x17 as space is limited.

July 19

Spag trap counts are down substantially this week, but feeding damage is becoming evident. Clean Sweep reported that southern red mite infestations have been observed more often this year than in several years past. Take care to control these populations before the leaves become severely affected and turn bronze. Bee activity has been good this season and no major complaints so far. Some growers have been spraying for cranberry weevil, second generation. A little bit of flea beetle activity was seen this week, but high numbers were not the norm. Cranberry fruitworm damage seems low so far.

Certainly, the weather is always an issue with very hot humid followed by hot dry 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.

For those of you that need contact hours or have an interest in pollinators, you may consider attending the workshop sponspored by CCCGA and the Cranberry Station. Thursday Aug. 2 from 1-4 at Federal Furnace. You must RSVP to Patti Silvia at 508-759-1041 x17 as space is limited.

July 13

We cannot stress enough the importance of correct timing of CFW sprays. At a recent bogside workshop, Anne Averill spoke about using the IPM guidelines for timing your sprays. Please see pages 14-15 in the 2007 Chart Book for exact details. Although there have been reports of weevils and BHF problems, it seems like a relatively un-buggy year on the whole.

Applications of Admire can be used for control of soil insects once the bees are out. Admire is not compatible with bees. The Entomology lab is looking for sites with flea beetle, so if you have some beetles out there, please call them (before you spray) at ext. 20. Sevin offers good control of flea beetle.

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 around and if the weather is hot (as it has been). You will cause injury to the flowers.

Carolyn has had several reports of Yellow Vine Syndrome. Stevens seem particularly susceptible, and then next is Ben Lear. YVS is associated with fluctuating water table issues; either it is too wet or too dry. Casoron use seems to exacerbate the syndrome, but is not the cause of it. Consider installing a water level float to help you manage your water levels. These can be purchased at the station for $15. Call Krystal at extension 42 for more information.

July 7

Second generation BHF is out. On Nantucket, trap counts have exceeded 200 moths in a week. Intrepid sprays have worked very well to control BHF. BHF probably peaked last week, around June 30. Spag counts have also been above 200 moths per week, but that is not unusual. The peak for Spag in some locations was probably July 3 or 4. Intrepid and SpinTor are good choices for Spag. Four applications are the maximum allowed for Intrepid. Not many sightings of second generation cranberry weevil. True brown spanworm does not seem to around in many bogs either, at least at levels worth treating.

We are hosting a workshop on water management on July 12, 10 AM-noon. We will be looking at water floats, electronic water sensors and other technologies. The workshop will be held bog side at AD Makepeace Pumping Station Bog. Park at the Tihonet Village Market and follow the signs.

June 28

Monika Shuler reported that second genertion BHF is out and active. She has seen the larvae on Nantucket and Carver. Larvae are 1/8-1/4" long. These are not being picked up in sweep nets, rather the larvae are being noticed in webbed tips. Do not hesitate to control these populations. Some bogs peaked last week for BHF.

Second generation cranberry weevil have also been reported, but not in very high numbers, maybe 6 on average. Remember, Actara is toxic to bees! Actara is a restricted use compound and Zone II restricted. Lorsban is a poor choice for weevil as most populations are resistant. Low populations of brown spanworm were reported. SpinTor or Confirm can be good choices for brown spanworm. Remember, brown spanworm infestations can be quite patchy. Look for signs of damage to the uprights.

Dates for CFW sprays have already been set for this weekend for some Stevens and Ben Lear pieces. See the Chart Book, page 15 for details on how to calculate % oob. Timing of the first spray is critical. Spray 3-5 days after 50% oob for Stevens, 5-7 days for Ben Lear and 7-9 days for Early Black and Howes. If using diazinon, please check your label to determine the maximum number of applications allowed for the specific product you are using.

For Spag, pieces that were treated with SpinTor for first generation seem to have lower trap counts than bogs that were not treated.

Bloom is looking good and moving along at about 5-7% per day. Kerb cannot be applied after June 30.

June 18

Bloom is coming on in many places especially inland. Many first fungicides are going out this week. Keep in mind the poor Final Keeping Quality Forecast for this year when planning your fungicide program. Unless your bog has unusually excellent fruit or if you held late water, this is not the year to cut back or reduce fungicide inputs.

Several growers have called asking about potential crop injury with late applications of Kerb. Research only tested crop tolerance through the jewel stage, and no further. We do not have any information on impacts of applications made onto open blossoms. Kerb applications are legal through the end of month. If anyone tried an application when blossoms are present, please let me know your observations.

Keep sweeping through bloom so you can monitor brown spanworm larvae. Keep a lookout for slender brown larvae on the rim of your sweep net. Remember the threshold is 18 per sweep set. Admire can be used to manage striped colaspis and grubs. Admire cannot be applied during bloom as it is toxic to bees; it is best to wait until afterwards to spray. Recommendations are to spray within 1-2 weeks after seeing peak flight. Adults can be picked up in your sweep net. Cranberry fruitworm moths have been flying since last week. Moths are just waiting to lay eggs, so be ready as soon as fruits start to form. Confirm and SpinTor are not good choices for CFW. Intrepid could be used but only with low gallonage, efficient systems.

If you are in a Zone 2 and you must use something other than Intrepid for BHF. BHF eggs hatch within in 3-10 days of laying. Act accordingly; don't delay. Intrepid is a good choice in other situations. Use a sticker with Intrepid as per the label.

Monika Shuler reported Spag larvae seem very uniform, large and mature. Perhaps this might synchronize flight and egg laying. Moth flight has started. She also reported BHF moth counts exceeding 80 in one week. Sprays 8-10 days later may help to minimize injury from these early high counts, even if counts haven't peaked. Cutworms and weevil activity are down.

June 8

Thanks for Monika Shuler of Clean Sweep Consulting for the following scouting information. First generation Spag have been seen in counts around 3-4 per sweep set over the last week. Spintor is a good choice for control. Cranberry weevil larvae have been picked up in pods. Open up newly set flower pods and you will likely see the grubs inside. It may be worth waiting for a while after a significant rain to allow spanworms to make their way back up into the canopy. Spanworms have been very variable in size and some outbreaks have been noted. Gypsy moths that were not controlled have caused serious damage in patches on bogs. Recent sweeps have picked up a few of the true brown spanworm; moths were seen flying last week. The Pittsville Looper (or great cranberry spanworm) has also been swept. Intrepid seems to do a good job on these caterpillars. Only a couple of spots with mites have been seen and good control was had with Nextar. Be sure you correctly ID the mites in the net and don't mistake aphids or other mites for Southern red mite. Mites can be spread on contaminated sweep nets or shoes, so clean up or use clean nets when going to a clean bog.

Traps for BHF and Spag should be up by now. BHF moths will fly soon and produce the second generation that will feed during bloom. Actara is the only choice for cb weevil that are Lorsban-resistant. Avaunt is NOT available for spring use and the label has not been approved by EPA as of yet (Anne Averill and Marty Sylvia).




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